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MERRA-2 provides an hourly, global atmospheric reanalysis from 1980 to the present. The M2I1NXASM collection contains instantaneous assimilations of meteorological parameters like 2-meter temperature, 10-meter wind components, surface pressure, and total precipitable water. NASA's Global Modeling and Assimilation Office produces this data using the Goddard Earth Observing System Model.
Users must check documentation for records of data reprocessing, as reprocessed files have different names. Access requires registration with NASA Earthdata. Data announcements and service changes are communicated via a mailing list.