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Gravity Recovery and Climate Experiment
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Gravity Recovery and Climate Experiment
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Gravity Recovery and Climate Experiment
Gravity Recovery and Climate Experiment Artist's rendering of the Gravity Recovery and Climate Experiment.

Gravity Recovery and Climate Experiment

Earth-mapping mission
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Also known as: GRACE
Written by
Dave Dooling
Education and Public Outreach Officer, National Solar Observatory, Sacramento Peak, New Mexico. Coauthor of Engineering Tomorrow.
Dave Dooling
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Date:
March 17, 2002 - present
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Gravity Recovery and Climate Experiment (GRACE), U.S.-German Earth-mapping mission consisting of twin spacecraft GRACE 1 and 2 (nicknamed Tom and Jerry after the cartoon characters). GRACE 1 and 2 were launched on March 17, 2002. By tracking the precise distance between the two spacecraft and their exact altitude and path over Earth, scientists could measure subtle variations in Earth’s gravitational field and detect mass movements due to such natural activity as sea level changes, glacial motions, and ice melting. GRACE observed an accelerating loss of ice in Greenland and Antarctica and the change in the gravitational field caused by the Sumatran earthquake responsible for the 2004 Indian Ocean tsunami.

Dave Dooling