MERRA-2 Monthly Gridded Innovations and Observations SSMI_F15 0.5 x 0.625 degree V1 (M2_SSMI_F15)

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 SSMI_F15 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 September 15, 2026, 03:09 (UTC)
Created June 2, 2026, 23:48 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id ecf9105e-4697-43fc-aa87-51d7f4cf0716
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.5067/MEASURES/MERRA2_SSMI_F15
license https://www.usa.gov/government-works
modified 2026-09-07T22:16:02Z
programCode {026:000}
publisher NASA/GSFC/SED/ESD/TISL/GESDISC
resource-type Dataset
source_datajson_identifier true
source_hash 97b01e0af9598e6a506444d9f48c22a8f4c65485fda05e8eef5b0c89cf24a5b5
source_schema_version 1.1
spatial ["CARTESIAN", [{"WestBoundingCoordinate": -180, "NorthBoundingCoordinate": 90, "EastBoundingCoordinate": 180, "SouthBoundingCoordinate": -90}]]
temporal 1999-12-31/2006-08-31
theme {"Earth Science"}