An aerial view of 80 years of climate-related glacier fluctuations in southeast Greenland
An aerial view of 80 years of climate-related glacier fluctuations in southeast Greenland
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DOI：
10.1038/ngeo1481
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发表时间：
2012-06-01
影响因子：
18.3
通讯作者：
Funder, Svend
中科院分区：
文献类型：
--
作者：
Bjork, Anders A.;Kjaer, Kurt H.;Funder, Svend
格陵兰岛东南缘沿着观察到冰川广泛消退。这种撤退与空气和海洋温度升高有关。然而，大多数观测都来自卫星时代;格陵兰冰川的卫星前观测非常罕见。在这里，我们提出了一个独特的记录，记录了从20世纪30年代初开始重新发现的历史航空影像的格陵兰东南部132个冰川的正面位置。我们结合联合收割机的历史航空图像与早期和现代的卫星图像提取海洋和陆地终止出口冰川，以及当地的冰川和冰盖，在过去的80年的锋面变化。这些图像揭示了一个区域对外部强迫的反应，无论冰川类型、终端环境和大小如何。此外，最近的撤退在20世纪30年代的变暖时期与气温的上升相匹配。我们发现，许多陆地终止冰川在20世纪30年代比21世纪初经历了更快的退缩，而海洋终止冰川在最近的变暖过程中退缩得更快。
Widespread retreat of glaciers has been observed along the southeastern margin of Greenland. This retreat has been associated with increased air and ocean temperatures. However, most observations are from the satellite era; presatellite observations of Greenlandic glaciers are rare. Here we present a unique record that documents the frontal positions for 132 southeast Greenlandic glaciers from rediscovered historical aerial imagery beginning in the early 1930s. We combine the historical aerial images with both early and modern satellite imagery to extract frontal variations of marine-and land-terminating outlet glaciers, as well as local glaciers and ice caps, over the past 80 years. The images reveal a regional response to external forcing regardless of glacier type, terminal environment and size. Furthermore, the recent retreat was matched in its vigour during a period of warming in the 1930s with comparable increases in air temperature. We show that many land-terminating glaciers underwent a more rapid retreat in the 1930s than in the 2000s, whereas marine-terminating glaciers retreated more rapidly during the recent warming.