DOI: 10.1038/s41561-017-0033-0
论文题名: Response of Pacific-sector Antarctic ice shelves to the El Niño/Southern Oscillation
作者: Paolo F.S. ; Padman L. ; Fricker H.A. ; Adusumilli S. ; Howard S. ; Siegfried M.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 2 起始页码: 121
结束页码: 126
语种: 英语
Scopus关键词: accumulation
; atmospheric circulation
; basal melting
; climate change
; discharge
; El Nino-Southern Oscillation
; floating ice
; height
; ice shelf
; mass balance
; satellite altimetry
; Amundsen Sea
; Antarctica
; Pacific Ocean
; Ross Ice Shelf
; Southern Ocean
; West Antarctica
英文摘要: Satellite observations over the past two decades have revealed increasing loss of grounded ice in West Antarctica, associated with floating ice shelves that have been thinning. Thinning reduces an ice shelf's ability to restrain grounded-ice discharge, yet our understanding of the climate processes that drive mass changes is limited. Here, we use ice-shelf height data from four satellite altimeter missions (1994-2017) to show a direct link between ice-shelf height variability in the Antarctic Pacific sector and changes in regional atmospheric circulation driven by the El Niño/Southern Oscillation. This link is strongest from the Dotson to Ross ice shelves and weaker elsewhere. During intense El Niño years, height increase by accumulation exceeds the height decrease by basal melting, but net ice-shelf mass declines as basal ice loss exceeds ice gain by lower-density snow. Our results demonstrate a substantial response of Amundsen Sea ice shelves to global and regional climate variability, with rates of change in height and mass on interannual timescales that can be comparable to the longer-term trend, and with mass changes from surface accumulation offsetting a significant fraction of the changes in basal melting. This implies that ice-shelf height and mass variability will increase as interannual atmospheric variability increases in a warming climate. © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105611
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Earth and Space Research USA, Corvallis, OR, United States; Earth and Space Research, Seattle, WA, United States; Department of Geophysics, Stanford University, Palo Alto, CA, United States
Recommended Citation:
Paolo F.S.,Padman L.,Fricker H.A.,et al. Response of Pacific-sector Antarctic ice shelves to the El Niño/Southern Oscillation[J]. Nature Geoscience,2018-01-01,11(2)