Detailed ice loss pattern in the northern Antarctic Peninsula: widespread decline driven by ice front retreats

Detailed ice loss pattern in the northern Antarctic Peninsula: widespread decline driven by ice front retreats
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南极半岛北部详细的冰损失模式:冰锋退缩导致广泛的冰损失

DOI:
10.5194/tc-8-2135-2014
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发表时间:
2014
期刊:
The Cryosphere
影响因子:
--
通讯作者:
J. Bohlander
J. Bohlander
中科院分区:
--
文献类型:
--
作者:
T. Scambos;E. Berthier;T. Haran;C. Shuman;A. Cook;S. Ligtenberg;J. Bohlander

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南极北方半岛(nAP,< 66 S)是地球上冰川变化最快的地区之一,但其冰川流域尺度上的冰量损失的空间格局迄今为止还缺乏文献记载。我们使用2001-2010年(主要是2003-2008年)的卫星激光测高和卫星立体图像地形图,绘制了覆盖大陆和大多数大岛屿的33个冰川盆地的冰高程变化图,并推断了质量变化。冰体积和冰质量的变化速率分别为27.7± 8.6km3a1和24.9± 7.8Gta1,相当于0.73ma1w.e.对于研究领域。1995年和2002年受主要冰架崩溃影响的东部冰川的质量损失最高,其中12个冰川占总不平衡的60%。然而,尽管沿西海岸和山脊沿着的积雪增加,但在整个北大西洋行动方案中,在高海拔和低海拔地区,损失率都较小。我们解释了广泛的质量损失是由几十年的冰锋后退两侧的nAP驱动,并扩展到整个冰盖由于运动学波的传播触发的前线到内部。
The northern Antarctic Peninsula (nAP, < 66 S) is one of the most rapidly changing glaciated regions on earth, yet the spatial patterns of its ice mass loss at the glacier basin scale have to date been poorly documented. We use satellite laser altimetry and satellite stereo-image topography span- ning 2001-2010, but primarily 2003-2008, to map ice eleva- tion change and infer mass changes for 33 glacier basins cov- ering the mainland and most large islands in the nAP. Rates of ice volume and ice mass change are 27.7± 8.6 km 3 a 1 and 24.9±7.8 Gt a 1 , equal to 0.73 m a 1 w.e. for the study area. Mass loss is the highest for eastern glaciers affected by major ice shelf collapses in 1995 and 2002, where twelve glaciers account for 60 % of the total imbalance. However, losses at smaller rates occur throughout the nAP, at both high and low elevation, despite increased snow accumula- tion along the western coast and ridge crest. We interpret the widespread mass loss to be driven by decades of ice front re- treats on both sides of the nAP, and extended throughout the ice sheet due to the propagation of kinematic waves triggered at the fronts into the interior.
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