气候变化领域集成服务门户(CCPortal): Surge dynamics in the nathorstbreen glacier system, Svalbard

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DOI	10.5194/tc-8-623-2014
	Surge dynamics in the nathorstbreen glacier system, Svalbard
	Sund M.; Lauknes T.R.; Eiken T.
发表日期	2014
ISSN	19940416
卷号	8 期号:2
英文摘要	Nathorstbreen glacier system (NGS) recently experienced the largest surge in Svalbard since 1936, and this was examined using spatial and temporal observations from DEM differencing, time series of surface velocities from satellite synthetic aperture radar (SAR) and other sources. The upper basins with maximum accumulation during quiescence corresponded to regions of initial lowering. Initial speed-up exceeded quiescent velocities by a factor of several tens. This suggests that polythermal glacier surges are initiated in the temperate area before mass is displaced downglacier. Subsequent downglacier mass displacement coincided with areas where glacier velocity increased by a factor of 100-200 times (stage 2). After more than 5 years, the joint NGS terminus advanced abruptly into the fjord during winter, increasing velocities even more. The advance was followed by up-glacier propagation of crevasses, indicating the middle and subsequently the upper part of the glaciers reacting to the mass displacement. NGS advanced ∼15 km, while another ∼3 km length was lost due to calving. Surface lowering of ∼50 m was observed in some up-glacier areas, and in 5 years the total glacier area increased by 20%. Maximum measured flow rates were at least 25 m dg-1, 2500 times quiescent velocity, while average velocities were about 10 m dg-1. The surges of Zawadzkibreen cycle with ca. 70-year periods. © 2014 Author(s).
学科领域	cryosphere; digital elevation model; glacier dynamics; glacier mass balance; glacier surge; glaciology; iceberg calving; synthetic aperture radar; Arctic; Nathorstbreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	cryosphere; digital elevation model; glacier dynamics; glacier mass balance; glacier surge; glaciology; iceberg calving; synthetic aperture radar; Arctic; Nathorstbreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120130
作者单位	Hydrology Department, Norwegian Water Resources and Energy Directorate, P.O. Box 5091, Majorstuen 0301 Oslo, Norway; University Centre in Svalbard, P.O. Box 156, 9171 Longyearbyen, Norway; NORUT, P.O. Box 6434, Forskningsparken, 9294 Tromsø, Norway; Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway
推荐引用方式 GB/T 7714	Sund M.,Lauknes T.R.,Eiken T.. Surge dynamics in the nathorstbreen glacier system, Svalbard[J],2014,8(2).
APA	Sund M.,Lauknes T.R.,&Eiken T..(2014).Surge dynamics in the nathorstbreen glacier system, Svalbard.Cryosphere,8(2).
MLA	Sund M.,et al."Surge dynamics in the nathorstbreen glacier system, Svalbard".Cryosphere 8.2(2014).