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《Chinese Journal of Polar Research》 2010-01
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THE STUDIES OF SURFACE MASS BALANCE AND ICE FLOW ON GLACIERS AUSTRELOVéNBREEN AND PEDERSENBREEN,SVALBARD,ARCTIC

Xu Mingxing1,2, Yan Ming1, Ren Jiawen3, Ai Songtao4, Kang Jiancheng 2 and E Dongchen4(1 SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China;2 Urban-ecology and Environmental Restore Central of Shanghai Normal University, Shanghai 200234, China;3 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;4 Chinese Antarctic Center of Surveying and Mapping, SGG, Wuhan University, Wuhan 430079, China)  
The glaciers Austre Lovénbreen and Pedersenbreen are located at Ny-lesund, Svalbard. Based on the observation of first year (2005/2006), surface mass balance and ice flow velocity of both glaciers have been analysed, while the front edge of Austre Lovénbreen has also been surveyed. The results are as following: (1) The net mass balance of Austre Lovénbreen and Pedersenbreen is -0.44 and -0.20 m w.e., respectively. Their annual ablation is -0.99 and -0.94 m w.e., respectively, and corresponding ELA is 478.10 and 494.87m, respectively. (2) Austre Lovénbreen and Pedersenbreen are characterized as ice flow model of surge-type glaciers in Svalbard. The level vectors of ice flow velocity are parallel or converge to the central lines of both glaciers, with slower velocities at the lower ablation area and relatively faster ones at the middle and upper part of glaciers. The mean, maximum and minimum of ice flow velocities on Austre Lovénbreen are 2.28, 3.91 and 0.81 m·a-1, and Pedersenbreen's are 6.74, 8.13 and 5.49 m·a-1. The vertical vectors of ice flow velocity show that there is a mass loss in the ablation area, which weakness with the increase of altitude, while there exists a mass gain near ELA on Austre Lovénbreen. The actual vertical displacement is in accord with the general pattern that motion is downward in the accumulation area, and is, by contrast, upward in the ablation area. (3) The front edge of Austre Lovénbreen has receded at an average rate of 21.83 m.a-1, with maximum 77.30 m.a-1 and minimum 2.76 m.a-1.
【Fund】: 国家自然科学基金(40876098);; 国家海洋局极地考察办公室北极考察项目资助
【CateGory Index】: P343.6
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