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MERRA-2 provides a global atmospheric reanalysis from 1980 to the present with a latency of about three weeks. This collection, M2TMNPRAD, contains monthly mean assimilations of radiation diagnostics, such as cloud fraction for radiation and air temperature tendencies due to longwave and shortwave radiation, across 42 pressure levels. It is produced by NASA's Global Modeling and Assimilation Office using the Goddard Earth Observing System Model version 5.12.4.
Users must check the 'Records of MERRA-2 Data Reprocessing and Service Changes' as reprocessed data filenames differ from original files. Data access requires familiarity with NASA Earthdata tools and formats.