近日，同济大学卢婉仪团队揭示了冰消期和全新世早期，由于翻转环流减弱，大西洋浅水区温度升高。2025年7月31日出版的《自然—地球科学》杂志发表了这项成果。
研究组基于底栖有孔虫镁锂比值，提出了8种大西洋次表层温度重建方法，并将重建变化的时间和幅度与两种耦合气候模型模拟的结果进行了比较。研究表明，与末次冰期和过去8000年相比，在末次冰消期的大部分时间和全新世早期，热带北大西洋浅水区（水深约500-1100米）异常温暖，模型认为这是由于AMOC相对较弱，减少了平流作用，导致热量积聚。
该温度重建结果表明，AMOC在约14700年前和全新世早期（约12000年至8000年前）有所增强，这表明增强的北向热量输送在这些时期促成了北半球的变暖和冰消期融化。瞬态模型模拟对温度重建特征的预测结果参差不齐，这可能是因为冰消期和全新世AMOC强度的约束较差，且模型不准确。
附：英文原文
Title: Warmer shallow Atlantic during deglaciation and early Holocene due to weaker overturning circulation
Author: Lu, Wanyi, Oppo, Delia W., Liu, Zhengyu, Zhu, Chenyu, Condron, Alan, Lynch-Stieglitz, Jean, Guo, Weifu, Hess, Anya V., Wang, Shouyi
Issue&Volume: 2025-07-31
Abstract: Model simulations project that the Atlantic Meridional Overturning Circulation (AMOC) will weaken in response to global warming, but with large uncertainty. The past 20kyr are a prime target for model validation, as boundary conditions are reasonably well known, and the AMOC and climate experienced dramatic changes during this period. Here we present eight subsurface Atlantic temperature reconstructions based on benthic foraminiferal magnesium-to-lithium ratios, and compare the timing and amplitude of reconstructed changes with those in two coupled climate model simulations. We show that compared with the last glaciation and the past 8kyr, the shallow (~500–1,100m water depth) tropical North Atlantic was anomalously warm during most of the last deglaciation and early Holocene, which the models suggest is due to a relatively weak AMOC that reduced advection and allowed heat to accumulate. Our temperature reconstructions imply that the AMOC strengthened ~14.7kyr ago and during the early Holocene (from ~12 to 8 kyr ago), suggesting that enhanced northward heat transport contributed to Northern Hemisphere warming and deglacial melting at these times. The transient model simulations predict features of temperature reconstruction with varying success, possibly because deglacial and Holocene AMOC strength are poorly constrained, and not accurately simulated.
DOI: 10.1038/s41561-025-01751-y
Source: https://www.nature.com/articles/s41561-025-01751-y