气候变化领域集成服务门户(CCPortal): An investigation of CMIP5 model biases in simulating the impacts of central Pacific El Niño on the East Asian summer monsoon

CCPortal

DOI	10.1007/s00382-018-4284-2
	An investigation of CMIP5 model biases in simulating the impacts of central Pacific El Niño on the East Asian summer monsoon
	Feng J.; Chen W.; Gong H.; Ying J.; Jiang W.
发表日期	2019
ISSN	0930-7575
起始页码	2631
结束页码	2646
卷号	52 期号:2020-05-06
英文摘要	The delayed impacts of the central Pacific (CP) El Niño on the East Asian summer monsoon (EASM) are evaluated by comparing historical runs from Coupled Model Intercomparison Project Phase 5 models against reanalysis data. In observations, an anomalous western North Pacific anticyclone (WNPAC), linking CP El Niño to the EASM, forms due to the transition of sea surface temperature (SST) warming into SST cooling over the CP, which generates a WNPAC through a Gill–Matsuno response. In comparison with the observational result, only one-third of the models (i.e., the type-I models) capture a weaker and smaller WNPAC, whereas the other two-thirds (i.e., the type-II models) fail to reproduce a WNPAC. The simulation biases in both of type-I models and type-II models mainly arise from an unrealistic, long-lasting CP El Niño warming, which causes a north Indian Ocean SST warming bias in models through air–sea interaction process. This north Indian Ocean SST warming generates the WNPAC through capacitor effects, which is different from the WNPAC formation mechanism in observations. This discrepancy leads to simulation biases in type-I models. In type-II models, the unrealistic CP El Niño warming persists into summer, which produces an anomalous cyclone over the central-western Pacific. The opposite effect of the CP and north Indian Ocean SST warming on the WNP atmospheric circulation leads to disappearance of the WNPAC. Hence, large simulation biases are produced in type-II models. Further analysis demonstrates the slow decay of CP El Niño is caused by the unrealistically simulated climatological SST, which creates strong warm meridional oceanic advection and results in a sustained CP El Niño warming. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Central Pacific El Niño; CMIP5 models; East Asian summer monsoon; Simulation bias; Western North Pacific anticyclone
语种	英语
scopus关键词	advection; air-sea interaction; anticyclone; atmospheric circulation; climate modeling; cooling; El Nino; monsoon; sea surface temperature; warming; Indian Ocean; Indian Ocean (North); Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (North)
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/146500
作者单位	Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 2718, Beijing, 100029, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Feng J.,Chen W.,Gong H.,et al. An investigation of CMIP5 model biases in simulating the impacts of central Pacific El Niño on the East Asian summer monsoon[J],2019,52(2020-05-06).
APA	Feng J.,Chen W.,Gong H.,Ying J.,&Jiang W..(2019).An investigation of CMIP5 model biases in simulating the impacts of central Pacific El Niño on the East Asian summer monsoon.Climate Dynamics,52(2020-05-06).
MLA	Feng J.,et al."An investigation of CMIP5 model biases in simulating the impacts of central Pacific El Niño on the East Asian summer monsoon".Climate Dynamics 52.2020-05-06(2019).