Observed glacial changes on the King George Island ice cap, Antarctica, in the last decade
Observed glacial changes on the King George Island ice cap, Antarctica, in the last decade
复制标题
DOI：
10.1016/j.gloplacha.2011.06.009
复制
发表时间：
2011-10-01
影响因子：
3.9
通讯作者：
Blindow, N.
中科院分区：
文献类型：
--
作者：
Rueckamp, M.;Braun, M.;Blindow, N.
南极半岛已被确定为一个快速持续气候变化的地区，对冰冻圈产生影响。对冰川变化和冰川融化加剧造成的淡水收支的了解是许多生物和综合地球系统科学方法的重要边界条件。我们提供了一个案例研究的冰川和质量平衡的变化国王乔治岛的冰帽。2000年至2008年之间的面积损失约为20平方公里（约占岛屿面积的1.6%），与前几年观察到的冰川退缩速度相比。两年（2007年和2008年）测量的净积累率显示出很强的年际变化，最大净积累率为4950毫米w.e.。a（-1）和3184 mm w.e. a（-1）。这些净积累率至少比冰芯报告的平均值（1926-95年）高4倍。海拔依赖的降水率为343毫米w.e. a（-1）（2007）和432 mm we.观察到每100 m海拔增加（-1）（2008）。尽管这些相当高的净积累率的主要冰帽，一致的表面降低，观察到在海拔低于270米以上的椭球超过11年的时间。这些DGPS记录揭示了地表下沉与海拔高度的线性关系，最大年地表下沉速率在椭球面上方40 m处为1.44 ma（-1），在270 m处为-0.20 ma（-1）。这些结果与其他作者的观测结果和ICESat激光高度计测得的地表下降速率吻合得很好。假设过去11年的气候条件继续下去，贝灵斯高晋穹丘的小冰帽将在大约285年后消失。(C)2011爱思唯尔有限公司版权所有。
The Antarctic Peninsula has been identified as a region of rapid on-going climate change with impacts on the cryosphere. The knowledge of glacial changes and freshwater budgets resulting from intensified glacier melt is an important boundary condition for many biological and integrated earth system science approaches. We provide a case study on glacier and mass balance changes for the ice cap of King George Island. The area loss between 2000 and 2008 amounted to about 20 km(2) (about 1.6% of the island area) and compares to glacier retreat rates observed in previous years. Measured net accumulation rates for two years (2007 and 2008) show a strong interannual variability with maximum net accumulation rates of 4950 mm w.e. a(-1) and 3184 mm w.e. a(-1), respectively. These net accumulation rates are at least 4 times higher than reported mean values (1926-95) from an ice core. An elevation dependent precipitation rate of 343 mm w.e. a(-1) (2007) and 432 mm we. a(-1) (2008) per 100 m elevation increase was observed. Despite these rather high net accumulation rates on the main ice cap, consistent surface lowering was observed at elevations below 270 m above ellipsoid over an 11-year period. These DGPS records reveal a linear dependence of surface lowering with altitude with a maximum annual surface lowering rate of 1.44 ma(-1) at 40 m and -0.20 ma(-1) at 270 m above ellipsoid. These results fit well to observations by other authors and surface lowering rates derived from the ICESat laser altimeter. Assuming that climate conditions of the past 11 years continue, the small ice cap of Bellingshausen Dome will disappear in about 285 years. (C) 2011 Elsevier B.V. All rights reserved.