Decadal Variations in the Meridional Thermal Contrast in East Asia and Its Adjacent Regions: Relative Roles of External Forcing and Internal Variability

Author:

Zhang Kaiwen12,Zuo Zhiyan134ORCID,Xiao Dong5

Affiliation:

1. a Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, China

2. b State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China

3. c National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Shanghai, China

4. d Shanghai Frontiers Science Center of Atmosphere–Ocean Interaction, Shanghai, China

5. e Key Laboratory of Cities’ Mitigation and Adaptation to Climate Change in Shanghai, China Meteorological Administration, Shanghai, China

Abstract

Abstract Against the backdrop of global warming, the Eurasian continent and its surrounding areas have experienced ununiform warming in recent decades. Variations in the meridional thermal contrast (MTC) in East Asia and its adjacent regions have a critical influence on the East Asian summer monsoon (EASM); therefore, its forcings were analyzed in this study. The results show that the MTC in East Asia and the surrounding regions showed significant decadal changes during the interval 1960–2014, with a decadal strengthening in the late 1970s and a decadal weakening in the late 1990s. Further investigation showed that internal variability was the dominant control on these two decadal changes of MTC, accounting for 135% and 78.5% of the two observed changes in the 1970s and 1990s, respectively. Based on pacemaker experiments and a method that reconstructs decadal changes in the interdecadal Pacific oscillation (IPO), we found that a positive phase of the IPO tends to cause cooling in the low latitudes and warming in the mid–high latitudes and that a negative phase of the IPO tends to cause warming in the low latitudes and cooling in the mid–high latitudes, which in turn can explain 54.4% and 35.8% of the two internally generated decadal changes in the MTC, respectively. The Atlantic multidecadal oscillation (AMO), when in the same phase as the IPO, exhibits an opposing pattern of surface air temperature. This only had a significant influence in the late 1990s, where it explained 37.9% of the internally generated decadal changes in the MTC. Our findings highlight that internal variability, especially that relating to the IPO and the AMO, should be considered when predicting future changes in thermal conditions in East Asia and its adjacent regions.

Funder

the National Key Research and Development Program

the National Natural Science Foundation of China

Publisher

American Meteorological Society

Subject

Atmospheric Science

Reference91 articles.

1. Using an AGCM to diagnose historical effective radiative forcing and mechanisms of recent decadal climate change;Andrews, T.,2014

2. The ratio of land to ocean temperature change under global warming;Boer, G. J.,2011

3. Impacts of anomalous midlatitude cyclone activity over East Asia during summer on the decadal mode of East Asian summer monsoon and its possible mechanism;Chen, H.,2017

4. Role of local atmospheric forcing and land–atmosphere interaction in recent land surface warming in the midlatitudes over East Asia;Chen, H.,2020

5. Numerical experiment of impact of sea surface temperature in South China Sea and warm pool/west Pacific on East Asian summer monsoon;Chen, L.,1998

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