气候变化领域集成服务门户(CCPortal): Atmospheric Drivers of Melt on Larsen C Ice Shelf: Surface Energy Budget Regimes and the Impact of Foehn

CCPortal

DOI	10.1029/2020JD032463
	Atmospheric Drivers of Melt on Larsen C Ice Shelf: Surface Energy Budget Regimes and the Impact of Foehn
	Elvidge A.D.; Kuipers Munneke P.; King J.C.; Renfrew I.A.; Gilbert E.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	Recent ice shelf retreat on the east coast of the Antarctic Peninsula has been principally attributed to atmospherically driven melt. However, previous studies on the largest of these ice shelves—Larsen C—have struggled to reconcile atmospheric forcing with observed melt. This study provides the first comprehensive quantification and explanation of the atmospheric drivers of melt across Larsen C, using 31-months' worth of observations from Cabinet Inlet, a 6-month, high-resolution atmospheric model simulation and a novel approach to ascertain the surface energy budget (SEB) regime. The dominant meteorological controls on melt are shown to be the occurrence, strength, and warmth of mountain winds called foehn. At Cabinet Inlet, foehn occurs 15% of the time and causes 45% of melt. The primary effect of foehn on the SEB is elevated turbulent heat fluxes. Under typical, warm foehn conditions, this means elevated surface heating and melting, the intensity of which increases as foehn wind speed increases. Less commonly—due to cooler-than-normal foehn winds and/or radiatively warmed ice—the relationship between wind speed and net surface heat flux reverses. This explains the seemingly contradictory results of previous studies. In the model, spatial variability in cumulative melt across Larsen C is largely explained by foehn, with melt maxima in inlets reflecting maxima in foehn wind strength. However, most accumulated melt (58%) occurs due to solar radiation in the absence of foehn. A broad north-south gradient in melt is explained by the combined influence of foehn and non-foehn conditions. ©2020. The Authors.
英文关键词	foehn; ice shelf melt; Larsen C; Larsen Ice Shelf; surface energy balance; surface energy budget
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185789
作者单位	School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Institute for Marine and Atmospheric Research Utrecht, Utrecht, Netherlands; British Antarctic Survey, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Elvidge A.D.,Kuipers Munneke P.,King J.C.,et al. Atmospheric Drivers of Melt on Larsen C Ice Shelf: Surface Energy Budget Regimes and the Impact of Foehn[J],2020,125(17).
APA	Elvidge A.D.,Kuipers Munneke P.,King J.C.,Renfrew I.A.,&Gilbert E..(2020).Atmospheric Drivers of Melt on Larsen C Ice Shelf: Surface Energy Budget Regimes and the Impact of Foehn.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Elvidge A.D.,et al."Atmospheric Drivers of Melt on Larsen C Ice Shelf: Surface Energy Budget Regimes and the Impact of Foehn".Journal of Geophysical Research: Atmospheres 125.17(2020).