tag:blogger.com,1999:blog-35333454636954311922012-01-25T11:40:08.533-05:00NASA's Modern Era Retrospective-analysis for Research and ApplicationsMichael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.comBlogger1151100tag:blogger.com,1999:blog-3533345463695431192.post-88160108778787397652012-01-25T11:35:00.002-05:002012-01-25T11:40:08.547-05:00

Travel support applications for the 4th International Conference on Reanalyses are due Jan 27. Interested students and early career scientists should visit http://icr4.org/support.html for more information.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-15308118880847746652012-01-10T17:27:00.001-05:002012-01-10T17:29:23.187-05:00

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Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-38269384377564953342011-08-04T09:53:00.004-04:002011-08-29T16:46:22.236-04:00

The 4th WCRP International Conference on Reanalysis is scheduled for May 7-11, 2012, just outside Washington DC, on the Metro Line in Silver Spring MD. At this time, Registration and Abstract submission forms are under development, but should be available soon. For details on the objectives of the conference and agenda, please visit: http://icr4.org

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-73338422354810637732011-08-01T13:51:00.003-04:002011-08-01T14:00:43.294-04:00

TRMM TMI rainfall data updated to version seven, which included a format change (starting July 1). MERRA data production was put on hold while the data ingest of version 7 was updated. This was only a short delay. Current tests indicate no anomalous behavior in the time series that can be attributed to this change. June 2011 data should be online within a few days, and July production and

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-65837845190733535562011-06-03T14:27:00.002-04:002011-06-03T15:49:39.172-04:00

Following the USCLIVAR Reanalysis workshop (Nov 2010, Baltimore MD), a short summary of the proceedings and recommendations was developed. It was published in AGU EOS last week.The aim of the workshop was to bring together separate disciplines working on data assimilation and reanalysis in separate disciplines, to discuss the needs for and direction to integrated Earth system analysis (IESA). The

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-72697130757648389622011-05-20T14:30:00.007-04:002011-05-20T15:41:25.757-04:00

During last April, record or near-record precipitation occurred across a large section of the United States (from the Midwest through the Ohio Valley). This rain, and likely snow melt from the Northern Great Plains, are contributing to the current prolonged and severe flooding along the Mississippi River and its delta. In addition, a prolonged drought of varying degrees persists across the Gulf

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com1tag:blogger.com,1999:blog-3533345463695431192.post-74916360074717318262011-05-16T11:41:00.005-04:002011-05-16T12:07:31.818-04:00

Recently a question about some regional climate data came in, it needed to be independently checked. It seemed like a good opportunity to make use of the Giovanni portal into the MERRA data. Many of the MERRA data collections are available to Giovanni, even 2D one hourly data. MERRA data is directly linked through the Giovanni page, but also from the MERRA data holdings page, which may be more

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-59584627138664857572011-04-14T11:39:00.003-04:002011-04-14T11:43:49.124-04:00

Papers are now available at the AMS Online Journals MERRA Special Collection. The MERRA Overview by Rienecker et al. should be considered as the fundamental citation for the MERRA project and data set.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-67229239378181553382011-02-17T19:01:00.004-05:002011-02-17T20:04:12.980-05:00

There have been numerous discussions in meetings over the last year or so regarding the multitude of new reanalyses available. These have been generally concerned with users time and effort in deciding which reanalysis best suits any particular users needs. This is mostly true, though some features of reanalyses are equally well represented. The utility of reanalyses is very broad, and has been

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-59588677988810293562011-02-03T10:00:00.004-05:002011-02-03T10:22:42.516-05:00

With the holidays, travel and deadlines it has been difficult to put together regular snippets of interesting results. The hope was to summarize the papers coming out but there are quite a few and a lot of useful information. I hope to get back to that in the coming weeks.In the mean time, it is important to share the information in a timely fashion, and the speed that the internet and electronic

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-70241346979153636762010-10-29T09:52:00.003-04:002010-10-29T15:16:24.738-04:00

Earlier this year, a compiler was upgraded on our supercomputing platform. This upgrade has apparently introduced a problem into the post processing program that compresses and prepares data files for transfer to the DISC where the data are publicly accessible. So that: all MERRA data after data date June 1, 2010 will be replaced and is currently no longer accessible at the DISC. This includes

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-18106239257716594172010-10-08T11:48:00.003-04:002010-10-08T11:54:43.267-04:00

The MERRA Climate Atlas http://gmao.gsfc.nasa.gov/ref/merra/atlas/ has been opened and linked from the homepage. Numerous figures compare MERRA with previous and current reanalyses as well as global observation data when available. As is mentioned in the Introduction, new figures and comparisons are still planned. Comments and suggestions on the Atlas content are welcome.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-86056154309636980212010-10-05T09:06:00.003-04:002010-10-14T14:32:20.980-04:00

Most of the MERRA analysis and results that have come along are intended for publication but not yet submitted. So, we are holding off posting them here until peer reviews are in. Quite a few are going to a special collection at the Journal of Climate (Deadline Oct 30). In addition, between the upcoming IESA workshop in Baltimore (Nov 1-3), AGU Fall Meeting and AMS Annual Meeting, there are a lot

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-2906738828431651692010-09-09T12:06:00.004-04:002010-09-10T11:05:28.289-04:00

Evaluation of Reanalyses - Developing an Integrated Earth System Analysis (IESA) Capability November 1-3, 2010, Sheraton Hotel, Baltimore, Maryland (Inner Harbor)NOTE: The government perdiem rate in Baltimore has dropped to $144 for FY2011. If you have already made a reservation ,your room rate will be adjusted accordingly. If you have any questions or problems reserving at the new rate, you can

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-38832706522878746362010-08-18T12:18:00.001-04:002010-08-18T12:21:44.184-04:00

Note that Travel Support and deadlines have been included:Evaluation of Reanalyses - Developing an Integrated Earth System Analysis (IESA) CapabilityNovember 1-3, 2010,Sheraton Hotel, Baltimore, Maryland (Inner Harbor)Online registration available - abstract deadline 10 September 2010Sponsors: NOAA, NASA, NSF, and U.S. CLIVARWorkshop objectives: *Assess strengths and limitations of the new

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-38240227221421415812010-08-02T10:15:00.003-04:002010-08-02T11:53:03.735-04:00

Please consider presenting at or attending session A20 "Progress and Uncertainty in Reanalysis Datasets" at the AGU 2010 Fall Meeting , 13-17 December 2010, San Francisco, California, USA.By synthesizing observations from various conventional and satellite observing systems, reanalysis datasets provide comprehensive long-term descriptions of the climate system that are used in numerous researches

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-20211207061720914482010-08-02T10:07:00.003-04:002010-08-02T10:15:25.305-04:00

Sincere apologies for the lack of postings on new results. We are pushing forward with quite a few papers on MERRA, and they are nearly ready for peer review submission. Most of what has been published here before was either accepted, or some straight forward analysis that would likely not be submitted. As the peer reviews come in and these manuscripts get accepted, more results will be shared

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-78680838593527967492010-07-15T09:30:00.006-04:002010-07-15T09:40:04.822-04:00

For long term climate applications, 20CR should be a good option. Hopefully we will compare and contrast with MERRA soon. Here is the latest status from 20CR:14 July 2010 Dear Colleagues, Global four-times-daily atmospheric and surface fields spanning 1871 to 2008 from the Twentieth Century Reanalysis Project version 2 dataset are now available. They can be obtained in GRIB format via our

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-34884684179830813822010-06-23T14:18:00.003-04:002010-06-23T14:36:13.471-04:00

Within the last year or so, and in addition to the availability of MERRA data, ECMWF Interim, NCEP CFSR and NOAA 20CR have made data available. Each system has its own strengths and weaknesses. USCLIVAR has initiated a workshop this year. One of the foci is to evaluate these new reanalyses in a climate sense, but also to determine what is needed for the integration of Earth system components (

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-2468063068125828832010-06-11T12:20:00.004-04:002010-06-11T12:55:37.312-04:00

The GES DISC has been tracking MERRA downloads, and there are a few interesting occurrences. In the first 5 months of 2010, the average download is 24Tb per month, and the total for 2010 is nearly equal to all of 2009. Since the purpose of the Data Subsetter is to help reduce the volume for faster downloads (and is the most popular method of access), we also look at number of files. On average,

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-16848145183128162932010-06-09T10:05:00.003-04:002010-06-09T11:12:10.713-04:00

Forwarded from Wesely Ebisuzaki:Hi, I wanted the MERRA dataset (HDF/GDS) in grib2 format so g2grb.gswas written.g2grb allows you to write grib2 files from grads.Testers wanted: requirements: latest version of wgrib2 installed know grib2 send results to wesley.ebisuzaki at noaa.govinstructions: http://www.cpc.noaa.gov/products/wesley/g2grb.html Wesley

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-55217606071290750562010-04-28T19:12:00.002-04:002010-04-28T19:39:32.917-04:00

GEO has published an article supporting the reanalyses development and international collaboration and coordination. Reanalyses represent a significant confrontation between the models and observations, and can be used to improve both, and produce a research quality value-added data product. While CFSR, Interim, 20CR and MERRA are all being released about the same time, they were not planned that

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-23688941302233143742010-04-20T16:16:00.005-04:002010-04-21T11:03:31.510-04:00

Aircraft observations are a substantial part of the reanalysis system, especially over the oceans and regions where other high altitude conventional observations are infrequent. So that, the eruption of Eyjafjallajokull volcano will have many effects on reanalyses in general. Increased concentrations of aerosols can effect the remote sensing of atmospheric properties (Mount Pinatubo is the

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-43298756712418942012010-04-20T11:51:00.003-04:002010-04-20T12:06:11.599-04:00

Stream three has finished March 2010, signifying a transition to real time production schedule. Production will lag real time by approximately 3 weeks, allowing collection of all the observations used in the retrospective periods. We are planning one week to review and quality assure each new month's data files, before being sent to the GES DISC. So, Each new month of MERRA data will be available

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-58602162762250038882010-03-17T13:02:00.011-04:002010-03-18T12:37:35.135-04:00

There are a number of presentations that include MERRA data at the Workshop: Surface Fluxes: Challenges for High Latitudes in Boulder CO this week. Given the scarcity of observations at high latitudes and uncertainty in satellite observations, reanalyses may be useful data sets.Michael Brunke, Xubin Zeng,( Uncertainties in global surface flux datasets in high latitudes.) compare various

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-83234299493926937972010-03-11T09:13:00.004-05:002010-03-11T12:39:42.809-05:00

We are updating MERRA data to permit longer spinup of streams 2 and 3. The announcement and how it affects data downloads follows. Data files formally available in the MERRA data streams are being renamed "SPINUP_*" and will also be available for download. Most research and applications for the data will only require use of the "Mainstream" MERRA data.Updating of the MERRA data products site to

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com1tag:blogger.com,1999:blog-3533345463695431192.post-31694779903088637502010-03-02T11:08:00.004-05:002010-03-02T11:42:48.833-05:00

Precipitation is a reasonable metric for evaluating reanalyses, because it is coupled to both the water and energy cycles and will be affected by the heating and water vapor increments, as well as variations in the dynamic response of the system to the data assimilation. Bosilovich et al (2008) evaluated precipitation among reanalyses, and also included results from the MERRA validation

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-30714225687334443092010-02-01T15:31:00.002-05:002010-02-01T15:42:45.861-05:00

Data availability at the DISC now extends for thirty years 1979 through 2008. This data is all online, and open to access. Production is presently in May 2009, and so should catch up to real time around the end of February. MERRA will continue into the future, as long as it is feasible to do so. At this point, we do not have a set production terminus.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com2tag:blogger.com,1999:blog-3533345463695431192.post-90701718455903361352010-01-29T16:37:00.003-05:002010-01-29T16:52:15.513-05:00

Recognizing the importance of the Arctic region, as well as the tremendous amount of field work and supporting data sets, the Arctic System Reanalysis will perform a high resolution limited domain reanalysis for the Arctic. Recently, there was a Call for Community Involvement (unfortunately AGU member can only download this), printed in EOS (v 91, #2, 12 Jan 2010) looking for supplemental data

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-84593207478422472852010-01-27T09:51:00.005-05:002010-01-27T12:27:39.698-05:00

Some questions have come in regarding differences between MERRA and other reanalysis at pressure 1000mb and 850mb pressure levels. It is very important to note that MERRA does not extrapolate pressure level data vertically greater than the surface pressure. The result is that there is undefined data points in much of the 1000mb fields. This will affect the representativeness of both time and area

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-75291709775313053032010-01-15T09:38:00.002-05:002010-01-15T09:43:22.231-05:00

Some News which may interest those who read these pages:On 1/14/2010 6:16 PM, Suranjana.Saha@noaa.gov wrote:> Dear Colleagues>> I am happy to inform you that the CFS Reanalysis is now complete for 31> years (1979-2009) and the paper has just been submitted to BAMS.>> You can download it at the CFS website at:>> http://cfs.ncep.noaa.gov>> The first set of CFSR data will be made available to the

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-42908013615332245512010-01-13T13:17:00.003-05:002010-01-13T13:25:39.655-05:00

31DEC2008 has just been produced by the reanalysis system. This extends the MERRA Mainstream to 30 Years. 2008 is still being checked for quality, but should be posted online at the MDISC within a week or so.At approximately 1 year per six weeks, 2009 should be produced by the end of February. MERRA production will make a transition then, where we expect data to be released monthly. The

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-61861413710526159562010-01-08T15:24:00.004-05:002010-01-08T15:47:02.713-05:00

Hydrologic anomalies can be persistent leading to extreme regional conditions. Much has been written on the 1993 flood in the central United States. The soil was saturated at the start of the summer becasue of above normal spring precipitation. During June, several strong synoptic scale events brought continued wet conditions. During July at the center of the flooding rains, convective events

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-30701703202735758922009-12-24T10:59:00.004-05:002009-12-24T11:29:09.407-05:00

The original plan for MERRA production was to run in three streams, optimizing the computers processes. The original three streams were 1) 1979-1988, 2) 1989-1997 and 3) 1998-present. These were initialized with 2 years of coarse resolution analysis, followed by 1 year at the native (1/2 degree) resolution. Recently, streams 1 and 2 caught up to the beginning of the respective subsequent streams,

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-1729279099767871522009-12-16T16:26:00.005-05:002009-12-17T10:40:28.910-05:00

This week, I needed a daily average surface flux subset of MERRA data. Locally, we have the 1 hourly data on a mass store system, but that is primarily archive, and not best used for routine analysis. The source data files are 269Mb each, and I needed one for each day from July 1987 through Dec 2007, which would have been a 2TB request. So, I used the MDISC to create data files specifically for

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-15038914586104575122009-12-04T15:57:00.005-05:002009-12-04T16:29:04.516-05:00

An early decision in producing MERRA was to release data to the science community before the completion of the full time series, in the hopes that early analysis would provide insight to the data in a timely manner. In this months Journal of Climate, Dessler and Wong evaluate the water vapor feedback in the climate system using AR5 models, ERA40 and MERRA. The models and reanalyses all show

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-27005580356292973762009-11-13T16:35:00.003-05:002009-11-13T16:45:59.208-05:00

There was some scheduled downtime this week, and that slowed production, but December 2007 will be complete sometime this evening. 2007 data files are undergoing evaluation and should be released to the DISC next week, with 29 years of data available online.Production on the first two streams continued an extra two years of data, giving three years of overlapping analyses for 1989-1991 and 1998-

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com2tag:blogger.com,1999:blog-3533345463695431192.post-78475979034107763642009-11-06T09:24:00.007-05:002009-11-06T15:34:26.315-05:00

In looking at some land hydrology in the southern US, a question came up on the effect of the 2005 hurricane season on the hydrology time series. So, we started looking around at the evolution of Katrina. This animation shows the MERRA version of Katrina (13Mb gif) moving over the southern tip of Florida and through the Gulf of Mexico. The colors show precipitation in mm/day and the white

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-85303089802765407812009-10-20T09:09:00.005-04:002009-10-20T10:06:41.893-04:00

In a recent paper, Bosilovich et al. (2009) evaluate 8 operational analyses to better assess the uncertainty of the physical fields (not the assimilated states) derived form (re)analysis systems. During the first phase of the Coordinated Enhanced Observing Period (CEOP) 8 international meteorological analyses were collected for a common period, along with supporting satellite and in situ

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-66630735032699349062009-10-13T09:55:00.006-04:002009-10-13T11:00:56.334-04:00

Data at the download site are now continuous from 1979 through December 2006. To date, the data volume is approaching 70Tb, and in September alone, 5.7 million files totaling 91Tb of data were served.Production continues toward real time, and June 2007 is halfway complete. The throughput is approximately 1 year every 6 weeks, so the production should catch up to real time in early 2010.An

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-65404936834748206732009-08-05T08:55:00.002-04:002009-08-05T09:01:48.014-04:00

The absttract deadline for the 24th Conference on Hydrology has been extended to Aug 10. Of note, abstracts regarding "Hydrometeorological representation and applications of reanalyses" are sought. The full list of conferences, themes and topics can be found at the AMS WWW page.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-26358295850211309902009-07-28T09:08:00.003-04:002009-07-28T09:14:27.521-04:00

Stream 2 has past the end of Dec 1997 and stream 3 has past the end of Dec 2005, so that we now have a time series from Jan 1979 through Dec 2005. The 1997 and 2005 data are still being assessed for quality, and should be posted at the MDISC site by then of the month or no later than early August.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-31967877811215558672009-07-13T14:30:00.002-04:002009-07-13T14:37:16.918-04:00

Stream 1 has completed Jan 1979 through Dec 1988, catching up to the beginning of Stream 2. The reamining Stream 1 data will be released to the the download site within a week or so. Further, we are conituing Stream 1 for two additional years in order to study the initialization of Stream 2, and evaluate the transition of the data between the two streams.Stream 2 should catch up to the begining

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-60344297643390483112009-06-18T09:52:00.008-04:002009-06-18T12:58:04.683-04:00

MERRA Production has been moving along steadily, still on track for a continuous time teries (1979-2006) to be available in early August. Data (missing 1988, 1997, 2005) is presently available for download, see the MERRA home page for access information.With much of the record available, comparisons to previous studies of reanalyses are possible. For example, there has been a lot of work on the

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-56393985111551215172009-05-22T15:21:00.008-04:002009-05-22T16:32:36.500-04:00

Recently, Midshipman S. Martin from the United States Naval Academy visited the GMAO, to learn about MERRA. The specific case study evaluated for a brief internship was the March 13, 1993 east coast snow storm (links to a recent Capital Gang discussion on the predictability of the storm). This was just a preliminary evaluation of how MERRA analyses represent the storm, in preparation for a senior

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-91187537322811190672009-03-06T15:47:00.006-05:002009-03-10T12:34:43.563-04:00

The eruption of Mt. Pinatubo in June 1991 was the second largest terrestrial eruption of the 20th century (Novaruption in 1912). This eruption ejected massive amounts of aerosols in the stratosphere. While global surface temperature dropped in the subsequent months, this caused an overall warming of the stratosphere in the tropical latitudes by several degrees due to absorption of radiation by

Gary S Partykahttp://www.blogger.com/profile/00370247401246854215noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-30613974951338913242009-02-27T09:19:00.008-05:002009-02-27T17:37:18.304-05:00

The 1979 President's Day snow storm was a significant snow event in the North eastern US. This article presents an interesting review of the impact on the DC region and the modeling capability of the time. With the 30th anniversary of this storm, an animation of the MERRA depiction has been posted on the main WWW page. Here, we just compare a snapshot of the reanalysis to GOES IR imagery. The

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-72876481422138603042009-02-24T09:39:00.003-05:002009-02-24T09:46:00.347-05:00

The presentations from the MERRA Workshop have been posted on line at: http://gmao.gsfc.nasa.gov/research/merra/presentations/index.phpAlso, the materials from the workshop, including documentation and software (Grads, with online access to the data) are also available online:ftp://gmaoftp.gsfc.nasa.gov/pub/papers/mikeb/MERRA_Workshop/

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-87596794920474430072009-01-11T22:15:00.006-05:002009-02-12T09:36:17.249-05:00

Today, January 11, we hosted the short course on MERRA and data access. We had 15 attendees from a variety of backgrounds, research and applications, universities and government. Also, there were a range of experiences, some familiar with reanalyses some no prior experience. Our objective was to provide the basic understanding of the system, how we validate and use the data in research and how to

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-42194222295692432532008-12-20T10:25:00.005-05:002008-12-20T11:33:01.635-05:00

MERRA Stream 2 has completed through 1993. We have been looking at various weather and climate events. Hurricane Andrew was a powerful, but fairly small hurricane. MERRA's 1/2 degree resolution is likely too coarse to adequately resolve the circulation, and there is no bogus or center relocation being done in the system. Still, assimilation of observations will show some circulation or

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-89626997218165139732008-12-04T10:03:00.004-05:002008-12-20T11:43:56.105-05:00

This is a short note to inform you that the first years of data have been opened for access at the Modeling and Assimilation Data and Information Services Center (MDISC). The announcement can be found here: http://gmao.gsfc.nasa.gov/research/merra/data_access.phpInstructions for download and visualization are available at: http://disc.sci.gsfc.nasa.gov/MDISC/Documentation and status of the

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-35768409036816718972008-11-09T07:16:00.010-05:002008-11-10T10:55:03.010-05:00

Last week, MERRA had produced 11 years of data across all 3 streams (79-82, 89-92 and 98-00). Here is a quick evaluation of the global energy budget so far. The reference values are a recent update from Trenberth et al. (2009, BAMS accepted DOI: 10.1175/2008BAMS2634.1). There is a difference between MERRA and this reference, where MERRA is averaging all 11 years, while the reference data was

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-12631059132329234972008-10-17T09:17:00.005-04:002008-10-17T22:03:29.115-04:00

While looking over the area average time series of the Amazon River basin produced by MERRA, a very cold event was apparent in July 1981. Figure 1 shows the time series of 850 mb temperature for the basin, and the event is several K colder than earlier in the reanalysis. The cold event starts around July 16 1981, and lasts a few days. Looking at the observation reports from this period, did not

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-54253821146582162412008-10-10T21:35:00.005-04:002008-10-10T22:55:15.306-04:00

Recently, an evaluation of the global energetics identified an anomalous feature, a bullseye, off the coast of Portugal during most of 1979 and 1980. The anomaly affects many tendencies and variables in this localized region. Figure 1 shows the JJA 1979 Analysis Increments of temperature at 500 mb, the center of the strong negative increment is a persistent radiosonde that appears to be flawed,

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-22924357210606085962008-09-26T21:20:00.002-04:002008-09-26T21:31:05.401-04:00

One of the advantages of reanalyses is that many different sources of observations are combined in a global gridded consistent system. We have a brief overview of MERRA and the challenges facing reanalyses published in the online IEEE magazine Earthzine www.earthzine.org. There are a number of interesting interviews and articles at the site as well.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-56644773185002877582008-09-23T11:28:00.003-04:002008-09-23T11:39:42.053-04:00

We will have a short course at the AMS Annual meeting January 11 in Phoenix AZ. It will cover an overview of the system and physics, the validation that we have already done, but the most important and interesting component will include several hands on tutorials working with data online. Given that the volume of data will be quite large, the subsetting and previewing tools should be useful to

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-12688584316684906882008-09-05T15:48:00.003-04:002008-09-05T15:55:48.384-04:00

Production of MERRA data has been progressing at 10 days per day on three streams, which is what is expected. Data monitoring is going on regularly, and the system seems to be moving along at the expected data quality. We have some time series routines being run, and will report on those when we achieve 8 full annual cycles. Currently, Streams 1 and 2 have more than 2.5 years each, and stream 3

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-88355421043003335252008-07-30T16:55:00.002-04:002008-07-30T17:00:43.628-04:00

A mail list has been established to pass on news and alerts regarding MERRA especially the data. Send an email to majordomo@listserv.gsfc.nasa.gov with the body of the message "subscribe merra-news"You will receive a message with instructions to confirm the subscription.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-44387495162763832172008-07-25T21:33:00.003-04:002008-07-25T21:37:04.680-04:00

There is a planned session on reanalyses at the AMS Annual meeting, co sponsored by the Committee on Hydrology and Climate Variability and Change Committee. The deadline is August 1. Please see the call for papers:http://www.ametsoc.org/MEET/annual/index.html

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-14671097390560479182008-07-17T12:30:00.003-04:002008-07-17T12:41:16.869-04:00

Late last week, the computing platform running MERRA was brought down for scheduled maintenance including an upgrade to the operating system. When it was brought back online, numerous scripts and control jobs for MERRA were broken. The science and executables for MERRA remain, but the control of jobs and data flow needed to be patched for the new OS. At this point, the three MERRA streams are

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-65005246672885996312008-07-01T14:54:00.006-04:002008-07-17T12:42:34.987-04:00

Recently the ECMWF Interim reanalysis has been released (see http://data.ecmwf.int/data/). We have a quick overlap and look at a comparison with MERRA at monthly time scales for January 1998.The figure below shows two features of the MERRA system we have been tracking since the system was under development, 1) negative zonal wind bias in the tropics and extratropics and 2) dry bias in the lower

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-81266323308621558932008-06-15T05:50:00.002-04:002008-06-15T05:57:24.702-04:00

Just a brief update. The updated sonde fixes seem to be going well. The restarted Stream 3 is into March 1998, and we have evaluated the early data. Stream 1 has completed 1979, and Stream 2 will complete 1989 in a day or so. While their has been scheduled downtime for the computing system (Discover), recent upgrades have paid off with 11 days/day of throughput per stream.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-53099038321444865462008-06-08T06:33:00.003-04:002008-06-08T06:39:08.075-04:00

Streams 1 and 2 have been progressing, and full years should be available by the end of this week.Stream 3 was held for the revision to the sonde data (station identifiers and launch times, see the May 23 post). However, it was decided to restart from January. Stream 3 is presently restarted and at Jan 11 1998.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-58314291849982075242008-05-29T20:51:00.002-04:002008-05-29T20:54:11.785-04:00

We've just opened a new link on the MERRA WWW page. It is a version of what our monitoring team is using to look quickly at various aspects of the circulation and water cycle. We'll be adding some other figures, like time series of the monthly data as well.http://gmao.gsfc.nasa.gov/research/merra/prequel/view.php

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-51077453285731431882008-05-23T20:55:00.005-04:002008-05-23T21:28:00.998-04:00

All three runs streams are progressing forward, 5 months in, approximately. However, as some folks here were making corrections a few weeks ago there were some unusual reports in the sonde data. Further investigation has found a problem that is fairly easily correctable. Actually there are two problems, and they change in time.Starting around 1988, the actual launch time isn't being considered,

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-60331907319389074592008-05-19T14:05:00.002-04:002008-05-19T14:20:08.309-04:00

All three streams have progressed through March and into April of their respective first years. Evaluation of the primary diagnostics and data usage seems as expected, and these first few months have passed monitoring tests. The data has been approved for transfer to the GES DISC, where the data will be available for download.We are still testing some of the software for accessing the data files.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-61477891537137895172008-05-14T08:47:00.002-04:002008-05-14T09:09:15.252-04:00

All three MERRA streams have been running, and past their respective first month. We have started evaluating the first months, so far no surprises. The evaluation is not yet completed. The vertically integrated budget diagnostics are fully incorporated in this version, and the online file specification document should be updated soon. The budgets are complete and deep into the terms of the

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-53074976460635348632008-05-02T11:43:00.003-04:002008-05-02T11:48:44.108-04:00

The fixed tag of the data assimilation system has been handed off to operations. They are preparing to restart the streams. However, we found that the updated PAOBS data had a problem in 1988. A different data format has caused problems there, but not in any otherdata files. The 1988 PAOBS are being reprocessed. Since this affects the start of the 1989 stream (stream 2), it will continue to hold

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-46753487707890922762008-05-01T07:41:00.003-04:002008-05-01T08:09:53.148-04:00

The previous post on reanalysis precipitation climatology was some extra information from a paper recently accepted at the Journal of Applied Meteorology and Climatology, the pre-press version is available online at AMS. Evaluations of the GEOS5 precipitation are discussed in the last section.More generally, the extended abstracts from the 3rd International Reanalysis Conference has been

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-83826561683955195822008-04-24T22:08:00.002-04:002008-04-24T22:20:07.193-04:00

The three streams are holding at the end of their spin up periods. Some refinements are being made to the budget output diagnostics for better closure. We have also been reviewing our input data holdings. A gap in the PAOB data set was found from 1997 through the end of 2000. The PAOB data starts back up in 2001 through our CDAS input data stream.After checking this issue with Jack Woolen at NCEP

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-17577161854755330962008-04-18T15:03:00.004-04:002008-04-19T18:56:35.657-04:00

The data drop reported in the last status posting prompted some deeper digging in the input data streams. One issue led to another, then another. Briefly, a bug fix that should have been zero difference actually caused double counting in some of the input data streams, affecting the 1979 and 1989 streams. Further, a resource file had incorrect settings in the 1998 stream, leading to several

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-48379786461860292842008-04-15T15:57:00.003-04:002008-04-15T16:03:19.342-04:00

Over the past weekend, Sondes dropped out for a day (mid-Oct 1979) from the data stream (they exist, but the something in the computing environment skipped a beat). So, on Monday AM 4/14, the 1979 stream was backed up to the previous restart before the data drop, and restarted. The monitoring team is looking for issues like this routinely.Checkout the revised Production Progress web page.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-51084675568412788702008-04-11T13:16:00.005-04:002008-04-12T07:47:23.560-04:00

There has been much going on, and a lot keeping me from these updates, unfortunately. There are several items I'll include here.First, our late 90's "scout run" (2 degree resolution, same system as MERRA) was running well ahead of the reanalysis, but encountered a problem in a single file of MSU data. There was a corruption in the input file. it has been found and corrected. That's the benefit of

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-20781594105970747812008-03-18T14:06:00.003-04:002008-03-18T14:15:30.971-04:00

We have started to put together a list of frequently asked questions regarding MERRA. Obviously, it will grow with the frequency of questions. Comments or questions posted here will also contribute to the list.http://gmao.gsfc.nasa.gov/research/merra/faq.php

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-43694534854928025112008-03-14T16:37:00.002-04:002008-03-14T16:42:52.649-04:00

All three streams have been running, though there was some down time on the supercomputer last night. So far:Stream 1: 19790227Stream 2: 19890121Stream 3: 19980109When the jobs are running, we get ~10 days per real day from each stream.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-76302136466415592922008-03-11T16:35:00.002-04:002008-03-11T16:40:40.107-04:00

All three MERRA streams are running. Stream 1 has just finished Jan1979, so we'll be evaluating that tomorrow. Streams 2 and three are still in their final spin up period, but will be finished with the spin up by tomorrow.We have a link to an image that is regularly updated and shows how much data of each stream has been produced, as well as how much data is left to produce.http://

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-429178802943077712008-03-07T20:23:00.002-05:002008-03-07T20:26:59.101-05:00

All the updates are checked in and Stream 1 (starting 1979) has restarted. Streams 2 and 3 should also start soon.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-9406416772556746062008-03-05T09:19:00.004-05:002008-03-05T09:42:37.366-05:00

Since the last post, we found that the coefficient update being implemented (and a required fix) also affected the MSU data for TIROS-N which is the only satellite data in early 1979. Since this is a non-zero difference, we need to rewind the 1979 MERRA stream (it had progressed to the start of NOAA-6, July 1, 1979) and rerun.While testing the updated coefficients, some zero-difference updates

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-71241053225861352932008-02-16T12:05:00.002-05:002008-02-16T12:18:51.531-05:00

The MERRA Stream 1 (starting Jan 1979) has been progressing steadily, up to mid March 1979. We've had a look at Jan 1979, and it looks to be within expectations. The second two streams are on hold, mainly because there are some short experiments still being run.However, it has also come to our attention that the CRTM team are fixing a bug in the coefficients for MSU radiances. Stream 1 won't

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-69223539258681504992008-02-10T07:58:00.000-05:002008-02-10T08:17:17.830-05:00

One of the last few fixes included in the system (discussed in the previous update), one that should have been minimal impact, greatly affected some code in the data assimilation. The result was that many wind observations that should have been assimilated were not. The problem was apparent (actually the system crashed), so the fix has been fixed.There have also been several down times in the

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-49331433115980258602008-01-31T20:05:00.000-05:002008-01-31T20:42:58.565-05:00

The three streams are ready to start. The first has run from Jan 1 1979 to Jan 9. However, all are on hold while system maintenance is being done (in other words, the computers are down).By Monday, I'll be back from the 3rd International Conference on Reanalyses in Tokyo Japan, with better information. It has been a very interesting meeting, with status updates from the 20th Century reanalysis

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-56099038203432921292008-01-27T09:51:00.000-05:002008-01-27T10:00:23.049-05:00

The three spinup runs reported earlier have completed 1 year of spin up. These have provided the starting points for the MERRA production. The output diagnostics have been updated to correct minor diagnostic bugs, and when the system is rebuilt, production will begin.I'm monitoring status from the 3rd WCRP International Conference on Reanalysis, and will this page when new information is

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-56790563163460192062008-01-19T10:39:00.000-05:002008-01-19T10:51:13.285-05:00

A data flag was out of place, and Stream 1 had to be backed up. All are still moving forward to the end of the December of their respective spin up phases.Stream 1 date completed: 19781202Stream 2 date completed: 19881124Stream 3 date completed: 19971124The at the end of December of each stream, the system will be rebuilt one last time.While checking the output data, several minor bugs were found

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-30714698527941985082008-01-12T08:00:00.000-05:002008-01-12T08:05:16.331-05:00

The Spin Up periods are still being processed. Stream 1 RUNNING at 11/01/78 Stream 2 RUNNING at 09/26/88 Stream 3 RUNNING at 09/27/97A group of GMAO folks have begun a final check of consistency between the output data files and the file specification document. The group will report back next Thursday.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-7585442122054767992008-01-04T14:23:00.000-05:002008-01-04T14:52:06.583-05:00

Over the holidays, the last few science fixes went into the system, and the spinup periods resumed. Each of the three MERRA processing streams is presently running, with the data to be discarded for spinup.Stream 1 RUNNING at 08/31/78 Stream 2 RUNNING at 07/30/88 Stream 3 RUNNING at 07/30/97As a reminder, the planned start day for each stream is Jan 1, 1979, 1989 and 1998 respectively. They are

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-63878495118930058722007-12-05T10:55:00.000-05:002007-12-13T20:49:55.636-05:00

On the MERRA WWW page, we are posting several figures showing the comparison of 5 satellite era reanalyses with GPCP and CMAP precipitation data sets. There are some similarities among the reanalyses, in their differences from the observations (Tropical precipitation, and interestingly European continental January precipitation), but also differences between the merged observation data sets (GPCP

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-82193987410889393032007-11-29T14:07:00.000-05:002007-11-29T14:13:43.465-05:00

Just a brief post. The spinup runs are still on hold. The physics in the system seems to be set and the output diagnostics are likewise set. The main hold up is that the adaptive bias correction of a small number of channels over land is not stabilizing even after long (coarse resolution) runs, and continues to grow ultimately leading to the rejection of observations that should otherwise be

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-65125014336238071282007-11-20T16:42:00.001-05:002007-11-20T17:21:09.289-05:00

In late 2005 a MERRA review group was formed from experts in various aspects of Earth system science and users of existing reanalyses. Their charge was to review the GMAO strategy for MERRA and the validation experimentation and results, possibly contributing some of their own analysis. The goal for GMAO was to gain a preliminary assessment of the scientific merit of the GEOS-5 data assimilation

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-21894050607883518362007-11-09T13:40:00.000-05:002007-11-09T15:57:14.090-05:00

The validation of the system has been somewhat time consuming between this post and the previous, and much has happened. At least 20 GMAO staff (or more) spent several weeks interogating the validation experiments each focusing on various Earth system components. On Oct 11, the GMAO held an internal review of the validation experiments. On Nov 7, the summary of these results were presented to our

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-36228051043643761062007-09-27T20:39:00.000-04:002007-09-27T21:01:56.729-04:00

Just a quick post on current jobs and activities.The validation runs for Jan-Jul and Jul-Oct 2004, Jan and Jul 2006, Jul and Aug 1987 are complete. Jan and Jul 2001 are going, and should wrap up next week. For the next two weeks a summary of the results will be pulled together.For production, the system will run in three data streams. Each stream will be spun up for two years at a coarse (2

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-71168059716984228432007-09-07T20:52:00.000-04:002007-09-12T21:17:49.026-04:00

GEOS5 uses an Incremental Analysis Update (IAU) to constrain the atmospheric numerical model by observations. The following figure shows the schematic of the procedure. Starting at 09Z, a 6 hour forecast is run, and forecast data from 09Z, 12Z and 15Z are used to create the analysis (blue diamond). From the analysis and the forecast, a tendency is calculated. This tendency is applied to another

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-5411317845066427992007-09-03T07:34:00.000-04:002007-10-01T14:34:47.091-04:00

The ocean atmosphere interactions are one of the crucial elements in climate variability. The MERRA system does not have a coupled ocean model and data assimilation, but future reanalyses will likely go in this direction. In MERRA, seas surface temperatures are prescribed and ocean surface wind observations (from buoys and satellites) are analyzed. Downward components of the radiation would be

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-52696715969816401582007-08-28T19:53:00.000-04:002007-08-30T10:20:38.265-04:00

Vacations in August have limited the posting, but the validation experiments are continuing. The experiments are moving well, and the system performance will be discussed in another post. Here are some of the validation comparisons for TOA radiation of some reanalyses to CERES ERBE-like data from Terra and Aqua. In the figures, the GEOS5 validation experiment is labeled d5_b10p15 (d is the 1/2

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-79073003663818334042007-08-10T17:06:00.000-04:002007-08-10T17:35:49.659-04:00

When evaluating one of our first analyses in the 1980s, we found some results very different from what was apparent in the recent (2001-2006) experiments. The experiment was run to test the impact of SSMI on the reanalysis time series (See this report). THe increments were drying the lower tropospehre continuously, and precipitation was small and getting smaller. Several aspect of the system were

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-72969265473621351712007-08-09T15:16:00.000-04:002007-08-09T15:18:46.410-04:00

Subject: JRA-25 paperDate: Thu, 09 Aug 2007 13:02:25 +0900From: JRA-25 user administrator Dear JRA-25 reanalysis data users,Sorry the address written in the previous mail was wrong.Please refer the next address.JRA-25 standard reference paper titled 'The JRA-25 Reanalysis' is aviailable fromhttp://www.jstage.jst.go.jp/article/jmsj/85/3/369/_pdf/-char/ja/Please forward this mail to researchers who

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-53459393295516660972007-08-04T19:35:00.000-04:002007-08-05T15:21:54.562-04:00

Precipitation from a couple cases has been posted previously. Below are the monthly mean differences from GPCP for the GEOS 5 2004 January and July validation experiment, compared with JRA25 and NCEP. Qualitatively, the patterns of difference maps seem quite similar among the reanalyses. Though, the GEOS5 US precipitation seems low where the others are high. The GEOS5 tropics are also lower than

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-48049009525805762062007-07-31T09:35:00.000-04:002007-07-31T16:14:53.435-04:00

Several validation runs have started, and results are only just becoming available.For 2004, two experiments have begun, one starting in January 2004, and the other starting in July 2004. These will run forward through 6 months to provide a full year of analysis. So far, the first months (January and July) have recently completed, and results for those months should be available soon.January 2006

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-72044811970881465632007-07-19T19:22:00.000-04:002007-07-19T19:51:19.817-04:00

Many modern atmospheric numerical models use terrain following vertical coordinates, meaning that the pressure of the lowest model level tracks the topography and does not intersect the surface. ERA40 and NCEP reanalyses have produced pressure level data extrapolated downward beneath the Earth’s surface. The result is that for 850, 925 and 1000 mb levels etc, continuous grids are available.

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0tag:blogger.com,1999:blog-3533345463695431192.post-51677506634541971892007-07-10T12:19:00.000-04:002007-07-11T19:17:54.158-04:00

The January 2006 validation experiment is underway. This period has been rerun enough in recent weeks that much of the preparatory work had already been done. The primary validation experiment for 2004, is still being prepared. Scripts, code and data need to be in place and working together, soon was the latest update.There has been much work on the mid- to late- 80s experiment (referred to as

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com2tag:blogger.com,1999:blog-3533345463695431192.post-9919091154595169852007-06-28T20:34:00.000-04:002007-07-11T13:53:14.923-04:00

Since the last post, work has progressed on setting up the validation experiments. Initial conditions are being created and assorted other tasks to make sure the system is configured. The jobs should be close to starting. However, there are some ongoing experiments that may affect the setup. First, the data group has applied some corrections to the sonde data for known biases (e.g. radiation). I

Michael Bosilovichhttp://www.blogger.com/profile/11147576587119755181noreply@blogger.com0