Evaluation of the Mechanisms Acting on the Atlantic Meridional Overturning Circulation in CESM2 for the 1pctCO_(2) Experiment  

作　　者：Lívia Sancho Elisa Passos Marcio Cataldi Luiz Paulo de Freitas Assad Luiz Landau 

机构地区：[1]Laboratory of Computational Methods in Engineering,Civil Engineering Program,Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering,Federal University of Rio de Janeiro,Rio de Janeiro,21941-617,Brazil [2]Civil Engineering Program,Alberto Luiz Coimbra Institute for Graduate Studies and Engineering Research,Federal University of Rio de Janeiro,Rio de Janeiro,21941-617,Brazil [3]Physical Oceanography Laboratory,Department of Physical Oceanography,Faculty of Oceanography,Rio de Janeiro State University,Rio de Janeiro,20559-900,Brazil [4]Climate System Monitoring and Modeling Laboratory,Water Resources and Environmental Engineering,Fluminense Federal University,24020-140,Brazil [5]Regional Atmospheric Modeling Group(MAR),Physics of the Earth,Department of Physics,Regional Campus of International Excellence(CEIR)“Campus Mare Nostrum”,University of Murcia,Murcia,30100,Spain [6]Department of Meteorology,Institute of Geosciences,Federal University of Rio de Janeiro,Rio de Janeiro,21941-617,Brazil

出　　处：《Journal of Atmospheric Science Research》2024年第1期40-58,共19页大气科学研究（英文）

基　　金：This work was possible through the financing of PEC-20480 Project between Royal Dutch Shell(Shell)and the Laboratório de Métodos Computacionais em Engenharia(LAMCE)and through the doctoral fellowship funding by CNPq for Elisa Passos Case number 141819/2016-2;the postdoctoral fellowship funding by FAPERJ E 10/2020-Edital Inteligência Artificial Case Number E-26/203.327/2022-Enrollment No.Scholarship 2015.08297.7 for Lívia Sancho.

摘　　要：The Atlantic Meridional Overturning Circulation(AMOC)is a crucial component of the Earth’s climate system due to its fundamental role in heat distribution,carbon and oxygen transport,and the weather.Other climate components,such as the atmosphere and sea ice,influence the AMOC.Evaluating the physical mechanisms of those interactions is paramount to increasing knowledge about AMOC’s functioning.In this study,the authors used outputs from the Community Earth System Model version 2 and observational data to investigate changes in theAMOC and the associated physical processes.Two DECK experiments were evaluated:piControl and 1pctCO_(2),with an annual increase of 1%of atmospheric CO_(2).The analysis revealed a significant decrease in the AMOC,associated with changes in mixed layer depth and buoyancy in high latitudes of the North Atlantic,resulting in the shutdown of deep convection and potentially affecting the formation of North Atlantic Deep Water and Antarctic Bottom Water.A vital aspect observed in this study is the association between increased runoff and reduced water evaporation,giving rise to a positive feedback process.Consequently,the rates of freshwater spreading have intensified during this period,which could lead to an accelerated disruption of the AMOC beyond the projections of existing models.

关 键 词：AMOC Meridional cell Climate change Deep circulation CESM2 results CMIP6 

分 类 号：P73[天文地球—海洋科学]