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Decadal and quadratic variations of Earth's oblateness and polar ice mass balance from 1979 to 2010

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Title
Decadal and quadratic variations of Earth's oblateness and polar ice mass balance from 1979 to 2010
Other Titles
1970년에서 2010년사이의 지구 편평도의 장주기 변동과 극지 빙상 질량 수지
Authors
Seo, Ki-Weon
Lee, Choon-Ki
Clark R. Wilson
Jianli Chen
Subject
Geochemistry & Geophysics
Keywords
Global change from geodesy; Satellite geodesy; Time variable gravity
Issue Date
2015
Citation
Seo, Ki-Weon, et al. 2015. "Decadal and quadratic variations of Earth's oblateness and polar ice mass balance from 1979 to 2010". GEOPHYSICAL JOURNAL INTERNATIONAL, 203(1): 475-481.
Abstract
Gravity variations associated with Earth’s oblateness (J2) have been observed by satellite laser ranging (SLR) since 1976. The J2 time-series has been used to measure and help understand many geophysical processes within the Earth system ranging from the mantle to the atmosphere. While post glacial rebound and the Earth climate system are believed to be the primary driving forces of long-termand seasonal J2 variations, the physical cause of decadal and longer timescale J2 variations has remained uncertain, although recent evidence indicates that polar ice mass changes are important. In this study, we estimate a variety of climate contributions to J2 over the period 1979?2010, and find that ice mass variations in Greenland and Antarctica are the dominant cause of observed decadal and longer J2 variations. Residual variations at periods near 10?11 years may reflect limitations of numerical climate models in estimating mass change variability at long periods, but are also suggestive of potential contribution related to variable solar activity.
URI
http://repository.kopri.re.kr/handle/201206/6019
DOI
http://dx.doi.org/doi:10.1093/gji/ggv312
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