DOI: 10.5194/tc-14-2515-2020
论文题名: The contrasting response of outlet glaciers to interior and ocean forcing
作者: Christian J.E. ; Robel A.A. ; Proistosescu C. ; Roe G. ; Koutnik M. ; Christianson K.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 7 起始页码: 2515
结束页码: 2535
语种: 英语
英文关键词: climate change
; climate forcing
; glacier
; glacier mass balance
; glaciology
; grounding line
; ice sheet
英文摘要: The dynamics of marine-terminating outlet glaciers are of fundamental interest in glaciology and affect mass loss from ice sheets in a warming climate. In this study, we analyze the response of outlet glaciers to different sources of climate forcing. We find that outlet glaciers have a characteristically different transient response to surface-mass-balance forcing applied over the interior than to oceanic forcing applied at the grounding line. A recently developed reduced model represents outlet-glacier dynamics via two widely separated response timescales: a fast response associated with grounding-zone dynamics and a slow response of interior ice. The reduced model is shown to emulate the behavior of a more complex numerical model of ice flow. Together, these models demonstrate that ocean forcing first engages the fast, local response and then the slow adjustment of interior ice, whereas surface-mass-balance forcing is dominated by the slow interior adjustment. We also demonstrate the importance of the timescales of stochastic forcing for assessing the natural variability in outlet glaciers, highlighting that decadal persistence in ocean variability can affect the behavior of outlet glaciers on centennial and longer timescales. Finally, we show that these transient responses have important implications for attributing observed glacier changes to natural or anthropogenic influences; the future change already committed by past forcing; and the impact of past climate changes on the preindustrial glacier state, against which current and future anthropogenic influences are assessed. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164429
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States; Department of Atmospheric Sciences, University of Illinois, Urbana-Champaign, IL, United States; Department of Geology, University of Illinois, Urbana-Champaign, IL, United States
Recommended Citation:
Christian J.E.,Robel A.A.,Proistosescu C.,et al. The contrasting response of outlet glaciers to interior and ocean forcing[J]. Cryosphere,2020-01-01,14(7)