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MERRA-2 provides a global atmospheric reanalysis from 1980 to present, updated with a latency of approximately three weeks. This monthly mean collection includes meteorology diagnostics such as air temperature at multiple levels, wind components, sea level pressure, and total precipitable water vapor. It is produced by NASA's Global Modeling and Assimilation Office using the GEOS version 5.12.4 model.
Users must check the 'Records of MERRA-2 Data Reprocessing and Service Changes' as reprocessed data filenames differ from originals. Data announcements and tool changes are communicated via a mailing list managed by the GES DISC Help Desk.