NASA Jet Propulsion Lab Gravity Recovery and Climate Experiment

he twin GRACE satellites, launched March 17, 2002, are designed to produce a new model of the Earth's gravity field with unprecedented accuracy. The estimates of the time variations in the gravity field obtained from GRACE, in conjunction with other satellite and in-situ data, and geophysical models, can provide improved measurements of deep ocean currents, ocean bottom pressure, sea level rise, sea ice mass variation and distribution, soil moisture, groundwater transport, and land density.