GRACE GAA: Non-Tidal Atmosphere Geopotential Coefficients from GFZ

GRACE mission data processed by the German Research Centre for Geosciences (GFZ) provides estimates of the Earth's geopotential field. The dataset contains spherical harmonic coefficients averaged over approximately monthly intervals, derived from continuous measurements of distance changes between twin spacecraft in a 500 km polar orbit. These measurements, combined with accelerometer, star camera, and GPS data, are used to model time-variable gravity field variations.

Use Cases

• Modeling large-scale hydrological changes based on gravity field variations.
• Analyzing atmospheric mass redistribution based on non-tidal atmospheric model outputs.
• Studying long-term climate signals from monthly-averaged geopotential coefficients.
• Calibrating or validating other Earth observation models based on GRACE-derived gravity data.

Strengths

• Data originates from the established GRACE satellite mission, a primary source for gravity field measurement.
• Processing includes high-accuracy instruments: microwave ranging, electrostatic accelerometers, star cameras, and GPS receivers.
• Produced by the authoritative German Research Centre for Geosciences (GFZ), release 6.0.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration; German Research Centre for Geosciences (GFZ).

Collection Method

Derived from GRACE twin spacecraft measurements (microwave ranging, accelerometer, star camera, GPS) and a non-tidal atmospheric model.

Time Range

Temporal coverage is not explicitly stated, but data is averaged over approximately monthly intervals.

Freshness

Last updated 2026-03-13 01:50:43.092919; freshness should be verified.

Geography

Global coverage from satellite measurements in a near-polar orbit.