Measurements of Time-Variable Gravity Show Mass Loss in Antarctica-Reference-Cited by-同舟云学术

Measurements of Time-Variable Gravity Show Mass Loss in Antarctica

Published:2006-03-24 Issue:5768 Volume:311 Page:1754-1756
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Velicogna Isabella¹²,Wahr John¹²

Affiliation:

1. University of Colorado, Cooperative Institute for Research in Environmental Sciences and Department of Physics, University Campus Box 390, Boulder, CO 80309–0390, USA.

2. Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 300-233, Pasadena, CA 91109–8099, USA.

Abstract

Using measurements of time-variable gravity from the Gravity Recovery and Climate Experiment satellites, we determined mass variations of the Antarctic ice sheet during 2002–2005. We found that the mass of the ice sheet decreased significantly, at a rate of 152 ± 80 cubic kilometers of ice per year, which is equivalent to 0.4 ± 0.2 millimeters of global sea-level rise per year. Most of this mass loss came from the West Antarctic Ice Sheet.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference19 articles.

1. Mass Balance of Polar Ice Sheets

2. J. A. Churchet al., in Climate Change 2001: The Scientific Basis, Third Assessment Report of the IPCC (Cambridge Univ. Press, Cambridge, 2001), pp. 639–694.

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4. Accelerated Sea-Level Rise from West Antarctica

5. GRACE launched in March 2002 and administered by NASA and the Deutsches Zentrum für Luft-und Raumfahrt is mapping Earth's gravity field every 30 days during its 10- to 11-year lifetime. GRACE consists of two identical satellites in identical orbits separated by ∼220 km. The satellites use microwaves to monitor their separation distance. Onboard accelerometers and Global Positioning System receivers detect nongravitational accelerations and geocentric orbital motion.

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