DOI: 10.5194/tc-9-1761-2015
Scopus记录号: 2-s2.0-84941056187
论文题名: Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance
作者: Bonin J ; A ; , Chambers D ; P
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 5 起始页码: 1761
结束页码: 1772
语种: 英语
英文关键词: annual variation
; error analysis
; glacier mass balance
; GRACE
; least squares method
; mass balance
; satellite data
; spatial resolution
; Arctic
; Greenland
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75250
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: College of Marine Science, University of South Florida, Tampa, FL, United States
Recommended Citation:
Bonin J,A,, Chambers D,et al. Quantifying the resolution level where the GRACE satellites can separate Greenland's glacial mass balance from surface mass balance[J]. Cryosphere,2015-01-01,9(5)