The Atlantic Meridional Overturning Circulation (AMOC)—one of Earth’s major ocean circulation systems—redistributes heat on our planet and has a major impact on climate. Here, we compare a variety of published proxy records to reconstruct the evolution of the AMOC since about ad 400. A fairly consistent picture of the AMOC emerges: after a long and relatively stable period, there was an initial weakening starting in the nineteenth century, followed by a second, more rapid, decline in the mid-twentieth century, leading to the weakest state of the AMOC occurring in recent decades.

中文翻译：

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当前大西洋经向翻转环流是上个千年最弱的

大西洋经向翻转环流 (AMOC) - 地球上主要的海洋环流系统之一 - 重新分配地球上的热量并对气候产生重大影响。在这里，我们比较了各种已发表的代理记录，以重建自公元 400 年左右以来 AMOC 的演变。 出现了相当一致的 AMOC 图：经过一段较​​长且相对稳定的时期后，从 19 世纪开始出现初步减弱，随后在 20 世纪中叶出现第二次更迅速的下降，导致 AMOC 处于近几十年来最弱的状态。