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Surface mass balance and ice flow of the glaciers Austre Lovénbreen and Pedersenbreen, Svalbard, Arctic

【标题】Surface mass balance and ice flow of the glaciers Austre Lovénbreen and Pedersenbreen, Svalbard, Arctic

【Title】Surface mass balance and ice flow of the glaciers Austre Lovénbreen and Pedersenbreen, Svalbard, Arctic

【作者】 徐明星; 闫明; 任贾文; 艾松涛; 康建成; 鄂栋臣

【Author】

【期刊】极地研究

【Journal】

【期刊年份】2010

【卷】Vol. 21

【期】

【关键词】 Svalbard; Glacier; Mass balance; Ice flow

【Keywords】 Svalbard; Glacier; Mass balance; Ice flow

【摘要】The glaciersAustre Lovénbreen and Pedersenbreen are located at Nylesund, Svalbard. The surface mass balance and ice flow velocity of both glaciers have been determined from the first year of observations (2005/2006), while the front edge of Austre Lovénbreen was also surveyed. The results are as follows:(1) The net mass balances of Austre Lovénbreen and Pedersenbreen are -0.44 and -0.20 m w.e., the annual ablation is -0.99 and -0.94 m w.e., and the corresponding equilibrium line altitudes are 478.10 and 494.87 m, respectively. (2) Austre Lovénbreen and Pedersenbreen are characterized as ice flow models of surge type glaciers in Svalbard. The horizontal vectors of the ice flow velocities are parallel or converge to the central lines of both glaciers, with lower velocities in the lower ablation areas and higher velocities in the middle and upper reaches of the glaciers. The vertical vectors of ice flow velocities show that there is a mass loss in the ablation areas, which reduces with increasing altitude, while there is a mass gain near the equilibrium line of Austre Lovénbreen. (3) The front edge of Austre Lovénbreen receded at an average rate of 21.83 m?a -1 , with remarkable variability a maximum rate of 77.30 m?a -1 and a minimum rate of 2.76 m?a -1 .

【Abstract】The glaciersAustre Lovénbreen and Pedersenbreen are located at Nylesund, Svalbard. The surface mass balance and ice flow velocity of both glaciers have been determined from the first year of observations (2005/2006), while the front edge of Austre Lovénbreen was also surveyed. The results are as follows:(1) The net mass balances of Austre Lovénbreen and Pedersenbreen are -0.44 and -0.20 m w.e., the annual ablation is -0.99 and -0.94 m w.e., and the corresponding equilibrium line altitudes are 478.10 and 494.87 m, respectively. (2) Austre Lovénbreen and Pedersenbreen are characterized as ice flow models of surge type glaciers in Svalbard. The horizontal vectors of the ice flow velocities are parallel or converge to the central lines of both glaciers, with lower velocities in the lower ablation areas and higher velocities in the middle and upper reaches of the glaciers. The vertical vectors of ice flow velocities show that there is a mass loss in the ablation areas, which reduces with increasing altitude, while there is a mass gain near the equilibrium line of Austre Lovénbreen. (3) The front edge of Austre Lovénbreen receded at an average rate of 21.83 m?a -1 , with remarkable variability a maximum rate of 77.30 m?a -1 and a minimum rate of 2.76 m?a -1 .

【基金/项目】

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