Intensified Southern Hemisphere Westerlies regulated atmospheric CO2 during the last deglaciation
Intensified Southern Hemisphere Westerlies regulated atmospheric CO2 during the last deglaciation
复制标题
DOI：
10.1130/g34335.1
复制
发表时间：
2013-08
期刊：
影响因子：
5.8
通讯作者：
C. Mayr;A. Lücke;S. Wagner;H. Wissel;C. Ohlendorf;T. Haberzettl;Markus Oehlerich;F. Schäbitz;M. Wille;J. Zhu;B. Zolitschka
中科院分区：
文献类型：
--
作者：
C. Mayr;A. Lücke;S. Wagner;H. Wissel;C. Ohlendorf;T. Haberzettl;Markus Oehlerich;F. Schäbitz;M. Wille;J. Zhu;B. Zolitschka
末次冰消期大气中CO 2 上升的原因很复杂，并且仍然是一个有争议的科学讨论问题。一种假说用深海释放的CO 2 来解释这一现象。南半球西风带（SHW）的变化或增强引起的大气-海洋相互作用的变化可能刺激了这一过程。在这里，使用巴塔哥尼亚湖泊沉积物中的水生纤维素的氧同位素比作为西风代理来检验这一假设。我们的记录表明，52°S 处的最大 SHW 强度在 13.4 和 11.3 校准凯尔 B.P 之间。这与新仙女木时区期间延伸至南部中纬度地区的纬向风强度的增加触发了最终的CO 2 增加相一致。与南半球其他记录的比较表明，当时加强的SHW向南迁移，导致间冰期CO 2 水平升高，从而终止末次冰期。
The causes for the rise of atmospheric CO 2 during the last deglaciation are complex and remain a matter of controversial scientific discussion. One hypothesis explains this phenomenon with CO 2 release from the deep ocean. A change in atmosphere-ocean interaction induced by a shift or intensification of Southern Hemisphere Westerlies (SHW) could have stimulated this process. Here this hypothesis is tested using oxygen isotope ratios of aquatic cellulose from Patagonian lacustrine sediments as west-wind proxy. Our record indicates maximum SHW strength at 52°S between 13.4 and 11.3 calibrated kyr B.P. This is in agreement with an increase in zonal wind strength extending to the southern mid-latitudes during the Younger Dryas chronozone triggering the final CO 2 increase. Comparison with other Southern Hemisphere records implies southward migration of strengthened SHW at that time, leading to interglacial CO 2 levels and hence terminating the Last Glacial.