气候变化领域集成服务门户(CCPortal): Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance

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DOI	10.5194/tc-9-1761-2015
	Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance
	Bonin J.A.; Chambers D.P.
发表日期	2015
ISSN	19940416
卷号	9 期号:5
英文摘要	Mass change over Greenland can be caused by either changes in the glacial dynamic mass balance (DMB) or the surface mass balance (SMB). The GRACE satellite gravity mission cannot directly separate the two physical causes because it measures the sum of the entire mass column with limited spatial resolution. We demonstrate one theoretical way to indirectly separate cumulative SMB from DMB with GRACE, using a least squares inversion technique with knowledge of the location of the glaciers. However, we find that the limited 60 × 60 spherical harmonic representation of current GRACE data does not provide sufficient resolution to adequately accomplish the task. We determine that at a maximum degree/order of 90 × 90 or above, a noise-free gravity measurement could theoretically separate the SMB from DMB signals. However, current GRACE satellite errors are too large at present to separate the signals. A noise reduction of a factor of 10 at a resolution of 90 × 90 would provide the accuracy needed for the interannual cumulative SMB and DMB to be accurately separated. © 2015 Author(s).
学科领域	annual variation; error analysis; glacier mass balance; GRACE; least squares method; mass balance; satellite data; spatial resolution; Arctic; Greenland
语种	英语
scopus关键词	annual variation; error analysis; glacier mass balance; GRACE; least squares method; mass balance; satellite data; spatial resolution; Arctic; Greenland
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119820
作者单位	College of Marine Science, University of South Florida, Tampa, FL, United States
推荐引用方式 GB/T 7714	Bonin J.A.,Chambers D.P.. Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance[J],2015,9(5).
APA	Bonin J.A.,&Chambers D.P..(2015).Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance.Cryosphere,9(5).
MLA	Bonin J.A.,et al."Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance".Cryosphere 9.5(2015).