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Global and arctic mean sea level variations observed by GRACE with the optimum ocean kernel

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Title
Global and arctic mean sea level variations observed by GRACE with the optimum ocean kernel
Other Titles
최적화된 커널을 이용한 전구 해수면 변화
Authors
Clark Wilson
Seo, Ki-Won
Park, No-Wook
Lee, Choon-Ki
Jianli Chen
Keywords
GRACE; Sea Level
Issue Date
2011
Citation
Clark Wilson, et al. 2011. Global and arctic mean sea level variations observed by GRACE with the optimum ocean kernel. 미국. 미국. 2011.12.08~.
Abstract
Understanding the causes of global mean sea level (MSL) variations is an emerging issue due to its link to climate change and socioeconomic impact. Recently, satellite altimetry and gravimetry observations have been used to understand the two different causes of MSL variations, which are due to mass (eustatic) and density (steric) changes. In particular, GRACE launched in 2002 has been recognized as a pivotal observation for MSL study because it directly measures ocean mass variations. To design ocean averaging kernels for GRACE MSL study is important because the terrestrial leakage error underestimates MSL variations and need to suppress the error via ocean averaging kernels. In this study, we develop an optimum ocean kernel based on terrestrial leakage and ocean signals from synthetic GRACE data that includes terrestrial water storage, ocean bottom pressure and glacier melting. In addition, the alias error is generated through GRACE along track observations. The optimum filter estimates seasonal and secular MSL variations better than other ocean kernels that have been examined previously. We apply the new optimum ocean kernel for the real GRACE data and compare results with altimeter based estimates. The trend and annual amplitude of global MSL variations are 2.37 mm/yr and 8.63 mm, respectively, from JPL solutions that provides the least difference compared to the altimeter based MSL. F
URI
http://repository.kopri.re.kr/handle/201206/8480
Conference Name
미국
Conference Place
미국
Conference Date
2011.12.08~
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