Atmospheric reanalyses comparison table advancing reanalysis. The global modeling and assimilation office gmao at nasa goddard space flight center uses the goddard earth observing system geos modeling and data assimilation system to prod. However, the data from 19481957 is a little different, in the regular non. Try these pages for help 4 days 21 hours ago processing era interim file in matlab 4 days 21 hours ago. Era5, the successor to erainterim, provides global, hourly estimates of atmospheric variables, at a horizontal resolution of 31 km and 7 vertical levels from the surface to 0. Merra 2 is the first longterm global reanalysis to assimilate spacebased observations of aerosols and represent their interactions with other physical processes in the climate system. Merra data are available at the modeling and assimilation data and information services center mdisc, managed by the nasa goddard earth sciences ges data and information services center disc. Flash droughtsuncharacteristically rapid dryings of the land systemare naturally associated with extreme precipitation deficits. I believe that the state of the art in reanalysis are, nowadays, the erainterim, nasamerr and ncepcfsr reanalysis.
Modern era reanalysis for research and applications merra funded nasa gmao effort surface input reanalysis for climate assessment sirca initial testing underway. The modernera retrospective analysis for research and applications merra dataset was released in 2009. Such precipitation deficits, however, do not tell the whole story, for land surface drying can be exacerbated by anomalously high evapotranspiration et rates driven by anomalously high temperatures e. Nasa gmao has released a new version of the merra dataset spanning 1980 to present. The project focuses on historical analyses of the hydrological cycle on a broad range of weather and climate time. The ncepncar reanalysis project at the noaaesrl physical sciences laboratory. The ncepncar reanalysis 1 project is using a stateoftheart analysisforecast system to perform data assimilation using past data from 1948 to the present.
Merra uses the current goddard earth observing system data assimilation system geos5 rienecker et al. Reanalysis and observational datasets and variables. Examples of reanalysis datasets include the ecmwf re analysis, the modernera retrospective analysis for research and applications, version 2 merra 2, and the ncepncar reanalysis n. It is based on a version of the geos5 atmospheric data assimilation system that was frozen in 2008. The modernera retrospective analysis for research and applications, version 2 merra 2 is a global atmospheric reanalysis produced by the nasa global modeling and assimilation office gmao. The improvements include an updated model with better physical parameterizations, assorted data assimilation errors were fixed and additional data were included. Modernera retrospective analysis for research and applications, version 2. It currently supports the download of era5, merra and merra 2 data, and in the future it may incorporate additional data sources. Merra 2 is a nasa reanalysis for the satellite era using a major new version of the goddard earth observing system data assimilation system version 5 geos5 produced by the nasa gsfc global modeling and assimilation office gmao. Video tutorial merra 2 giovanni nasa data use applied. Merra 2 motivation and objectives produce an ongoing, intermediate reanalysis for the satellite era using a recent version of geos5 to 1 address known limitations of merra c. Planned and potential reanalysis activities in the u.
Hello cathy, values of 1 month ago so should we truncate at download nasa merra reanalysis in netcdf using wget qi october 17, 2015 at 8. Merra is a nasa reanalysis for the satellite era using a major new version of the goddard earth observing system data assimilation system version 5 geos5 produced by the nasa gsfc global modeling and assimilation office gmao. A large subset of this data is available from psd in its original 4 times daily format and as daily averages. A global plot of reanalysis 1 mean relative humidity for the month of january 1948. This page points you to information on the ncepncar reanalysis project and the implementation of a netcdfbased, internetaccessible, data service at noaaesrl psl for this set of data products. Evolution of the meteorological observing system in. Demonstrates the use of the data downloader module of windographer professional edition, which lets you download longterm hourly wind speed, temperature, and pressure data from the merra data set. Modernera retrospective analysis for research and applications merra merra data access. Ecmwf uses its forecast models and data assimilation systems to reanalyse archived observations, creating global data sets describing the recent history of the atmosphere, land surface, and oceans. Overall, the performance of merra 2 relative to merra is mixed. In most cases, merra 2 better represents variability and trends in the global mean radiative fluxes over the period of analysis. B these linked articles include published references, and the jra25 reanalysis conducted by. Im trying to find some webbased reanalysis tools that i used to use.
The modernera retrospective analysis for research and applications, version 2 merra 2, features several major advances from the original merra reanalysis, including the use, outside of high latitudes, of observationsbased precipitation data products to correct the precipitation falling on the land surface in the merra 2 system. Read 4 answers by scientists with 4 recommendations from their colleagues to the question asked by leelambar singh on jan 28, 2018. Progress, challenges and opportunities, brief conference report, bull. Era5 atmospheric reanalysis ncar climate data guide. Jan, apr, jul, oct 2004 julyaugust 1987 jan, jul 2001 jul 2006 2 degree scout runs. Question about processing era interim file in matlab 4 days 21 hours ago. Nasa modern era reanalysis for research and applications version2 merra 2. This image was produced by downloading one file of reanalysis 1 data through nomads and visualizing with the grid analysis and display system grads.
Windographer data downloader this tool allows you to download longterm meteorological data for anywhere on the surface of the earth for free. The nasa climate reanalysis dataset from merra 2 and the land data assimilation system ldas datasets, distributed at goddard earth sciences data and information services center ges disc. Alexander 20, tropical precipitation variability and convectively coupled equatorial waves on submonthly time scales in reanalyses and trmm, j. The narr model uses the very high resolution ncep eta model 32km45 layer together with the regional data assimilation system rdas which, significantly. Merra 2 includes a representation of ice sheets over say greenland and antarctica. Ecmwf has released their second reanalysis and first coupled of the 20th century. The noaa cpo modeling, analysis, prediction, and projections mapp program hosted a webinar on the topic of evaluation of reanalysis products on september 2. Produced by ecmwf, era5 presently extends back to 1979.
It spans the satellite observing era from 1980 to the present. We have transitioned the data files from netcdf3 to netcdf4classic format on monday oct 20th, 2014. I need to look at average 500 mb gph for a few months and do some correlation plots. Evaluation of the reanalysis products from gsfc, ncep, and. The narr project is an extension of the ncep global reanalysis which is run over the north american region. I consulted your comparison table for the atmospheric reanalysis, but the publicly available dataset resolution presents datasets that are not freely available to. Notably arid regions of the globe are marked in deep shades of blue. The modern era retrospectiveanalysis for research and applications merra was undertaken by nasas global modeling and assimilation office with two primary objectives. Merra data span the period 1979 through february 2016 and were produced on a 0. Ncep reanalysis r2 ncepdoe reanalysis ii r2 is an improved version of the ncepncar reanalysis i r1. Incorporate modern satellite observation types not available to merra. Video introduction and tutorial to giovanni platform of nasa, for data usage from the merra 2 data set applied to air quality monitoring networks design.
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