Influence of two types of El Niños on the East Asian climate during boreal summer: a numerical study
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The sea surface temperature anomaly pattern differs between the central Pacific (CP) and eastern Pacific (EP) El Niños during boreal summer. It is expected that the respective atmospheric response will be different. In order to identify differences in the responses to these two phenomena, we examine the Community Atmosphere Model Version 4 simulations forced with observed monthly sea surface temperature during 1979–2010 and compare with the corresponding observations. For CP El Niño, a triple precipitation anomaly pattern appears over East Asia. During EP El Niño, the triple pattern is not as significant as and shifts eastward and southward compared to CP El Niño. We also examine the influence of CP La Niña and EP La Niña on East Asia. In general, the impact of CP (EP) La Niña on tropics and East Asia seems to be opposite to that of CP (EP) El Niño. However, the impacts between the two types of La Niña are less independent compared to the two types of warm events. Both types of El Niño (La Niña) correspond to a stronger (weaker) western North Pacific summer monsoon. The sensitivity experiments support this result. But the CP El Niño (La Niña) may have more significant influence on East Asia summer climate than EP El Niño (La Niña), as the associated low-level anomalous wind pattern is more distinct and closer to the Asian continent compared to EP El Niño (La Niña).
KeywordsCP El Niño CP La Niña CAM4 AMIP
This research is jointly supported by the National Natural Science Foundation of China (Grant No. 41175076) and the National Key Basic Research Program of China (Grant No. 2009CB421404). RW acknowledges the support of a Hong Kong Research Grants Council grant (CUHK403612) and the National Natural Science Foundation of China (41275081). ZC acknowledges the support of the high-performance grid computing platform of Sun Yat-sen University.
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