DOI: 10.1038/s41561-020-0616-z
论文题名: Interannual variations in meltwater input to the Southern Ocean from Antarctic ice shelves
作者: Adusumilli S. ; Fricker H.A. ; Medley B. ; Padman L. ; Siegfried M.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 9 起始页码: 616
结束页码: 620
语种: 英语
英文关键词: annual variation
; climate effect
; deep water
; ice shelf
; ice thickness
; meltwater
; radar altimetry
; satellite altimetry
; sea level change
; temporal variation
; Antarctic Ice Sheet
; Antarctica
; Southern Ocean
英文摘要: Ocean-driven basal melting of Antarctica’s floating ice shelves accounts for about half of their mass loss in steady state, where gains in ice-shelf mass are balanced by losses. Ice-shelf thickness changes driven by varying basal melt rates modulate mass loss from the grounded ice sheet and its contribution to sea level, and the changing meltwater fluxes influence climate processes in the Southern Ocean. Existing continent-wide melt-rate datasets have no temporal variability, introducing uncertainties in sea level and climate projections. Here, we combine surface height data from satellite radar altimeters with satellite-derived ice velocities and a new model of firn-layer evolution to generate a high-resolution map of time-averaged (2010–2018) basal melt rates and time series (1994–2018) of meltwater fluxes for most ice shelves. Total basal meltwater flux in 1994 (1,090 ± 150 Gt yr–1) was similar to the steady-state value (1,100 ± 60 Gt yr–1), but increased to 1,570 ± 140 Gt yr–1 in 2009, followed by a decline to 1,160 ± 150 Gt yr–1 in 2018. For the four largest ‘cold-water’ ice shelves, we partition meltwater fluxes into deep and shallow sources to reveal distinct signatures of temporal variability, providing insights into climate forcing of basal melting and the impact of this melting on the Southern Ocean. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169544
Appears in Collections: 气候变化与战略
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作者单位: Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; Cryospheric Science Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth and Space Research, Corvallis, OR, United States; Department of Geophysics, Colorado School of Mines, Golden, CO, United States
Recommended Citation:
Adusumilli S.,Fricker H.A.,Medley B.,et al. Interannual variations in meltwater input to the Southern Ocean from Antarctic ice shelves[J]. Nature Geoscience,2020-01-01,13(9)