Recent changes in the Earth's oblateness driven by Greenland and Antarctic ice mass loss

被引：42

作者：

Nerem, R. S. ^{[1
,2
]}

Wahr, J. ^{[2
,3
]}

机构：

[1] Univ Colorado, Colorado Ctr Astrodynam Res, Boulder, CO 80309 USA

[2] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[3] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷

基金：

美国国家科学基金会;

关键词：

DAY SECULAR VARIATIONS; TIME-VARIABLE GRAVITY; GRACE MEASUREMENTS; CLIMATE; HARMONICS; SURFACE; SYSTEM; FIELD;

D O I：

10.1029/2011GL047879

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We use temporal gravity variations from GRACE to investigate changes in a 34-year time series of Earth's oblateness (J(2)) observed by satellite laser ranging (SLR). We use 2002-2010 GRACE data to compute the effects of Greenland and Antarctic ice mass variations on J(2) (2.0 and 1.7 x 10(-11)/year respectively). Their combined effect on the J(2) trend during the GRACE mission is 3.7 x 10(-11)/year, which agrees well with the GIA-corrected SLR J(2) trend over the same time period. The results suggest that at least since 2002, ice loss from Greenland and Antarctica has been the dominant contributor to the current GIA-corrected J(2) trend, which apparently began sometime in the 1990s. Citation: Nerem, R. S., and J. Wahr (2011), Recent changes in the Earth's oblateness driven by Greenland and Antarctic ice mass loss, Geophys. Res. Lett., 38, L13501, doi:10.1029/2011GL047879.

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