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Sensitivity of the Greenland Ice Sheet toPliocene sea surface temperatures

机译：格陵兰冰原对上新世海表温度的敏感性

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The history of the GrIS (Greenland Ice Sheet), particularly in warm climates of the pre-Quaternary, is poorly known. IRD (ice-rafted debris) records suggest that the ice sheet has existed, at least transiently, since the Miocene and potentially since as long ago as the Eocene. As melting of the GrIS is a key uncertainty in future predictions of climate and sea-level, understanding its behaviour and role within the climate system during past warm periods could provide important constraints. The Pliocene has been identified as a key period for understanding warmer than modern climates. Detailed micropalaeontological analyses of the mid-Piacenzian Warm Period (3.264 -3.025 Ma) have produced a series of SST (sea-surface temperature) reconstructions (PRISM2-AVE, PRISM2-MAX, PRISM2-MIN and PRISM3). Use of these different SSTs within the Hadley Centre GCM (General Circulation Model) and BASISM (British Antarctic Sur-vey Ice Sheet Model), consistently show large reductions of Pliocene Greenland ice volumes compared to modern. The changes in cli-mate introduced by the use of different SST reconstructions do change the predicted ice volumes, mainly through precipitation feedbacks. However, the models show a relatively low sensitivity of modelled Greenland ice volumes to different mid-Piacenzian SST reconstructions, with the largest SST induced changes being 20% of Pliocene ice volume or less than a metre of sea-level rise.
机译：GrIS（格陵兰冰原）的历史，尤其是在第四纪前的温暖气候中，鲜为人知。 IRD（冰河漂流的碎片）记录表明，自中新世以来，冰盖至少已经短暂存在，并且可能早于始新世就存在。由于GrIS的融化是未来气候和海平面预测中的关键不确定因素，因此了解其过去温暖期在气候系统中的行为和作用可能会提供重要的限制。上新世被认为是了解比现代气候更温暖的关键时期。对Piacenzian中期（3.264 -3.025 Ma）进行的详细古古生物学分析已经产生了一系列的SST（海表温度）重建（PRISM2-AVE，PRISM2-MAX，PRISM2-MIN和PRISM3）。在Hadley中心GCM（通用循环模型）和BASISM（英国南极调查冰盖模型）中使用这些不同的SST，始终显示出与现代相比，上新世格陵兰岛的冰量减少了很多。通过使用不同的SST重建而引入的气候变化确实会改变降水量，主要是通过降水反馈来改变。但是，这些模型显示，模型格陵兰岛的冰量对不同的Piacenzian中期SST重建的敏感性相对较低，最大的SST诱发变化为上新世冰量的20％或不到一米的海平面上升。

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