Monsoon circulation related to enso phase-locking |
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| Authors: | Xu Jianjun Zhu Qiangen Zhou Tiehan |
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| Institution: | LASG, institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,Nanjing Institute of Meteorology, Nanjing 210044,Nanjing Institute of Meteorology, Nanjing 210044 |
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| Abstract: | The relation of interannual anomaly of East Asian monsoon to the ENSO cycle is investigated in terms of even and odd symmetry analysis over a tropical heating field based on the past 30-year data. Evidence suggests that odd and even symmetry components related to the monsoon and Walker heating, respectively, effectively describe the East Asian monsoon circulation and Pacific Walker analog, with the monsoon intensity index corresponding to its heating vigor and western Pacific Walker heating vigor to ENSO phase change, both types of heating marked by pro-nounced seasonal variation and phase-locking; the key region for linking monsoon-ENSO interaction is the western Pacific warm pool; the monsoon effect upon ENSO cycle is affected jointly by the seasonal evolution and interannual anomaly of the heating components; the superimposition of an anti-Walker circulation phase produced by interannual winter monsoon perturbation upon a weaker Walker phase on a seasonal basis leads to an El Nino hap-pening in March-April and plays a significant role in maintaining a warm ENSO phase. |
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| Keywords: | Monsoon heating Walker heating ENSO cycle Phase locking |
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