Abstract: The MAI3CPASM or inst3_3d_asm_Cp data product is the MERRA Data Assimilation System 3-Dimensional assimilated state on pressure, at a reduced resolution. It is a history file that is produced from the GCM during the corrector segment of the IAU cycle. All collections from this group are at reduced horizontal resolution. MERRA, or the Modern Era Retrospective-analysis for Research and Application, ... is a NASA reanalysis for the satellite era (30 years 1979-current) using the Goddard Earth Observing System Data Assimilation System Version 5 (GEOS-5 DAS).
This data product contains 2-dimensional and 3-dimensional fields that do not vary during the reanalysis. The data are on the GEOS-5 native 288 x 144 grid with 1.25° longitude x 1.25° latitude resolution. The pressure-level data will be output in 42 pressure levels. The files contain the following times compacted into a daily file: 00, 03, 06, 09, 12, 15, 18, 21 GMT. Data are archived in the HDF-EOS (Grid) format, based on HDF4.
Parameters contained in the data files are the following: Variable Name|Description|Units SLP|Sea-level pressure|Pa PS|Surface pressure|Pa PHIS|Surface Geopotential|m2s-2 H|Geopotential height|m O3|Ozone mixing ratio|kg kg-1 QV|Specific humidity|kg kg-1 QL|Cloud liquid water mixing ratio|kg kg-1 QI|Cloud ice mixing ratio|kg kg-1 RH|Relative humidity|percent T|Air temperature|K U|Eastward wind component|m s-1 V|Northward wind component|m s-1 PV|Ertel potential vorticity|m2kg-1s-1 OMEGA|Vertical pressure velocity|Pa s-1
The Open Source Project for a Network Data Access Protocol (OPeNDAP) enables fine-grained access to many datasets over the Internet and also makes datasets more usable in netCDF-based tools such as IDV, McIDAS-V, Panoply and Ferret.
The GES-DISC Interactive Online Visualization ANd aNalysis Interface (Giovanni) is a web-based tool that allows users to analyze gridded data interactively online without having to download any data. Through Giovanni, users are invited to discover and explore our data using sophisticated analyses and visualizations.
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