The Impact of the Tropical Indian Ocean on South Asian High in Boreal Summer  被引量:27

The Impact of the Tropical Indian Ocean on South Asian High in Boreal Summer

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作  者:黄刚 屈侠 胡开明 

机构地区:[1]Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences [2]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences

出  处:《Advances in Atmospheric Sciences》2011年第2期421-432,共12页大气科学进展(英文版)

基  金:supported by the National Key Technology R&D Program 2008BAK50B02;CAS Innovation Key Program (Grant No. KZCX2-YW-BR-14);National Basic Research Program of China(2011CB309704);Special Scientific Research Project for Public Interest (Grant No. GYHY201006021);the National Natural Science Foundation of China (Grant Nos.40890155, 40775051, U0733002)

摘  要:The tropical Indian Ocean (TIO) is warmer than normal during the summer when or after the El Nio decays. The present study investigates the impact of TIO SST on the South Asian High (SAH) in summer. When the TIO is warmer, the SAH strengthens and its center shifts southward. It is found that the variations in the SAH cannot be accounted for by the precipitation anomaly. A possible mechanism is proposed to explain the connection between the TIO and SAH: warmer SST in the TIO changes the equivalent potential temperature (EPT) in the atmospheric boundary layer (ABL), alters the temperature profile of the moist atmosphere, warms the troposphere, which produces significant positive height anomaly over South Asia and modifies the SAH. An atmospheric general circulation model, ECHAM5, which has a reasonable prediction skill in the TIO and South Asia, was selected to test the effects of TIO SST on the SAH. The experiment with idealized heating over the TIO reproduced the response of the SAH to TIO warming. The results suggest that the TIO-induced EPT change in the ABL can account for the variations in the SAH.The tropical Indian Ocean (TIO) is warmer than normal during the summer when or after the El Nio decays. The present study investigates the impact of TIO SST on the South Asian High (SAH) in summer. When the TIO is warmer, the SAH strengthens and its center shifts southward. It is found that the variations in the SAH cannot be accounted for by the precipitation anomaly. A possible mechanism is proposed to explain the connection between the TIO and SAH: warmer SST in the TIO changes the equivalent potential temperature (EPT) in the atmospheric boundary layer (ABL), alters the temperature profile of the moist atmosphere, warms the troposphere, which produces significant positive height anomaly over South Asia and modifies the SAH. An atmospheric general circulation model, ECHAM5, which has a reasonable prediction skill in the TIO and South Asia, was selected to test the effects of TIO SST on the SAH. The experiment with idealized heating over the TIO reproduced the response of the SAH to TIO warming. The results suggest that the TIO-induced EPT change in the ABL can account for the variations in the SAH.

关 键 词:tropical Indian Ocean South Asia High equivalent potential temperature 

分 类 号:P732[天文地球—海洋科学] P434

 

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