Abstract Slowdowns of the Atlantic meridional overturning circulation during Heinrich stadials (HS) caused reductions in cross-equatorial heat transport, southward shifts of the Intertropical Convergence Zone and intensification of precipitation over eastern tropical South America. While these changes are well described, the associated spatial sea surface temperature (SST) patterns are still unclear. Here, we analyze proxy data to assess changes in ocean-atmosphere interactions during HS over the western South Atlantic. Our SST proxy records show contrasting patterns between the tropical (warming) and the subtropical (no change) western South Atlantic during HS. We propose that the distinct SST behavior in the subtropics was associated with the cloud cover effect of the South Atlantic Convergence Zone over the upper ocean.

中文翻译：

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Heinrich stadials 期间南大西洋西部的海洋-大气相互作用

摘要 Heinrich stadials (HS) 期间大西洋经向翻转环流的减慢导致跨赤道热传输减少、热带辐合带向南移动以及南美洲东部热带地区降水增强。虽然这些变化得到了很好的描述，但相关的空间海面温度 (SST) 模式仍不清楚。在这里，我们分析代理数据以评估南大西洋西部 HS 期间海洋-大气相互作用的变化。我们的 SST 代理记录显示了 HS 期间热带（变暖）和亚热带（无变化）西南大西洋之间的对比模式。我们提出，亚热带地区独特的海温变化与南大西洋辐合带上层海洋的云量效应有关。