气候变化领域集成服务门户(CCPortal): Climatology and Evolution of the Antarctic Peninsula Föhn Wind-Induced Melt Regime From 1979

CCPortal

DOI	10.1029/2020JD033682
	Climatology and Evolution of the Antarctic Peninsula Föhn Wind-Induced Melt Regime From 1979–2018
	Laffin M.K.; Zender C.S.; Singh S.; Van Wessem J.M.; Smeets C.J.P.P.; Reijmer C.H.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	Warm and dry föhn winds on the Antarctic Peninsula (AP) cause surface melt that can destabilize vulnerable ice shelves. Topographic funneling of these downslope winds through mountain passes and canyons can produce localized wind-induced melt that is difficult to quantify without direct measurements. Our Föhn Detection Algorithm (FöhnDA) identifies the surface föhn signature that causes melt from measurement by 12 Automatic Weather Stations on the AP, that train a machine learning model to detect föhn in 5 km Regional Atmospheric Climate Model 2 (RACMO2.3p2) simulations and in the ERA5 reanalysis model. We estimate the fraction of AP surface melt attributed to föhn and possibly katabatic winds and identify the drivers of melt, temporal variability, and long-term trends and evolution from 1979–2018. We find that föhn wind-induced melt accounts for 3.1% of the total melt on the AP and can be as high at 18% close to the mountains where the winds funnel through mountain canyons. Föhn-induced surface melt does not significantly increase from 1979–2018, despite a warmer atmosphere and more positive Southern Annular Mode. However, a significant increase (+0.1 Gt y-1) and subsequent decrease/stabilization occur in 1979–1998 and 1999–2018, consistent with the AP warming and cooling trends during the same time periods. Föhn occurrence, more than föhn strength, drives the annual variability in föhn-induced melt. Long-term föhn-induced melt trends and evolution are attributable to seasonal changes in föhn occurrence, with increased occurrence in summer, and decreased occurrence in fall, winter, and early spring over the past 20 years. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Föhn wind; ice shelf; surface energy budget; surface melt; Winter melt
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/185457
作者单位	Department of Earth System Science, University of California, Irvine, CA, United States; Department of Computer Science, University of California, Irvine, CA, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Laffin M.K.,Zender C.S.,Singh S.,等. Climatology and Evolution of the Antarctic Peninsula Föhn Wind-Induced Melt Regime From 1979–2018[J],2021,126(4).
APA	Laffin M.K.,Zender C.S.,Singh S.,Van Wessem J.M.,Smeets C.J.P.P.,&Reijmer C.H..(2021).Climatology and Evolution of the Antarctic Peninsula Föhn Wind-Induced Melt Regime From 1979–2018.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Laffin M.K.,et al."Climatology and Evolution of the Antarctic Peninsula Föhn Wind-Induced Melt Regime From 1979–2018".Journal of Geophysical Research: Atmospheres 126.4(2021).