气候变化领域集成服务门户(CCPortal): Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics

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DOI	10.1073/pnas.1411680112
	Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics
	Csatho B.M.; Schenka A.F.; Van Der Veen C.J.; Babonis G.; Duncan K.; Rezvanbehbahani S.; Van Den Broeke M.R.; Simonsen S.B.; Nagarajan S.; Van Angelen J.H.
发表日期	2014
ISSN	0027-8424
起始页码	18478
结束页码	18483
卷号	111 期号:52
英文摘要	We present a new record of ice thickness change, reconstructed at nearly 100,000 sites on the Greenland Ice Sheet (GrIS) from laser altimetry measurements spanning the period 1993-2012, partitioned into changes due to surface mass balance (SMB) and ice dynamics. We estimate a mean annual GrIS mass loss of 243 ± 18 Gt·y-1, equivalent to 0.68 mm·y-1 sea level rise (SLR) for 2003-2009. Dynamic thinning contributed 48%, with the largest rates occurring in 2004-2006, followed by a gradual decrease balanced by accelerating SMB loss. The spatial pattern of dynamic mass loss changed over this time as dynamic thinning rapidly decreased in southeast Greenland but slowly increased in the southwest, north, and northeast regions. Most outlet glaciers have been thinning during the last two decades, interrupted by episodes of decreasing thinning or even thickening. Dynamics of the major outlet glaciers dominated the mass loss from larger drainage basins, and simultaneous changes over distances up to 500 km are detected, indicating climate control. However, the intricate spatiotemporal pattern of dynamic thickness change suggests that, regardless of the forcing responsible for initial glacier acceleration and thinning, the response of individual glaciers is modulated by local conditions. Recent projections of dynamic contributions from the entire GrIS to SLR have been based on the extrapolation of four major outlet glaciers. Considering the observed complexity, we question how well these four glaciers represent all of Greenland's outlet glaciers. © 2014, National Academy of Sciences. All rights reserved.
英文关键词	Greenland Ice Sheet; Ice dynamics; Laser altimetry; Mass balance
语种	英语
scopus关键词	acceleration; Article; climate; glacial mass balance; Greenland; ice sheet; laser altimetry; measurement; priority journal; sea level rise; surface property; thickness
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158915
作者单位	Csatho, B.M., Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Schenka, A.F., Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Van Der Veen, C.J., Department of Geography, University of Kansas, Lawrence, KS 66045, United States; Babonis, G., Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Duncan, K., Department of Geology, University at Buffalo, Buffalo, NY 14260, United States; Rezvanbehbahani, S., Department of Geology, University of Kansas LawrenceKS 66045, United States; Van Den Broeke, M.R., Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, 3584 CC, Netherlands; Simonsen, S.B., Division of Geodynamics, DTU Space, National Space Institute, Kgs. Lyngby, DK-2800, Denmark; Nagarajan, S., Department of Civil, Environmental and Geomatics Engineering, Florida Atlantic University, Boca Raton, FL 33431, United States; Van Angelen, J.H., Institute for Marine and Atmospheric Research, U...
推荐引用方式 GB/T 7714	Csatho B.M.,Schenka A.F.,Van Der Veen C.J.,et al. Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics[J],2014,111(52).
APA	Csatho B.M..,Schenka A.F..,Van Der Veen C.J..,Babonis G..,Duncan K..,...&Van Angelen J.H..(2014).Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics.Proceedings of the National Academy of Sciences of the United States of America,111(52).
MLA	Csatho B.M.,et al."Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics".Proceedings of the National Academy of Sciences of the United States of America 111.52(2014).