Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation

Paleoceanography Pub Date : 2017-06-01 DOI:10.1002/2017PA003084

S. Mulitza, C. Chiessi, E. Schefuß, J. Lippold, David Wichmann, Benny Antz, A. Mackensen, A. Paul, M. Prange, K. Rehfeld, M. Werner, T. Bickert, N. Frank, H. Kuhnert, J. Lynch‐Stieglitz, R. Portilho-Ramos, A. Sawakuchi, M. Schulz, T. Schwenk, R. Tiedemann, M. Vahlenkamp, Yancheng Zhang

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引用次数: 87

Abstract

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.

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大西洋经向翻转和巴西东北部降水的同步和比例消融变化

与大西洋经向翻转环流(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，但这种远相关的时间直接性迄今尚未得到解决。基于末次消冰期的高分辨率海洋沉积物序列，我们提供了大西洋半球海表温差变化与巴西东北部大陆降水之间的同步和近线性联系的证据。AMOC强度、海面温差和巴西东北部降水变化之间的紧密耦合，明确指出ITCZ位置对过去大西洋经向热输送变化的快速和比例调整。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Paleoceanography 地学-地球科学综合

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审稿时长

6-12 weeks