气候变化领域集成服务门户(CCPortal): El Niño–East Asian monsoon teleconnection and its diversity in CMIP5 models

CCPortal

DOI	10.1007/s00382-019-04938-3
	El Niño–East Asian monsoon teleconnection and its diversity in CMIP5 models
	Wang P.; Tam C.-Y.; Xu K.
发表日期	2019
ISSN	0930-7575
起始页码	6417
结束页码	6435
卷号	53 期号:2020-09-10
英文摘要	In this study, we assess the performance of state-of-the-art coupled models in reproducing El Niño diversity and its impacts on the East Asian Summer Monsoon (EASM), based on simulations taken from the Coupled Model Intercomparison Project phase 5 (CMIP5). All of the 17 models used in this study are identified to give reasonable eastern-Pacific (EP) El Niño-related sea surface temperature anomalies (SSTA) and anomalous Walker circulation compared with observations, whereas one-third of the models fail to reproduce the Walker circulation anomalies for central-Pacific (CP) El Niño. In these models, negative SSTA over the eastern-to-central Pacific are found to be too strong, while positive SSTA shift to the western Pacific during CP El Niño. There is thus sinking (rising) motion over the central (western) part of the Pacific basin, implying westward displaced anomalous Walker cells, relative to the observed. This results in simulated low-level cyclonic flow and positive rainfall anomalies over the far western north Pacific/South China Sea during and after the peak phase of CP El Niño, which are opposite to the observed anomalous climate state. The other two-thirds of models, with realistic CP El Niño-related anomalous Walker cell, can better reproduce the corresponding wind circulation and rainfall anomalies over East Asian (EA) region. The contrasting CP El Niño-related teleconnection among models mainly arises from the different simulated CP El Niño SSTA, which in turn determine the circulation anomalies through a Gill-type response. Further analyses reveal that, in the mean state of models with erroneous teleconnection, there exists a large cold SST bias over the eastern Pacific. The stronger Walker circulation, and possibly the stronger Bjerknes feedback, might be responsible for the overly negative SSTA associated with CP El Niño in the vicinity. Our results highlight the sensitivity of El Niño–EA climate linkage to the oceanic state in models, especially for CP El Niño events. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Central-Pacific El Niño; CMIP5; East Asian summer monsoon; Eastern-Pacific El Niño; El Niño–EASM teleconnection
语种	英语
scopus关键词	air-sea interaction; atmosphere-ocean coupling; climate modeling; computer simulation; El Nino; monsoon; performance assessment; summer; teleconnection; Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (East)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145862
作者单位	Earth System Science Programme, The Chinese University of Hong Kong, Hong Kong; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
推荐引用方式 GB/T 7714	Wang P.,Tam C.-Y.,Xu K.. El Niño–East Asian monsoon teleconnection and its diversity in CMIP5 models[J],2019,53(2020-09-10).
APA	Wang P.,Tam C.-Y.,&Xu K..(2019).El Niño–East Asian monsoon teleconnection and its diversity in CMIP5 models.Climate Dynamics,53(2020-09-10).
MLA	Wang P.,et al."El Niño–East Asian monsoon teleconnection and its diversity in CMIP5 models".Climate Dynamics 53.2020-09-10(2019).