Variable relationship between accumulation and temperature in West Antarctica for the past 31,000 years
Variable relationship between accumulation and temperature in West Antarctica for the past 31,000 years
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DOI：
10.1002/2016gl068356
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发表时间：
2016-04-28
影响因子：
5.2
通讯作者：
Koutnik, Michelle
中科院分区：
文献类型：
--
作者：
Fudge, T. J.;Markle, Bradley R.;Koutnik, Michelle
南极洲对海平面的贡献是沿着边缘的冰损失和内部的冰积累之间的平衡。过去几十年的积累记录是嘈杂的，并显示出与温度的不一致关系。我们调查的积累和温度之间的关系，在过去的31 ka使用高分辨率记录从西南极冰盖（WAIS）划分冰芯在南极洲西部。尽管冰期-间冰期的增加导致了整个记录的高相关性和中等敏感性，但这种关系随着时间的推移表现出相当大的变化性，在0-8 ka时期具有高相关性和高敏感性，而在8-15 ka时期没有相关性。这与大气环流模式模拟形成对比，该模式模拟显示了整个时间段内温度和累积之间的均匀敏感性。这些结果表明，大气环流的变化是南极积累的重要驱动因素，但在模型模拟中没有充分捕捉到。应谨慎对待基于模型的未来南极积累预测及其对海平面的影响。
The Antarctic contribution to sea level is a balance between ice loss along the margin and accumulation in the interior. Accumulation records for the past few decades are noisy and show inconsistent relationships with temperature. We investigate the relationship between accumulation and temperature for the past 31 ka using high-resolution records from the West Antarctic Ice Sheet (WAIS) Divide ice core in West Antarctica. Although the glacial-interglacial increases result in high correlation and moderate sensitivity for the full record, the relationship shows considerable variability through time with high correlation and high sensitivity for the 0-8 ka period but no correlation for the 8-15 ka period. This contrasts with a general circulation model simulation which shows homogeneous sensitivities between temperature and accumulation across the entire time period. These results suggest that variations in atmospheric circulation are an important driver of Antarctic accumulation but they are not adequately captured in model simulations. Model-based projections of future Antarctic accumulation, and its impact on sea level, should be treated with caution.