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Effect of excessive equatorial Pacific cold tongue bias on the El Nino-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble
Li, Gen; Jian, Yuntao1; Yang, Song1,2; Du, Yan3; Wang, Ziqian1,2; Li, Zhenning1; Zhuang, Wei4,5; Jiang, Wenping6; Huang, Gang6
2019
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Volume52Issue:2019-09-10Pages:6195
AbstractEl Nino 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 Nino-NWP teleconnection with too weak tropical NWP anticyclone and rainfall anomalies in post-El Nino 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 Nino 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 Nino-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 Nino 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.
DepartmentLTO
KeywordEquatorial Pacific cold tongue Model error El Nino Tropical Northwest Pacific anticyclone Asian summer monsoons Matsuno-Gill dynamics
DOI10.1007/s00382-018-4504-9
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17732
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Hohai Univ, Coll Oceanog, Nanjing, Jiangsu, Peoples R China
2.Sun Yat Sen Univ, Sch Atmospher Sci, Inst Earth Climate & Environm Syst, Guangzhou, Guangdong, Peoples R China
3.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou, Guangdong, Peoples R China
4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
5.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
6.Xiamen Univ, Coll Ocean & Earth Sci, Xiamen, Peoples R China
7.Chinese Acad Sci, State Key Lab Numer Modeling Atmospher Sci & Geop, Inst Atmospher Phys, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Li, Gen,Jian, Yuntao,Yang, Song,et al. Effect of excessive equatorial Pacific cold tongue bias on the El Nino-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble[J]. CLIMATE DYNAMICS,2019,52(2019-09-10):6195, 6212.
APA Li, Gen.,Jian, Yuntao.,Yang, Song.,Du, Yan.,Wang, Ziqian.,...&Huang, Gang.(2019).Effect of excessive equatorial Pacific cold tongue bias on the El Nino-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble.CLIMATE DYNAMICS,52(2019-09-10),6195.
MLA Li, Gen,et al."Effect of excessive equatorial Pacific cold tongue bias on the El Nino-Northwest Pacific summer monsoon relationship in CMIP5 multi-model ensemble".CLIMATE DYNAMICS 52.2019-09-10(2019):6195.
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