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Antarctic evidence for an abrupt northward shift of the Southern Hemisphere westerlies at 32 ka BP
Nature Communications ( IF 14.7 ) Pub Date : 2023-09-05 , DOI: 10.1038/s41467-023-40951-1
Abhijith U Venugopal 1, 2, 3 , Nancy A N Bertler 1, 2 , Jeffrey P Severinghaus 4 , Edward J Brook 5 , Giuseppe Cortese 1 , James E Lee 5 , Thomas Blunier 6 , Paul A Mayewski 7 , Helle A Kjær 6, 8 , Lionel Carter 2 , Michael E Weber 9 , Richard H Levy 1, 2 , Rebecca L Pyne 1 , Marcus J Vandergoes 1
Affiliation  

High-resolution ice core records from coastal Antarctica are particularly useful to inform our understanding of environmental changes and their drivers. Here, we present a decadally resolved record of sea-salt sodium (a proxy for open-ocean area) and non-sea salt calcium (a proxy for continental dust) from the well-dated Roosevelt Island Climate Evolution (RICE) core, focusing on the time period between 40–26 ka BP. The RICE dust record exhibits an abrupt shift towards a higher mean dust concentration at 32 ka BP. Investigating existing ice-core records, we find this shift is a prominent feature across Antarctica. We propose that this shift is linked to an equatorward displacement of Southern Hemisphere westerly winds. Subsequent to the wind shift, data suggest a weakening of Southern Ocean upwelling and a decline of atmospheric CO2 to lower glacial values, hence making this shift an important glacial climate event with potentially important insights for future projections.



中文翻译:

南极证据表明南半球西风带在 32ka BP 时突然北移

来自南极洲沿海的高分辨率冰芯记录对于我们了解环境变化及其驱动因素特别有用。在这里,我们展示了来自罗斯福岛气候演化 (RICE) 核心的海盐钠(代表公海区域)和非海盐钙(代表大陆尘埃)的十年解析记录,重点关注在 40-26 ka BP 之间的时间段。RICE 粉尘记录显示,在 32 ka BP 时,平均粉尘浓度突然转变为更高。通过调查现有的冰芯记录,我们发现这种转变是整个南极洲的一个显着特征。我们认为这种转变与南半球西风向赤道的位移有关。在风向转变之后,数据表明南大洋上升流减弱,大气中CO 2减少,从而降低冰川值,因此使这种转变成为重要的冰川气候事件,对未来的预测具有潜在的重要见解。

更新日期:2023-09-06
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