Interannual variation in the East Asian summer monsoon-tropical Atlantic SST relationship modulated by the Interdecadal Pacific Oscillation

npj Climate and Atmospheric Science

Article

Hao Wang¹  Lei Fan¹  Jianping Li²  Ziguang Li²  Xiao-Tong Zheng²  Xiaopei Lin²  Yu Zhang² 

[1] Physical Oceanography Laboratory/Frontiers Science Center for Deep Ocean Multispheres and Earth System/Sanya Oceanographic Institution, Ocean University of China, Qingdao, China;Physical Oceanography Laboratory/Frontiers Science Center for Deep Ocean Multispheres and Earth System/Sanya Oceanographic Institution, Ocean University of China, Qingdao, China;Laoshan Laboratory, Qingdao, China;

关键词: ;   

DOI  :  10.1038/s41612-023-00497-x

 received in 2023-06-19, accepted in 2023-10-11,  发布年份 2023

来源: Springer

【 摘 要 】

Tropical Atlantic (TA) SST variability can impact the East Asian summer monsoon (EASM). Here, we find that the interannual EASM–TA relationship exhibits an evident interdecadal variation modulated by the Interdecadal Pacific Oscillation (IPO). The EASM–TA interannual relationship is strong during the positive phase of the IPO (pIPO) but weak during the negative phase of the IPO (nIPO). The pIPO (nIPO)-related warm (cold) SST anomalies in the central tropical Pacific (CTP) intensify (weaken) the convection over the CTP. Therefore, a Matsuno–Gill response of the TA-induced CTP SST change is strong (weak) during the pIPO (nIPO) period. The strong Matsuno–Gill response excites an anomalous anticyclone over the western North Pacific (WNPAC), leading to a significantly positive EASM–TA relationship. However, the WNPAC is absent in the nIPO periods due to the weak Mastono–Gill response, suggesting an insignificant EASM–TA relationship. Understanding the IPO-modulated EASM–TA relationship helps better forecast EASM variability.

【 授权许可】

CC BY   
© Springer Nature Limited 2023

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