Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation
Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation
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DOI：
10.1002/2017pa003084
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发表时间：
2017-06-01
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影响因子：
--
通讯作者：
Zhang, Yancheng
中科院分区：
文献类型：
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作者：
Mulitza, Stefan;Chiessi, Cristiano M.;Zhang, Yancheng
与大西洋纬向翻转环流（AMOC）强度波动相关的热输送变化被广泛认为会影响热带辐合带（ITCZ）的位置，但这种遥相关的时间直接性迄今尚未得到解决。基于高分辨率的海洋沉积物序列在最后一个冰消期，我们提供的证据，在大西洋半球间的海面温差和大陆降水在巴西东北部的变化之间的同步和近线性的联系。AMOC强度，海面温差和降水变化之间的紧密耦合在巴西东北部明确指出，快速和成比例的调整ITCZ的位置在大西洋纬向热输送过去的变化。
Changes in heat transport associated with fluctuations in the strength of the Atlantic meridional overturning circulation (AMOC) are widely considered to affect the position of the Intertropical Convergence Zone (ITCZ), but the temporal immediacy of this teleconnection has to date not been resolved. Based on a high-resolution marine sediment sequence over the last deglaciation, we provide evidence for a synchronous and near-linear link between changes in the Atlantic interhemispheric sea surface temperature difference and continental precipitation over northeast Brazil. The tight coupling between AMOC strength, sea surface temperature difference, and precipitation changes over northeast Brazil unambiguously points to a rapid and proportional adjustment of the ITCZ location to past changes in the Atlantic meridional heat transport.