DOI: 10.5194/tc-8-623-2014
Scopus记录号: 2-s2.0-84898624170
论文题名: Surge dynamics in the nathorstbreen glacier system, Svalbard
作者: Sund M ; , Lauknes T ; R ; , Eiken T
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 623
结束页码: 638
语种: 英语
英文关键词: 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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74865
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Sund M,, Lauknes T,R,et al. Surge dynamics in the nathorstbreen glacier system, Svalbard[J]. Cryosphere,2014-01-01,8(2)