海洋地质与第四纪地质2024，Vol.44Issue(4)：32-40,9.DOI:10.16562/j.cnki.0256-1492.2024060701
中新世中低纬度海道变化对大西洋经圈翻转流和气候变化影响的模拟研究
Simulation of the mid-to-low latitudes seaways changes and the impact on the Atlantic Meridional Overturning Circulation and climate during the Miocene
摘要
Abstract
Since the Middle Miocene,the opening and closing of the Tethys and Panama seaways may have directly affected the intensity and spatial morphology of the Atlantic Meridional Overturning Current(AMOC).However,systematic studies on the connection between the two key mid-and low-latitude seaways and the AMOC are few.Based on the boundary conditions of the Middle Miocene,we conducted a Middle Miocene climate simulation experiment using a coupled climate model and a sensitivity experiment of the successive closure of the Tethys and Panama seaways.Results show that the openings of Tethys and Panama seaways provided"shortcuts"for tropical Indian and Pacific Ocean waters to enter the North Atlantic,respectively,and transported high-salinity and low-salinity seawater to the North Atlantic,respectively,which played opposite roles in the change of AMOC intensity.The opening of the Tethys Seaway enhanced the AMOC,which offset the weakening of the AMOC caused by the opening of the Panama Seaway.The closure of these two mid-and low-latitude seaways could cause a north-south asymmetric response of global sea surface temperature,and the dividing line was roughly located at the latitude of the Panama Seaway.This study showed that the modern spatial structure of AMOC could be formed only when the Tethys Seaway and the Panama Seaway were closed.Therefore,the closure time of these two mid-and low-latitude seaways is of great significance for studying the evolution of AMOC.关键词
大西洋经圈翻转流/中中新世大暖期/淡水输运/巴拿马海道/特提斯海道Key words
Atlantic Meridional Overturning Circulation(AMOC)/Middle Miocene Climatic Optimum(MMCO)/freshwater transport/Panama Seaway/Tethys Seaway分类
海洋科学引用本文复制引用
魏吉林,刘海龙,郑伟鹏,林鹏飞,赵彦..中新世中低纬度海道变化对大西洋经圈翻转流和气候变化影响的模拟研究[J].海洋地质与第四纪地质,2024,44(4):32-40,9.基金项目
国家重点研发计划项目课题"关键构造事件影响气候转型的数值模拟和机理分析"(2023YFF0803904) （2023YFF0803904）
