MERRA-2 Hourly Gridded Innovations and Observations - Conventional V1 (M2_HOURLY_CONV)

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 hourly values for various measurements (temperature profile [tv], water vapor profile [qv], zonal wind [u], meridional wind [v], surface pressure [ps], and sea surface temperature [sst]) from several conventional observation sources, including radiosondes, land surface stations, aircraft, scatterometers, and drifting buoys. The dataset also contains observation data counts (nobs) and assimilation statistics, including: (a) forecast departure, or observation minus forecast (OmF), and (b) analysis departure, or observation minus analysis (OmA).

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated September 15, 2026, 05:44 (UTC)
Created August 11, 2026, 01:36 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 01d21e2a-3b37-4d14-8633-498342738af8
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.5067/MEASURES/MERRA2_HOURLY_CONV
license https://www.usa.gov/government-works
modified 2026-09-07T22:16:04Z
programCode {026:000}
publisher NASA/GSFC/SED/ESD/TISL/GESDISC
resource-type Dataset
source_datajson_identifier true
source_hash f4802e5e630bc8b3a40bcc6584d061b2bc2557b1aca1b7d42479e46fdf95daa1
source_schema_version 1.1
spatial ["CARTESIAN", [{"WestBoundingCoordinate": -180, "NorthBoundingCoordinate": 90, "EastBoundingCoordinate": 180, "SouthBoundingCoordinate": -90}]]
temporal 1979-12-31/2026-09-07
theme {"Earth Science"}