Impact of reduced Arctic sea ice on Greenland ice sheet variability in a warmer than present climate
Impact of reduced Arctic sea ice on Greenland ice sheet variability in a warmer than present climate
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DOI：
10.1002/2014gl059770
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发表时间：
2014-06
影响因子：
5.2
通讯作者：
S. Koenig;R. DeConto;D. Pollard
中科院分区：
文献类型：
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作者：
S. Koenig;R. DeConto;D. Pollard
利用一个具有相互作用植被和耦合冰架分量的全球气候模型，测试了上新世中期（~ 3 Ma）格陵兰冰盖（GIS）对海面温度升高（SSTs）和海冰（SI）覆盖减少的响应。研究表明，北极和北大西洋的季节性开阔水域改变了区域辐射收支、风暴路径以及进入格陵兰岛内部的湿热平流，而主导冰盖响应的是温度的升高而不是降水。当应用于最初被冰川覆盖的格陵兰岛时，假定的温暖、无冰的上新世海洋条件会导致几乎整个冰盖的快速融化，并阻止类似现代的GIS（再）生长，无论轨道强迫如何。格陵兰岛对强加的上新世海洋条件的敏感性可能对冰盖对北极盆地持续变暖的未来反应产生严重影响。
A global climate model with interactive vegetation and a coupled ice sheet‐shelf component is used to test the response of the Greenland ice sheet (GIS) to increased sea surface temperatures (SSTs) and reduced sea ice (SI) cover during the mid‐Pliocene warm period (∼3 Ma) as reconstructed from proxy records. Seasonally open water in the Arctic and North Atlantic are shown to alter regional radiation budgets, storm tracks, and moisture and heat advection into the Greenland interior, with increases in temperature rather than precipitation dominating the ice sheets response. When applied to an initially glaciated Greenland, the presumed warm, ice‐free Pliocene ocean conditions induce rapid melting of nearly the entire ice sheet and preclude a modern‐like GIS from (re)growing, regardless of orbital forcing. The sensitivity of Greenland to imposed Pliocene ocean conditions may have serious implications for the future response of the ice sheet to continued warming in the Arctic basin.