Glacier advance in southern middle-latitudes during the Antarctic Cold Reversal
Glacier advance in southern middle-latitudes during the Antarctic Cold Reversal
复制标题
南极冷逆转期间南部中纬度地区冰川推进
DOI：
10.1038/ngeo962
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发表时间：
2010
影响因子：
18.3
通讯作者：
Schlüchter, Christian
中科院分区：
文献类型：
--
作者：
Putnam, Aaron E.;Denton, George H.;Schaefer, Joerg M.;Barrell, David J.;Andersen, Bjørn G.;Finkel, Robert C.;Schwartz, Roseanne;Doughty, Alice M.;Kaplan, Michael R.;Schlüchter, Christian
在上次冰消期期间，南极洲的变暖因大约 14,540 年前至 12,760 年前恢复寒冷而中断。这一时期被称为南极寒冷逆转，在南极冰芯中有详细记录，但整个南半球变冷的地理范围仍不清楚。在这里，我们使用来自新西兰南阿尔卑斯山的两个冰川冰碛组的 10Be 表面暴露年龄来评估冰川前进是否与南极寒冷逆转有关。我们发现，大范围的冰川复苏在 13,000 年前达到顶峰，当时正是南极降温的高峰期。随后南阿尔卑斯山的冰川退缩，恰逢南极洲变暖。我们得出的结论是，与南极冷逆转相关的气候恶化延伸到了西南太平洋的南部中纬度地区。我们认为，大范围的变冷是由南副热带锋向北迁移以及随之而来的南大洋寒冷水域向北扩张造成的。
During the last deglaciation, warming over Antarctica was interrupted by a return to colder conditions from about 14,540 to 12,760 yr ago. This period, known as the Antarctic Cold Reversal, is well documented in Antarctic ice cores, but the geographic extent of the cooling throughout the Southern Hemisphere remains unclear. Here we use10Be surface-exposure ages from two glacial moraine sets from the Southern Alps, New Zealand, to assess whether the glacier advance was associated with the Antarctic Cold Reversal. We find that widespread glacier resurgence culminated 13,000 years ago, at the peak of Antarctic cooling. Subsequent glacier retreat in the Southern Alps coincided with warming in Antarctica. We conclude that the climate deterioration associated with the Antarctic Cold Reversal extended into the southern mid-latitudes of the southwestern Pacific Ocean. We suggest that the extensive cooling was caused by northward migration of the southern Subtropical Front, and concomitant northward expansion of cold Southern Ocean waters.