Geophysics and Gravity Measurements

Satellite gravity missions like GRACE track tiny fluctuations in Earth's gravitational pull to measure how water is redistributing across the planet — from melting polar ice sheets to shrinking underground aquifers — and how those shifts drive sea level rise. By combining these geodetic measurements with hydrological models, researchers can attribute observed changes in global sea level to specific sources, distinguishing the contributions of glacial melt, thermal expansion, and terrestrial water storage with increasing precision. One pressing open question is how groundwater depletion from irrigation and human consumption, largely invisible to traditional monitoring, factors into long-term sea level projections. Improving the spatial resolution of satellite gravity data and reconciling discrepancies between independent measurement techniques remain active areas of work as the field moves toward more reliable forecasts of future coastal flooding.

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Keywords

GRACEsea level risegroundwater depletionclimate changesatellite measurementspolar ice sheets