尽管格陵兰冰盖变暖,但陆地终结部门的减速
Andrew J Tedstone1, Peter W Nienow1, Noel Gourmelen1
1School of GeoSciences, University of Edinburgh, Edinburgh EH8 9XP, UK.
Nature
|October 30, 2015
概括
格陵兰的融水增加并没有加速冰流. 这项研究发现,尽管融水增加了50%,但冰的运动却减慢了12%,这表明冰盖的弹性更强.
科学领域:
- 冰川学
- 气候科学
- 地球系统科学
背景情况:
- 在陆地边缘的冰流动力学受到地表融水的影响.
- 融水和冰床接口之间的水力动力学合可以暂时加快冰的运动.
- 融化水对冰流的十年级影响尚不清楚.
研究的目的:
- 研究水力动力学合对格陵兰冰盖陆地边缘运动的十年级影响.
- 评估表面融水产量的增加如何影响长时间的冰流.
主要方法:
- 分析格陵兰西冰盖边缘8000公里的年度冰运动数据.
- 1985年至1994年和2007年至2014年间的冰运动比较.
- 在研究期间表层融水产量变化的量化.
主要成果:
- 与1985年至1994年相比,2007年至2014年,每年冰的运动速度下降了12%.
- 尽管地表融水产量增加了50%,但这种减速仍然存在.
- 水力动力学合导致冰的运动在30多年内完全减缓.
结论:
- 与之前的假设相反,融水增加可能导致冰流在陆地边缘的净减速.
- 格陵兰冰盖的陆地终结边缘可能比以前假设的更适应增强的融水的动态影响.
- 预计气候变暖导致的融水增加可能会进一步减少这些部门的冰运动.
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