MERRA-2 Monthly Gridded Innovations and Observations SSU_N09 0.5 x 0.625 degree V1 (M2_SSU_N09)

The MERRA-2 Gridded Innovations and Observations (GIO) dataset provides assimilated observations and key statistics generated during observational data assimilation. GIO data are created by binning observations and innovations onto grids consistent with MERRA-2 specifications and storing them in NetCDF format for convenient access. This dataset serves multiple purposes: it shows which data was assimilated (where and when), enables systematic evaluation of observing system impacts in reanalysis, provides a resource for teaching data assimilation concepts, and offers training data for machine learning and artificial intelligence applications.

This collection includes monthly mean and standard deviation values for brightness temperature (mean_obs, stdv_obs) from satellite sensor SSU_N09 along with observation data counts (nobs_obs), and assimilation statistics, including: (a) forecast departure, or observation minus forecast (OmF) (mean_omf, stdv_omf); (b) analysis departure, or observation minus analysis (OmA) (mean_oma, stdv_oma); and (c) bias corrections for satellite radiances (mean_bias, stdv_bias).

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated October 20, 2026, 11:15 (UTC)
Created June 2, 2026, 22:08 (UTC)
Identifier 10.5067/MEASURES/MERRA2_SSU_N09
Modified 2026-10-15T20:12:07Z
Theme {"Earth Science"}
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id ec479dea-98f7-4763-8f2f-9e853c65759e
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
license https://www.usa.gov/government-works
programCode {026:000}
publisher NASA/GSFC/SED/ESD/TISL/GESDISC
resource-type Dataset
source_datajson_identifier true
source_hash 6968d5f6d46cf6067b30bf8e912e0d9ab6a68a9019479718746c7e928f09dc8c
source_schema_version 1.1
spatial ["CARTESIAN", [{"WestBoundingCoordinate": -180, "NorthBoundingCoordinate": 90, "EastBoundingCoordinate": 180, "SouthBoundingCoordinate": -90}]]
temporal 1984-12-31/1988-11-30