气候变化领域集成服务门户(CCPortal): Greenland Ice Sheet Elevation Change: Direct Observation of Process and Attribution at Summit

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DOI	10.1029/2020GL088864
	Greenland Ice Sheet Elevation Change: Direct Observation of Process and Attribution at Summit
	Hawley R.L.; Neumann T.A.; Stevens C.M.; Brunt K.M.; Sutterley T.C.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Greenland Ice Sheet surface elevation is changing as mass loss accelerates. In understanding elevation change, the magnitudes of physical processes involved are important for interpretation of altimetry and assessing changes in these processes. The four key processes are surface mass balance (SMB), firn densification, ice dynamics, and isostatic adjustment. We quantified these processes at Summit, Greenland, where monthly Global Navigation Satellite System (GNSS) snowmobile traverses measured elevation change from 2008 to 2018. We find an elevation increase of 0.019 m a−1. The sum of the effects of the four processes reproduces the measured elevation time series, in linear trend and in intra-annual variability. The short-term variability in elevation is primarily explained by the variability in SMB. Since SMB has not changed significantly over the last century, and the other processes change over longer time scales, the elevation change likely has been ongoing for at least the last 100 years. ©2020. The Authors.
英文关键词	Glacial geology; Glaciers; Global positioning system; Direct observations; Global Navigation Satellite Systems; Greenland Ice Sheet; Ice dynamics; Intra-annual variability; Linear trends; Physical process; Surface mass balance; Ice; annual variation; elevation; glacier mass balance; isostasy; observational method; satellite altimetry; Arctic; Greenland; Greenland Ice Sheet
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169384
作者单位	Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Now at Polar Science Center, Applied Physics LaboratoryUniversity of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Hawley R.L.,Neumann T.A.,Stevens C.M.,et al. Greenland Ice Sheet Elevation Change: Direct Observation of Process and Attribution at Summit[J],2020,47(22).
APA	Hawley R.L.,Neumann T.A.,Stevens C.M.,Brunt K.M.,&Sutterley T.C..(2020).Greenland Ice Sheet Elevation Change: Direct Observation of Process and Attribution at Summit.Geophysical Research Letters,47(22).
MLA	Hawley R.L.,et al."Greenland Ice Sheet Elevation Change: Direct Observation of Process and Attribution at Summit".Geophysical Research Letters 47.22(2020).