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Science 6 December 2002:
Vol. 298. no. 5600, p. 1843
DOI: 10.1126/science.298.5600.1843b
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Recently, Cox and Chao (2 August, p. 831) determined that Earth's dynamic oblateness had increased sharply in 1998. Now Dickey et al. (p. 1975) show that the increase is related to oceanic mass redistribution caused by the Pacific Decadal Oscillation and the El Niño-Southern Oscillation and an increase in subpolar glacier melting. Once these short-term climatic effects are excluded, the longer-term decrease in oblateness caused by postglacial rebound can be refined to estimate the viscosity of the lower mantle.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)