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| The Relationship between the East Asian Subtropical Westerly Jet and Summer Precipitation over East Asia as Simulated by the IAP AGCM4.0 |
| YAN Zheng-Bin1,2, LIN Zhao-Hui1,3, ZHANG He1 |
1The International Center for Climate and Environment Sciences (ICCES), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China
2University of Chinese Academy of Sciences, Beijing 100049, China
3Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, 210044, China |
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Abstract Based on a30-year Atmospheric Model Intercomparison Project (AMIP) simulation usingIAP AGCM4.0, the relationship between the East Asian subtropical westerly jet (EASWJ) and summer precipitation over East Asia has been investigated, and compared with observation. It was found the meridional displacement of the EASWJ has a closer relationship with the precipitation over East Asia both from model simulation and observation, with an anomalous southward shift of the East Asian subtropical westerly jet (EASWJ)being conducive to rainfall over the Yangtze-Huaihe river valley (YHRV), and an anomalous northward shift resulting in less rainfall over the YHRV. However, the simulated precipitation anomalies were found to be weaker than observed from the composite analysis, and this would be related to the weakly reproduced mid-upper-level convergence in the mid-high latitudes and ascending motion in the lower latitudes.
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Received: 12 May 2014
Revised: 17 May 2014
Accepted: 19 May 2014
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Corresponding Author:
Lin Zhao-Hui
E-mail: lzh@mail.iap.ac.cn
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