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Unprecedented Retreat in a 50-Year Observational Record for Petermann Glacier, North Greenland

Atmospheric and Oceanic Science Letters 2013年第5期6卷 259-265页

作者： Ola M. JOHANNESSEN Mohamed BABIKER Martin W. MILES Nansen Environmental and Remote Sensing Center Nansen Scientific Society Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Uni Research AS Bjerknes Centre for Climate Research

Petermann Glacier is a marine-terminating outlet glacier that had a 70 km-long floating ice tongue prior to a ～ 270 km2 calving event that was observed from satellite sensors in August 2010,shortening the ice tongue by ～ 27 ***,in July 2012,another 10 km was lost through *** order to understand these events in perspective,here the authors perform a long-term data analysis of Petermann Glacier calving-front variability and ice velocity for each year in the 1990s-2000s,supplemented by available observations from the previous three *** major （on the order of 100 krm2） calving events are identified,with ～ 153 km2 calved from 1959 to 1961,～ 168 km2 in 1991,～ 71 km2 in 2001,～ 270 km2 in 2010,and ～ 130 km2 in 2012-as well as ～ 31 k m2 calved in *** increased frequency of major calving events in recent years has left the front terminus position retreated nearly 25 km beyond the range of observed in previous *** contrast,stable ice-dynamics are suggested from ice-velocity measurements made each year between 1993-2012,which are on average 1063 m yr-1,with limited interannual variability and no significant trend; moreover,there is no apparent relationship between ice-velocity variability and calving *** degree to which the massive calving events in 2010 and 2012 represent natural episodic variability or a response to atmospheric and/or oceanic changes remains speculative; however,melt-induced weakening of the floating ice tongue in recent years is strongly suggested.

关键词： Greenland outlet glaciers iceberg calving satellite remote sensing

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