Antarctic surface temperature and elevation during the Last Glacial Maximum
Antarctic surface temperature and elevation during the Last Glacial Maximum
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DOI：
10.1126/science.abd2897
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发表时间：
2021-06-04
期刊：
影响因子：
56.9
通讯作者：
Schwander, Jakob
中科院分区：
文献类型：
--
作者：
Buizert, Christo;Fudge, T. J.;Schwander, Jakob
极地冰芯中的水稳定同位素是古气候重建中广泛使用的温度代理，但在东南极洲的校准仍然具有挑战性。在这里，我们利用钻孔测温和七个冰芯的冰雪特性重建了南极洲末次盛冰期表面冷却的幅度和空间模式。与工业化前时期相比，西南极地区的气温下降了约 10 摄氏度。南极东部站点显示出大约 4 摄氏度到大约 7 摄氏度的冷却范围，这与全球气候模型的结果一致，当包括冰芯空气含量数据表明的地形变化的影响时，但低于使用根据现代空间梯度校准的水稳定同位素表明的结果。冰川期南极逆温发生的变化使我们的估计与水同位素观测结果相一致。
Water-stable isotopes in polar ice cores are a widely used temperature proxy in paleoclimate reconstruction, yet calibration remains challenging in East Antarctica. Here, we reconstruct the magnitude and spatial pattern of Last Glacial Maximum surface cooling in Antarctica using borehole thermometry and firn properties in seven ice cores. West Antarctic sites cooled similar to 10 degrees C relative to the preindustrial period. East Antarctic sites show a range from similar to 4 degrees to similar to 7 degrees C cooling, which is consistent with the results of global climate models when the effects of topographic changes indicated with ice core air-content data are included, but less than those indicated with the use of water-stable isotopes calibrated against modern spatial gradients. An altered Antarctic temperature inversion during the glacial reconciles our estimates with water-isotope observations.