美国俄亥俄州大学刘征宇和上海交通大学顾思凡团队合作报道了风引导的大西洋经向翻转环流的东部路径。2024年3月11日出版的《自然—地球科学》发表了这项成果。

通过结合水文观测和再分析，研究人员确定了一条位于大西洋中脊以东的中深东部通道，并通过不同分辨率的模型模拟(包括漩涡分辨率模拟)进一步证实了这一点。东部通道占了横跨环流边界的北大西洋深水运输量的一半。

敏感性实验表明，中深东部通道不是由底部地形而是由海盆尺度海洋环流动力学形成的，受星际通信窗口上的风向控制。研究结果为AMOC途径提供了一个模型，并呼吁进一步研究与不同AMOC途径相关的气候响应和变率。

据了解，北大西洋深水的扩散路径是大西洋经向翻转环流(AMOC)的下缘，其决定了气候变化信号是如何在全球海洋中传播的。北大西洋深水是由大西洋中脊以西的西边界流和涡旋驱动的内部通道，从亚极地大西洋向西部盆地亚热带输送的。然而，很少有人关注东部盆地的AMOC跨环流输运。

附：英文原文

Title: Wind-steered Eastern Pathway of the Atlantic Meridional Overturning Circulation

Author: Liu, Zhengyu, Gu, Sifan, Zou, Sijia, Zhang, Shaoqing, Yu, Yangyang, He, Chengfei

Issue&Volume: 2024-03-11

Abstract: The spreading pathway of the North Atlantic Deep Water, which is the lower limb of the Atlantic Meridional Overturning Circulation (AMOC), determines how climate change signals are transported throughout the global ocean. The North Atlantic Deep Water is suggested to be transported from the subpolar Atlantic to the subtropics in the western basin by the Deep Western Boundary Current and the eddy-driven interior pathway west of the Mid-Atlantic Ridge. However, much less attention has been paid to AMOC cross-gyre transport in the eastern basin. Here, combining hydrographic observations and reanalysis, we identify a robust mid-depth Eastern Pathway located east of the Mid-Atlantic Ridge, which is further corroborated by model simulations with various resolutions, including eddy-resolving simulations. The Eastern Pathway accounts for half of the North Atlantic Deep Water transport across the intergyre boundary. Sensitivity experiments suggest that the mid-depth Eastern Pathway is formed by basin-scale ocean circulation dynamics due to wind steering on the intergyre communicating window instead of bottom topography. Our results provide a model for the AMOC pathway and call for further investigations on the climate response and variabilities associated with different AMOC pathways.

DOI: 10.1038/s41561-024-01407-3

Source: https://www.nature.com/articles/s41561-024-01407-3