气候变化领域集成服务门户(CCPortal): Effect of excessive equatorial Pacific cold tongue bias on the El Niño-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble

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DOI	10.1007/s00382-018-4504-9
	Effect of excessive equatorial Pacific cold tongue bias on the El Niño-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble
	Li G.; Jian Y.; Yang S.; Du Y.; Wang Z.; Li Z.; Zhuang W.; Jiang W.; Huang G.
发表日期	2019
ISSN	0930-7575
起始页码	6195
结束页码	6212
卷号	52 期号:2020-09-10
英文摘要	El Niño induces an anomalous lower-tropospheric anticyclone over the tropical Northwest Pacific (NWP), accompanied by suppressed local convection and rainfall. The tropical NWP anomalies persist until the following summer, with major effects on the Asian summer monsoons. Based on the phase 5 of the Coupled Model Intercomparison Project (CMIP5) multi-model ensemble, this study finds that climate models commonly underestimate this El Niño-NWP teleconnection with too weak tropical NWP anticyclone and rainfall anomalies in post-El Niño summers, potentially limiting the models’ skill in seasonal prediction of the Asian summer monsoons. The analyses show that such underestimated NWP anomalies in post-El Niño summers in CMIP5 models can be traced back to the well-known excessive equatorial Pacific cold tongue error in the mean. Models with an excessive westward extension of Pacific cold tongue tend to displace westward the simulated pattern of El Niño-related warm SST anomalies along the equator. The warm SST biases over the western Pacific in CMIP5 models would enhance the local atmospheric convection/rainfall and induce low-level cyclonic circulation anomalies over the tropical NWP with a Gill-type Rossby wave response, resulting in the commonly underestimated NWP anticyclone and rainfall anomalies during post-El Niño summers. The present results, along with our previous finding that the equatorial cold tongue bias would distort the projections of tropical Pacific warming pattern under increased greenhouse gas scenario, imply that reducing equatorial cold tongue bias in models can substantially improve climate simulation and prediction/projection for the tropical Pacific and Asian monsoons. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Asian summer monsoons; El Niño; Equatorial Pacific cold tongue; Matsuno-Gill dynamics; Model error; Tropical Northwest Pacific anticyclone
语种	英语
scopus关键词	anticyclone; atmospheric dynamics; climate modeling; computer simulation; El Nino; ensemble forecasting; error analysis; monsoon; summer; troposphere; Pacific Ocean; Pacific Ocean (Equatorial); Pacific Ocean (Northwest); Pacific Ocean (Tropical)
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/146304
作者单位	College of Oceanography, Hohai University, Nanjing, China; Institute of Earth Climate and Environment System, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Li G.,Jian Y.,Yang S.,et al. Effect of excessive equatorial Pacific cold tongue bias on the El Niño-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble[J],2019,52(2020-09-10).
APA	Li G..,Jian Y..,Yang S..,Du Y..,Wang Z..,...&Huang G..(2019).Effect of excessive equatorial Pacific cold tongue bias on the El Niño-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble.Climate Dynamics,52(2020-09-10).
MLA	Li G.,et al."Effect of excessive equatorial Pacific cold tongue bias on the El Niño-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble".Climate Dynamics 52.2020-09-10(2019).