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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Antarctic lakes suggest millennial reorganizations of Southern Hemisphere atmospheric and oceanic circulation
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Antarctic lakes suggest millennial reorganizations of Southern Hemisphere atmospheric and oceanic circulation

机译:南极湖泊表明南半球大气和海洋环流的千年重组

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摘要

The phasing of millennial-scale oscillations in Antarctica relative to those elsewhere in the world is important for discriminating among models for abrupt climate change, particularly those involving the Southern Ocean. However, records of millennial-scale variability from Antarctica dating to the last glacial maximum are rare and rely heavily on data from widely spaced ice cores, some of which show little variability through that time. Here, we present new data from closed-basin lakes in the Dry Valleys region of East Antarctica that show high-magnitude, high-frequency oscillations in surface level during the late Pleistocene synchronous with climate fluctuations elsewhere in the Southern Hemisphere. These data suggest a coherent Southern Hemisphere pattern of climate change on millennial time scales, at least in the Pacific sector, and indicate that any hypothesis concerning the origin of these events must account for synchronous changes in both high and temperate latitudes.
机译:相较于世界其他地方,南极洲的千年规模振荡定相对于区分突然的气候变化模型,特别是涉及南大洋的模型具有重要意义。但是,从南极洲到最后一个冰川最大值的千年尺度变化的记录很少,并且严重依赖于间隔较大的冰芯的数据,其中一些数据在这段时间内几乎没有变化。在这里,我们提供了来自南极东部干旱谷地区的封闭盆地湖泊的新数据,这些数据显示了晚更新世期间地表水平的高幅,高频振荡以及南半球其他地方的气候波动。这些数据表明,至少在太平洋地区,千年发展的南半球气候变化模式是一致的,至少在太平洋地区,这表明有关这些事件起源的任何假设都必须说明高纬度和温带纬度的同步变化。

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