Influence of solar forcing on multidecadal variability in the Atlantic meridional overturning circulation (AMOC)

Frontiers in Earth Science

Earth Science

Aihua Ye¹  Zhipeng Zhu¹  Ruyi Zhang¹  Limin Zhou²  Ziniu Xiao³ 

[1] Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai, China;Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai, China;Institute of Eco-Chongming, Shanghai, China;State Key Laboratory of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Beijing, China;

关键词: solar forcing;    AMOC;    multidecadal variability;    sensitivity test;    period;   

DOI  :  10.3389/feart.2023.1165386

 received in 2023-02-14, accepted in 2023-05-02,  发布年份 2023

来源: Frontiers

【 摘 要 】

There is a growing debate regarding the influence of solar activity on climate change as the solar forcing signal on decadal/multidecadal timescales is not robust in long-term reconstructed climate data or numerical simulations. However, solar forcing could be amplified by ocean–atmosphere coupling in sensitive regions, including the North Atlantic Ocean (N.A.). This study assessed the influence of varied total solar irradiance (TSI) due to the effects of solar activity on Atlantic Meridional Overturning Circulation (AMOC) based on an Earth System model with intermediate complexity (PLASIM-GENIE). Three groups of experiments with different TSI series; i.e., constant (NS), decadal varied (DS), and reconstructed whole (AS) for 1610–2000, were conducted and the AMOC response was investigated. The results showed that the internal forcing of the climate system led to quasi-35-year and quasi-65-year AMOC cycles and a significant and stable negative correlation between TSI and AMOC on a multidecadal timescale. The period was significantly extended due to solar forcing. The declining AMOC trend occurred in simulations after 1800. Thus, solar forcing contributed to a weakening AMOC at a rate of 0.41 Sv per century. The decadal variation in TSI was the main contributor to this decline due to solar forcing.

【 授权许可】

Unknown   
Copyright © 2023 Ye, Zhu, Zhang, Xiao and Zhou.