DOI: 10.1175/JCLI-D-18-0024.1
Scopus记录号: 2-s2.0-85048503191
论文题名: Bias in estimates of global mean sea level change inferred from satellite altimetry
作者: Lickley M.J. ; Hay C.C. ; Tamisiea M.E. ; Mitrovica J.X.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 13 起始页码: 5263
结束页码: 5271
语种: 英语
英文关键词: Altimetry
; Sea level
Scopus关键词: Aneroid altimeters
; Climate change
; Geodetic satellites
; Glacial geology
; Glaciers
; Ice
; Surface waters
; Tectonics
; Tide gages
; Altimetry
; Antarctic ice sheets
; Crustal deformations
; Global mean sea levels
; Greenland Ice Sheet
; Relative contribution
; Relative sea-level changes
; Satellite altimetry
; Sea level
; climate change
; estimation method
; ice sheet
; satellite altimetry
; sea level change
; sea surface height
; tide gauge
; Antarctic Ice Sheet
; Antarctica
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Estimates of regional and global average sea level change remain a focus of climate change research. One complication in obtaining coherent estimates is that geodetic datasets measure different aspects of the sea level field. Satellite altimetry constrains changes in the sea surface height (SSH; or absolute sea level), whereas tide gauge data provide a measure of changes in SSH relative to the crust (i.e., relative sea level). The latter is a direct measure of changes in ocean volume (and the combined impacts of ice sheet melt and steric effects), but the former is not since it does not account for crustal deformation. Nevertheless, the literature commonly conflates the two estimates by directly comparing them. We demonstrate that using satellite altimetry records to estimate global ocean volume changes can lead to biases that can exceed 15%. The level of bias will depend on the relative contributions to sea level changes from the Antarctic and Greenland Ice Sheets. The bias is also more sensitive to the detailed geometry of mass flux from the Antarctic Ice Sheet than the Greenland Ice Sheet due to rotational effects on sea level. Finally, in a regional sense, altimetry estimates should not be compared to relative sea level changes because radial crustal motions driven by polar ice mass flux are nonnegligible globally. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111483
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Earth and Environmental Sciences, Boston College, Boston, MA, United States; Center for Space Research, The University of Texas at Austin, Austin, TX, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Lickley M.J.,Hay C.C.,Tamisiea M.E.,et al. Bias in estimates of global mean sea level change inferred from satellite altimetry[J]. Journal of Climate,2018-01-01,31(13)