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Numerical Simulation of the Atmospheric Low-FrequencyTeleresponse to External Forcing Part I:Anomalous SSTA in the Equatorial Eastern Pacific Ocean

Xiao Ziniu Li Chongyin(LASG , Institute of Atmospheric Physics, Chinese Academy of Sciences , Beijing . 100080)  
Based on the numerical simulation experiment completed in IAP-GCM , the atmospheric response to the warm SSTA in the equatorial eastern pacific has been studied . Furthermore , the evolution" of the atmospheric teleresponse are discussed .The results indicated that the atmospheric response to this anomalous heating source is mostly dominated by the low- frequency teleresponse with a period of 30 - 60 day . For different regions and seasons, the structure and activity of this 30 - 60 day oscillation caused by the external forcing are very similar to that of the real atmospheric 30 - 60 day oscillation. Therefore , we can suggest that the anomalous SST in the tropical ocean is one of the important mechanisms to cause 30 - 60 day oscillation in the global atmosphere .
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