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Current Ice Loss in Small Glacier Systems of the Arctic Islands (Iceland, Svalbard, and the Russian High Arctic) from Satellite Gravimetry

机译:卫星重力法在北极群岛(冰岛,斯瓦尔巴特群岛和俄罗斯高北极地区)的小型冰川系统中当前的冰损失

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摘要

Recent climate changes have brought about significant ice sheets and glacier melting in many parts of the world. Satellite gravimetry by the Gravity Recovery and Climate Experiment (GRACE) revealed that such ice melting also occurs in small glacier systems in the Arctic region, i.e., Iceland, Svalbard, and the Russian High Arctic. Using monthly gravity solutions from GRACE during 2004.02 - 2012.01, we obtained the average ice loss rates of 10.9 ± 2.1, 3.6 ± 2.9, and 6.9 ± 7.4 Gt yr-1, for these three glacial systems, respectively. The total ice loss rate is 21.4 ± 12.4 Gt yr-1, about twice as fast as the average rate over a ~40 years interval before the studied period. We found that the ice loss rates in Svalbard and Novaya Zemlya, in the Russian High Arctic, had significant temporal variability, showing decreasing trend before 2008 and increasing trend around the winter of 2009/2010, respectively. Due to such variability, the total ice loss rate becomes as high as 32.9 ± 19.2 Gt yr-1 during 2004.02 - 2008.01. Such variability in the rate might reflect the strong negative Arctic Oscillation (AO) in the northern hemisphere winter of 2009/2010.
机译:最近的气候变化在世界许多地方带来了明显的冰盖和冰川融化。通过重力恢复和气候实验(GRACE)进行的卫星重力分析表明,这种冰融化也发生在北极地区的小冰川系统中,即冰岛,斯瓦尔巴特群岛和俄罗斯高北极地区。在2004.02年至2012.01年期间,使用GRACE的月度重力解,我们得出这三个冰川系统的平均失冰率分别为10.9±2.1、3.6±2.9和6.9±7.4 Gt yr-1。冰的总流失率为21.4±12.4 Gt yr-1,大约是研究期之前约40年间隔内平均流失速度的两倍。我们发现,俄罗斯高北极地区的斯瓦尔巴特群岛和诺瓦亚·泽姆利亚的冰流失率具有明显的时间变化,分别显示2008年之前的下降趋势和2009/2010年冬季前后的上升趋势。由于这种可变性,在2004.02-2008.01期间,总冰块流失率高达32.9±19.2 Gt yr-1。这种速率的变化可能反映了北半球2009/2010年冬季强烈的北极涛动(AO)。

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    Matsuo, Koji; Heki, Kosuke;

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  • 年度 2013
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