Recent Changes in Earth Oblateness: Causes and Implications

Details Recent Changes in Earth Oblateness: Causes and Implications Recent Changes in Earth Oblateness: Causes and Implications

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.u72a0013d&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #U72A-0013

Physics

1213 Earth'S Interior: Dynamics (8115, 8120), 1221 Lunar Geodesy And Gravity (6250), 1223 Ocean/Earth/Atmosphere Interactions (3339), 3309 Climatology (1620), 4203 Analytical Modeling

Scientific paper

Fluctuations in the Earth's dynamic oblateness (J2) as measured by space geodetic technique over more than two decades, are dominated by a seasonal cycle and a negative trend induced mostly by post-glacial rebound. However, since 1998 the Earth's J2 has begun to increase, indicating a pronounced global-scale mass redistribution within the Earth system from high to low latitudes. Cox and Chao reported this discovery in Science (August 2, 2002) and left the sources of this anomaly unresolved. Here, we present the results of our analysis, identifying the source and discussing the implications.

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