SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Interhemispheric influence of Indo-Pacific convection oscillation on Southern Hemisphere rainfall through southward propagation of Rossby waves
Zhao, Sen; Li, Jianping2,3,4; Li, Yanjie5; Jin, Fei-Fei; Zheng, Jiayu6
2019
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Volume52Issue:2019-05-06Pages:3203
AbstractTropical Indo-western Pacific convection anomalies influence atmospheric circulation, impacting climate far beyond the tropics. Here we present observational and modelling evidence for an interhemispheric effect of the boreal summer (June-August) Indo-Pacific convection oscillation (IPCO), which is characterized by a zonal seesaw pattern between the north Indian Ocean (NIO) and the western North Pacific (WNP). It is found that the IPCO is significantly correlated with simultaneous rainfall over many parts of the Southern Hemisphere (SH), including western Australia and western Brazil. These interhemispheric connections in rainfall remain significant when then El Nino-Southern Oscillation, the Indian Ocean Dipole, and the SH Annular Mode related signals are excluded simultaneously, which may help to improve the SH seasonal predictions. The physical mechanism that underlies this interhemispheric connection is investigated using observations, Rossby wave diagnostics and a series of atmospheric model experiments. Results suggest that convective heating anomalies associated with the IPCO excite two distinct southward-propagating equivalent barotropic wave trains that propagate into the extratropics in the SH: the South Africa-mid-latitudes wave train excited by the heat sink over the NIO, and the Maritime Continent-subtropical Australia wave train excited by the heat source over the WNP. We further demonstrate that upper tropospheric northerlies over tropical Africa and the Indian Ocean are responsible for the southward propagation of stationary Rossby waves across the easterlies. These equivalent barotropic waves then modulate the moisture transport, baroclinicity, and mid-latitude storminess, and thus affect rainfall anomalies in the SH. The new wave train patterns provide novel insight into the teleconnection pathways of convective heating over the tropical Indian Ocean and western Pacific.
DepartmentLTO
KeywordInterhemispheric teleconnection Indo-Pacific convection oscillation Rossby waves Boreal summer Cross-equatorial propagation Rainfall
DOI10.1007/s00382-018-4324-y
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17756
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Nanjing Univ Informat Sci & Technol, Coll Atmospher Sci, Minist Educ, CIC,FEMD,ILCEC,Key Lab Meteorol Disaster, Nanjing 210044, Jiangsu, Peoples R China
2.Univ Hawaii Manoa, Dept Atmospher Sci, Honolulu, HI 96822 USA
3.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
4.Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China
5.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266237, Shandong, Peoples R China
6.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
7.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Sen,Li, Jianping,Li, Yanjie,et al. Interhemispheric influence of Indo-Pacific convection oscillation on Southern Hemisphere rainfall through southward propagation of Rossby waves[J]. CLIMATE DYNAMICS,2019,52(2019-05-06):3203, 3221.
APA Zhao, Sen,Li, Jianping,Li, Yanjie,Jin, Fei-Fei,&Zheng, Jiayu.(2019).Interhemispheric influence of Indo-Pacific convection oscillation on Southern Hemisphere rainfall through southward propagation of Rossby waves.CLIMATE DYNAMICS,52(2019-05-06),3203.
MLA Zhao, Sen,et al."Interhemispheric influence of Indo-Pacific convection oscillation on Southern Hemisphere rainfall through southward propagation of Rossby waves".CLIMATE DYNAMICS 52.2019-05-06(2019):3203.
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