Cams global reanalysis eac4 for the time being, the data remains also listed in ecmwfs public data catalogue. The procedure is install the package devtools you only have to do this once. The gmao merra data product is a 30year reanalysis done with the nasagmao geos data assimilation system. The earth data analytics service edas is a highperformance big data analytics framework allowing researchers to analyze large datasets located at the nccs. Merra consists of 26 climate variables available, from 1979. Reanalysis1 reanalysis2 are two global reanalyses of atmospheric data spanning 19481979 to the present at a 2. Other sites may also have the data ncar, for example and those methods would be different than those below. 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. The cams reanalysis is the latest global reanalysis data set of atmospheric composition ac produced by the copernicus atmosphere monitoring service, consisting of 3dimensional time.
The merra reanalysis dataset production was completed on. Narr is a regional reanalysis of north america containing temperatures, winds, moisture, soil data, and dozens of other parameters at 32 km horizontal resolution. The data is available for free download from the noaa earth system research laboratory and ncep. Modernera retrospective analysis for research and applications reanalysis monthly precipitation flux. It is distributed in netcdf and grib files, for which a number of tools and libraries exist.
Script to download nasamerra reanalysis in netcdf using. Nasas modern era retrospectiveanalysis for research and application merra description. Ecmwf uses its forecast models and data assimilation systems to reanalyse archived. The latest updates and issues for the page are available. Each dataset is reformatted similarly to facilitate comparison with each other. Generic information about the ncepncar reanalysis data files on this site. On some of the files the history variable ncdump h filename. 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. Merra2 is also the first satelliteera global reanalysis to assimilate spacebased observations of aerosols and represent their interactions with other physical. Unified user interface at nasa, uui, data, ges disc, datasets. Merra data is commonly available within windpro with a timelag of 12 months. Mar 12, 2020 however, you can download and install the most uptodate version directly from this repository. A global plot of reanalysis1 mean relative humidity for the month of january 1948. Merra 2 is intended to replace the merra reanalysis product which was created with geos5.
The iem will continue to provide single site observational data, but for some purposes, this dataset will be easier to work with. They generally extend back from the present day to 1948, and cover the entire globe. Windographer data downloader free era5 and merra2 data. The pentadmeans are calculated from dailyaverage data obtained at various times from the ncep ncar reanalysis project archive at the noaa climate diagnostics center. Nasa gmao has released a new version of the merra dataset spanning 1980 to present. Era5 data are available in the climate data store on regular latitudelongitude grids at 0. It spans the satellite observing era from 1980 to the present. Worldwide validation of cams and merra2 reanalysis.
In this study, satellitebased precipitation data from gpcp and hoaps and reanalysis derived precipitation data from erainterim and from the national aeronautics and space administration nasa modernera retrospective analysis for research and applications merra are evaluated. It currently supports the download of era5, merra and merra2 data, and in the future it may incorporate additional data sources. Era5 is the latest climate reanalysis produced by ecmwf, providing hourly data on many atmospheric, landsurface and seastate parameters together with estimates of uncertainty era5 data are available in the climate data store on regular latitudelongitude grids at 0. Reanalysis and observational datasets and variables. Significant improvement in precipitation and water vapor climatology over older reanalyses. Pdf does the merra2 aerosol reanalysis introduce an. The ncepdoe reanalysis 2 project is using a stateoftheart analysisforecast system to perform data assimilation using past data from 1979 through the previous year.
The second project is the ncepdoe reanalysis reanalysis 2 project, a global reanalysis of atmospheric data spanning 1979 to present. It is currently being produced with the gmaogeos5 data assimilation system version 5. Specifically, the geosdas version 5 implements incremental analysis updates iau to slowly adjust the model states toward the observed state. Sep 25, 2015 merra 2 is a reanalysis data product from nasagmao.
On the other hand, merra2 data can be accessed from nasas goddard earth sciences data and information services center ges disc. Reanalysis and observational datasets and variables available. The modernera retrospective analysis for research and applications merra dataset was released in 2009. Compared to its predecessor, jra25, jra55 is based on a new data assimilation and prediction system da that improves many deficiencies found in the first. Windographer data downloader this tool allows you to download longterm meteorological data for anywhere on the surface of the earth for free. However, you can download and install the most uptodate version directly from this repository. A large subset of this data is available from psd in its original 4 times daily format and as daily averages. The merra reanalysis product ceased in mid2015 and is now obsolete. 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. 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. Merra2 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. Online visualization and value added services of merra2. Evaluation of satellitebased and reanalysis precipitation.
A first segment of the era5 dataset is now available for public use 1979 to within 5 days of real time. It is based on a version of the geos5 atmospheric data assimilation. The model constructs an hourly time series of regionaltotal wind power over any specified time period since 1979, using merra reanalysis wind speed data. The reanalysis ensemble service res enables users to make queries on reanalysis datasets. What is the best data center to download world climatic data. Merra2 includes a representation of ice sheets over say greenland and antarctica. The reanalysis data are available for numerous meteorological parameters, as 6hourly observations, and daily and monthly averages. Mar 04, 2019 merra2 is a nasa atmospheric reanalysis integrating satellite data assimilation and aims at historical climate analyses. When i extract data, result values are all the same. Merra2 is the first longterm global reanalysis to assimilate spacebased observations of aerosols and represent their interactions with other physical processes in the climate system.
The ncepncar reanalysis data set is a continually updated 1948present globally gridded data set that represents the state of the earths atmosphere, incorporating observations and numerical weather prediction nwp model output from 1948 to present. Merra2 data are available at mdisc, managed by the nasa goddard. It was created in cooperation with the national center for atmospheric research ncar. Merra2 is the first longterm global reanalysis to assimilate. Nasas modernera retrospective analysis for research. Support for merra meteorology was removed from v1102d and later versions.
Merra2 covers land surface diagnostics for the period 1980present at 0. It is available for download through the ncar cisl research data archive on the ncepncar reanalysis main data page. When the data have been processed at emd, then the following parameters are available from within the online data services within windpro. By comparing merra with other updated reanalyses the interim version of the next ecmwf. This is due to the processing time of the data at nasa and the subsetprocessing at emd. It covers 55 years, extending back to 1958, coinciding with the establishment of the global radiosonde observing system. The system, the input data streams and their sources, and the observation and. Merra 2 includes a representation of ice sheets over say greenland and antarctica. B these linked articles include published references, and the jra25 reanalysis conducted by the japan meteorological agency. On the other hand, merra 2 data can be accessed from nasas goddard earth sciences data and information services center.
Includes atmospheric mass, moisture and energy budget products from the ncepncar reanalysis r1. Video tutorial merra 2 giovanni nasa data use applied. Reanalysis data documentation copernicus knowledge. Era5 provides hourly estimates of a large number of atmospheric, land and oceanic climate variables.
It currently supports the download of era5, merra and merra 2 data, and in the future it may incorporate additional data sources. Only daily and 6hourly data sets are referenced here, for a quarterspherical window covering eastern america and westcentral eurasia. Merra2 is also the first satelliteera global reanalysis to assimilate space based observations of aerosols and represent their interactions with other physical. In addition, the experiment shows that the reanalysis of the r s data by erainterim and merra2 is higher than the ground observation station data, which is consistent with the previous. Simplistic overview of reanalysis data assimilation methods.
B these linked articles include published references, and the jra25 reanalysis conducted by. One thought on script to download nasamerra reanalysis in netcdf using wget qi october 17, 2015 at 8. Merra uses a threedimensional variational data assimilation. The ncepncar reanalysis 1 project is using a stateoftheart analysisforecast system to perform data assimilation using past data from 1948 to the present. Ftp subsetter facilitates downloads of partial datasets. Monthly data sets, and some alternative windows have been extracted, although they will be superceded by the new window. Online visualization and value added services of merra2 data. Worldwide validation of cams and merra2 reanalysis aerosol. The 3hourly cams reanalysis data can be accessed using the ecmwf web api.
Webbased reanalysis intercomparison tools writ allows users to quick analyze and intercompare multiple contemporary reanalyses data. Retrospective analysis reanalysis data products are based on the assimilation of a vast number of in situ and remote sensing observations into. In this study, satellitebased precipitation data from gpcp and hoaps and reanalysisderived precipitation data from erainterim and from the national aeronautics and space administration nasa modernera retrospective analysis for research and applications merra are evaluated. The modernera retrospective analysis for research and applications, version 2 merra2 is a global atmospheric reanalysis produced by the nasa global modeling and assimilation office gmao. See how the nccs climate data services supports the climate. Feb 01, 2019 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. Iem reanalysis is an effort to provide a regular dataset of iowa environmental data without many of the problems associated with single site observations.
The data cover the earth on a 30km grid and resolve the atmosphere using 7 levels from the surface up to a height of 80km. This image was produced by downloading one file of reanalysis1 data through nomads and visualizing with the grid analysis and display system grads. However, the data from 19481957 is a little different, in the regular non. Analysis erainterim and the climate forecast system reanalysis cfsr, advances made in this new generation. The data is now available from the atmosphere data store ads, either interactively through its download web form or programmatically using the cds api service. Era5 is the latest climate reanalysis produced by ecmwf, providing hourly data on many atmospheric, landsurface and seastate parameters together with estimates of uncertainty. Examples of reanalysis datasets include the ecmwf reanalysis, the modernera retrospective analysis for research and applications, version 2 merra2, and the ncepncar reanalysis n. The japan meteorological agency jma conducted jra55, the second japanese global atmospheric reanalysis project. The 21yr period from 1980 to 2000 is chosen to include satellite data, which considerably improve the quality of the reanalysis products from 1980 onward sterl 2004.
Sep 24, 2018 these datasets are produced by combining stateoftheart reanalyses nasas modernera retrospective analysis for research and applications, merra, rienecker et al. Incorporate modern satellite observation types not available to merra. Nasas earth observing system data and information system eosdis is a key core capability in nasas earth science data systems program for archiving and distributing earth science data from multiple missions to users. Merra data span the period 1979 through february 2016 and were produced on a 0. An ftp subsetter facilitates downloads of partial datasets. Pages and meetings area for questions, notes, and comments on recently released atmospheric reanalyses.
Includes atmospheric mass, moisture and energy budget products from the cfsr reanalysis new. Plot monthly maps or vertical crosssections from different reanalysis datasets as well as differences between reanalyses. Apr 10, 2017 the modernera retrospective analysis for research and applications merra dataset was released in 2009. Era5 includes information about uncertainties for all variables. After data is produced, the gmao examines the data files in several ways to test the quality of the data. When the data have been processed at emd, then the following parameters are available. Climate data services nasa center for climate simulation. Video introduction and tutorial to giovanni platform of nasa, for data usage from the merra2 data set applied to air quality monitoring networks design. A large subset of this data is available from psl in its original 4 times daily format and as daily averages. The collaborative reanalysis technical environment intercomparison procject createip is a project designation in the earth system grid federation esgf that is a collection of data from selected major reanalysis efforts underway today.
Here we document the cams reanalysis dataset, which, eventually, will cover the period january 2003 to near real time nrt, though currently only data for the period 20032018 have been released. Merra2 is a nasa atmospheric reanalysis integrating satellite data assimilation and aims at historical climate analyses. Sinha, in cloud computing in ocean and atmospheric sciences, 2016. Evaluation of reanalysis surface incident solar radiation. 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. Reanalysis similarity is tested for the 0000 utc time series of temperature t, geopotential z, and specific humidity q at 500 and 850 hpa e. The first is the ncepncar reanalysis reanalysis 1, a global reanalysis of atmospheric data spanning 1948 to present. Ecmwf has released their second reanalysis and first coupled of the 20th century. Merra 2 data are available at mdisc, managed by the nasa goddard earth sciences ges data and information services center disc.
We recommend that you use either geosfp, which is the current operational gmao met data product, or merra 2, which is the current gmao reanalysis product. When we are confident that the data files are within the tolerance of the uncertainty we have seen in our validation experiments, we release it to the mdisc. Model download department of meteorology university of reading. Jan, apr, jul, oct 2004 julyaugust 1987 jan, jul 2001 jul 2006 2 degree scout runs. It is a joint product from the national centers for environmental prediction ncep and the national center for atmospheric research ncar. Jan 29, 2019 merra2 is a nasa atmospheric reanalysis integrating satellite data assimilation and aims at historical climate analyses. Merra is a reanalysis dataset that synthesizes data from earth observing systems, such as satellites, and the results from numerical climate models to create an integrated dataset that is temporally and spatially consistent schnase, 2014. Script to download nasamerra reanalysis in netcdf using wget. It is based on a version of the geos5 atmospheric data assimilation system that was frozen in 2008. Please email us or post comments to the wiki page with any issues, suggestions or comments. Reanalysis1 reanalysis2 national climatic data center. Notably arid regions of the globe are marked in deep shades of blue. Using griddap to request data and graphs from gridded datasets griddap lets you request a data subset, graph, or map from a gridded dataset for example, sea surface temperature data from a satellite, via a specially formed url.
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