The ENSO-induced PacificeSouth America(PSA)pattern is an important atmospheric bridge in linking the Antarctic climate to the tropical Pacific.The AGCM simulated PSA-like responses to ENSO are evidently weaker than th...The ENSO-induced PacificeSouth America(PSA)pattern is an important atmospheric bridge in linking the Antarctic climate to the tropical Pacific.The AGCM simulated PSA-like responses to ENSO are evidently weaker than the observed in terms of its intensity due to the lack of airesea coupling processes.The Tasman Sea features active airesea interactions.However,how and to what extent the airesea coupling explains the deficiency of the AGCM responses to ENSO is unclear.In this study,the role of the airesea coupling elsewhere the tropical Pacific in shaping the ENSOeSouth Pacific teleconnection is first estimated by comparing the coupled tropical Pacific pacemaker experiments(PACE)derived from the Community Earth System Model version 1(CESM1)and the parallel Pacific OceaneGlobal Atmosphere experiments(POGA)with the same atmospheric component model of CESM1.Our results suggest that the airesea coupling elsewhere the tropical Pacific greatly intensifies the South Pacific atmospheric response to ENSO.Then the separated impact of airesea coupling over the Tasman Sea is stressed with another set of AGCM experiments forced with the PACE sea surface temperature(SST)outputs in the Tasman Sea.The results show that the atmospheric response to the SST anomalies in the Tasman Sea bears a remarkable resemblance to that due to the airesea coupling elsewhere the tropical Pacific,and explains about 30%of the intensified amplitude.This highlights a substantial contribution of the airesea coupling over the Tasman Sea to intensifying the extratropical South Pacific atmospheric responses to ENSO,and provides a new perspective on the connection between tropical Pacific and Antarctic climate change.展开更多
基金This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA19070402)the National Natural Science Foundation of China(41790473)the National Key Research and Development Program of China(2019YFC1510105).
文摘The ENSO-induced PacificeSouth America(PSA)pattern is an important atmospheric bridge in linking the Antarctic climate to the tropical Pacific.The AGCM simulated PSA-like responses to ENSO are evidently weaker than the observed in terms of its intensity due to the lack of airesea coupling processes.The Tasman Sea features active airesea interactions.However,how and to what extent the airesea coupling explains the deficiency of the AGCM responses to ENSO is unclear.In this study,the role of the airesea coupling elsewhere the tropical Pacific in shaping the ENSOeSouth Pacific teleconnection is first estimated by comparing the coupled tropical Pacific pacemaker experiments(PACE)derived from the Community Earth System Model version 1(CESM1)and the parallel Pacific OceaneGlobal Atmosphere experiments(POGA)with the same atmospheric component model of CESM1.Our results suggest that the airesea coupling elsewhere the tropical Pacific greatly intensifies the South Pacific atmospheric response to ENSO.Then the separated impact of airesea coupling over the Tasman Sea is stressed with another set of AGCM experiments forced with the PACE sea surface temperature(SST)outputs in the Tasman Sea.The results show that the atmospheric response to the SST anomalies in the Tasman Sea bears a remarkable resemblance to that due to the airesea coupling elsewhere the tropical Pacific,and explains about 30%of the intensified amplitude.This highlights a substantial contribution of the airesea coupling over the Tasman Sea to intensifying the extratropical South Pacific atmospheric responses to ENSO,and provides a new perspective on the connection between tropical Pacific and Antarctic climate change.
