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《Transactions of Atmospheric Sciences》 2018-05
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Evolution features of El Nio events simulated by 23 CMIP5 models

JIANG Youshan;ZHANG Gaojie;CHEN Mingcheng;GE Xuyang;Nanjing Meteorological Bureau;Meteorological Center of Northwest Regional Air Traffic Management Bureau;Nanjing University of Information Science and Technology;  
Based on the output data from 23 CMIP5 models,the evolution features of El Nio events were studied.The results showed that one third of the CMIP5 models can well demonstrate the evolution process of El Nio events while another one third of the models can not.Both dynamic and thermodynamic processes contributed to the fast decaying process of El Nio events.The former was related to wind responses in western Pacific whereas the latter was associated with cloud-radiation-SST feedback.The good models had the feature that a sea surface temperature anomaly center was located in the equatorial eastern Pacific region,while it tended to shift westward in the pool models.As a result,a strong negative SSTA tendency occurred during El Nio decaying phase in the good models and a much weaker SSTA tendency occurred in the pool models.Such a difference led to a SSTA sign change 1n next summer of El Nio events in the good models but there was no such sign change in pool models.A seasondependent coupled instability caused by sea-air interaction joined in autumn in northern hemisphere.Therefore,in good models,the negative SSTA developed and changed into a La Nia event and in pool models it maintained an El Nio episode.Results also showed that one third of the CMIP5 models could not well simulate the phase locking feature of El Nio events.
【Fund】: 华东区域气象科技协同创新基金合作项目(QYHZ201604)
【CateGory Index】: P732
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