气候变化领域集成服务门户(CCPortal): Recent precipitation decrease across the western Greenland ice sheet percolation zone

CCPortal

DOI	10.5194/tc-13-2797-2019
	Recent precipitation decrease across the western Greenland ice sheet percolation zone
	Lewis G.; Osterberg E.; Hawley R.; Peter Marshall H.; Meehan T.; Graeter K.; McCarthy F.; Overly T.; Thundercloud Z.; Ferris D.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2797
结束页码	2815
卷号	13 期号:11
英文摘要	The mass balance of the Greenland Ice Sheet (GrIS) in a warming climate is of critical interest in the context of future sea level rise. Increased melting in the GrIS percolation zone due to atmospheric warming over the past several decades has led to increased mass loss at lower elevations. Previous studies have hypothesized that this warming is accompanied by a precipitation increase, as would be expected from the Clausius-Clapeyron relationship, compensating for some of the melt-induced mass loss throughout the western GrIS. This study tests that hypothesis by calculating snow accumulation rates and trends across the western GrIS percolation zone, providing new accumulation rate estimates in regions with sparse in situ data or data that do not span the recent accelerating surface melt. We present accumulation records from sixteen 22-32 m long firn cores and 4436 km of ground-penetrating radar, covering the past 20-60 years of accumulation, collected across the western GrIS percolation zone as part of the Greenland Traverse for Accumulation and Climate Studies (GreenTrACS) project. Trends from both radar and firn cores, as well as commonly used regional climate models, show decreasing accumulation rates of 2.4±1.5 % a-1 over the 1996-2016 period, which we attribute to shifting storm tracks related to stronger atmospheric summer blocking over Greenland. Changes in atmospheric circulation over the past 20 years, specifically anomalously strong summertime blocking, have reduced GrIS surface mass balance through both an increase in surface melting and a decrease in accumulation rates. © 2019 Author(s).
学科领域	climate modeling; elevation; glacier mass balance; ground penetrating radar; percolation; precipitation (climatology); sea level change; snow accumulation; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	climate modeling; elevation; glacier mass balance; ground penetrating radar; percolation; precipitation (climatology); sea level change; snow accumulation; Arctic; Greenland; Greenland Ice Sheet
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118818
作者单位	Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Geosciences Department, Boise State University, Boise, ID, United States; Office of Sustainability, University of Maine, Orono, ME, United States; College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, United States; NASA Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Lewis G.,Osterberg E.,Hawley R.,et al. Recent precipitation decrease across the western Greenland ice sheet percolation zone[J],2019,13(11).
APA	Lewis G..,Osterberg E..,Hawley R..,Peter Marshall H..,Meehan T..,...&Ferris D..(2019).Recent precipitation decrease across the western Greenland ice sheet percolation zone.The Cryosphere,13(11).
MLA	Lewis G.,et al."Recent precipitation decrease across the western Greenland ice sheet percolation zone".The Cryosphere 13.11(2019).