June 10, 2010

Steve Cole Headquarters, Washington
202-358-0918 stephen e cole@nasa gov

John Yembrick Headquarters, Washington 202-358-1100 john yembrick-1@nasa gov

RELEASE: 10-138

NASA AND DLR SIGN AGREEMENT TO CONTINUE GRACE MISSION THROUGH 2015

WASHINGTON -- NASA Deputy Administrator Lori Garver and German Aerospace Center (DLR) Executive Board Chairman Johann-Dietrich Worner signed an agreement Thursday during a bilateral meeting in Berlin to extend the Gravity Recovery and Climate Experiment (GRACE) mission through the end of its on-orbit life, which is expected in 2015

Launched in March 2002, GRACE tracks changes in Earth's gravity field by noting minute changes in gravitational pull from local changes in Earth's mass It does this by measuring changes in the distance between its two identical spacecraft to one-hundredth the width of a human hair These spacecraft are in the same orbit approximately 137 miles apart

"The extension of this successful cooperative mission demonstrates the strength of the NASA-DLR partnership and our commitment to continue working together in this very important area of Earth science," Garver said

NASA and DLR signed the original agreement in 1998 The two agencies jointly developed the GRACE mission and have cooperated on its operational phase since its launch For the twin satellite mission, NASA provided the instruments and selected satellite components, plus data validation and archiving DLR provided the primary satellite components, launch services and operations

GRACE maps gravity-field variations from month to month, recording changes caused by the seasons, weather patterns and short-term climate change

"The extension of this successful mission will deliver more valuable data to help us understand how Earth's mass and gravity varies over time," Worner said "This is an important component necessary to study changes in global sea level, polar ice mass, deep ocean currents, and depletion and recharge of continental aquifers We appreciate the strong cooperation with our partner NASA "

GRACE's monthly maps are up to 100 times more accurate than existing maps, substantially improving the accuracy of techniques used by oceanographers, hydrologists, glaciologists, geologists and climate scientists

Data from the GRACE mission have been used to measure the amount of water lost in recent years from the aquifers for California's primary agricultural region in the state's Central Valley An international study recently used GRACE data to show that ice losses from Greenland's ice sheet now are rapidly spreading up its northwest coast

For more information about the GRACE mission, visit:

http://science nasa gov/missions/grace

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