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《大气科学进展(英文版)》 2010-03
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An Inter-hemispheric Teleconnection and a Possible Mechanism for Its Formation

LIU Ge1,JI Liren2,SUN Shuqing2,and ZHANG Qingyun2 1 Chinese Academy of Meteorological Sciences,Beijing 100081 2State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029  
Through observational analyses,an inter-hemispheric teleconnection is identified between the subtropical region of the South China Sea to the western Pacific near the Philippines(WP)and the region to the east of Australia(AE).The teleconnection is significantly correlated with sea surface temperature anomalies(SSTAs)in key sea areas(including the Indian Ocean,the South China Sea,and the area to the east of Australia).Based on the IAP T42L9 model,numerical experiments are performed to explore a possible mechanism for the formation of the teleconnection.The results show that the positive SST anomalies in the key sea areas may jointly contribute to the occurrence and maintenance of the positive geopotential height anomalies over both the WP and AE and be a critical factor in the teleconnection formation.The large-scale SST anomaly in the Indian Ocean,involving the tropics and subtropics of both hemispheres,may lead to concurrent atmospheric responses over both the WP and AE,while the effect of the local SST anomaly to the east of Australia seems to reinforce and maintain the positive height anomaly over the AE.
【Fund】: supported by National Basic Research Program of China(Grant No.2009CB421401);; National Key Technology R&D Program(Grant No.2009BAC51B00);; National Natural Science Foundation of China(Grant No.40975022)
【CateGory Index】: P731.11
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