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The cooperative impacts of the El Nino-Southern Oscillation and the Indian Ocean Dipole on the interannual variability of autumn rainfall in China
Xu, Kang; Zhu, Congwen; Wang, Weiqiang; Wang, WQ (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationINTERNATIONAL JOURNAL OF CLIMATOLOGY
Volume36Issue:4Pages:1987-1999
AbstractThe El Nino-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) are high degree synergic air-sea interactions greatly affecting the interannual variability of rainfall in China. This study reveals the possible cooperative impacts of the ENSO and IOD on boreal autumn rainfall anomalies in China, on the basis of data analysis collected during 1951-2010. Our results suggest that the positive phase of the combined ENSO and IOD events may result in an anomalous lower-level anticyclone over the western North Pacific (WNP) region, with a southward shift of the strengthened East Asian jet stream (EAJS). An enhanced moisture supply is transported to increase autumn rainfall over southern China by the southwesterly winds. In the negative phase, however, southerly anomalies are observed between the anomalous cyclone and anticyclone over the Indo-China Peninsula and the WNP, which carry more moisture to the Loess Plateau (LP) area with a northward shift of the weakened EAJS, leading to an increase of autumn rainfall in this area. Note that the negative IOD plays an important role in the cooperative influences on the autumn rainfall anomalies over the LP in that the associated anomalous lower-level cyclone shifts westward compared to the impacts of the pure La Nina. The regional asymmetric responses of autumn rainfall to the positive and negative phases of the ENSO and IOD could be attributed to the different responses of lower-level circulation over WNP and the meridional shift of the upper-level EAJS. Results demonstrate that the combined ENSO and IOD induce an anomalous zonal gradient of sea surface temperature (SST) over the tropical Indo-Pacific Ocean to alter the convection anomalies over the Indo-Pacific warm pool that further affect the upper and lower atmospheric circulations by means of a Rossby wave response.
Department[Xu, Kang; Wang, Weiqiang] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China; [Xu, Kang] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing, Peoples R China; [Zhu, Congwen] Chinese Acad Meteorol Sci, Inst Climate Syst, Beijing, Peoples R China ; LTO
KeywordEnso Iod Cooperative Impacts Autumn RaInfall In chIna Western North Pacific Anticyclone East Asian Jet Stream
Subject AreaMeteorology & Atmospheric Sciences
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15553
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorWang, WQ (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Xu, Kang,Zhu, Congwen,Wang, Weiqiang,et al. The cooperative impacts of the El Nino-Southern Oscillation and the Indian Ocean Dipole on the interannual variability of autumn rainfall in China[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2016,36(4):1987-1999.
APA Xu, Kang,Zhu, Congwen,Wang, Weiqiang,&Wang, WQ .(2016).The cooperative impacts of the El Nino-Southern Oscillation and the Indian Ocean Dipole on the interannual variability of autumn rainfall in China.INTERNATIONAL JOURNAL OF CLIMATOLOGY,36(4),1987-1999.
MLA Xu, Kang,et al."The cooperative impacts of the El Nino-Southern Oscillation and the Indian Ocean Dipole on the interannual variability of autumn rainfall in China".INTERNATIONAL JOURNAL OF CLIMATOLOGY 36.4(2016):1987-1999.
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