IOCAS-IR  > 海洋环流与波动重点实验室
Impact of South Pacific Subtropical Dipole Mode on the Equatorial Pacific
Zheng, Jian1,2; Wang, Faming1,2,3; Alexander, Michael A.4; Wang, Mengyang1,3
2018-03-01
Source PublicationJOURNAL OF CLIMATE
ISSN0894-8755
Volume31Issue:6Pages:2197-2216
Corresponding AuthorZheng, Jian(zhengjian@qdio.ac.cn)
AbstractPrevious studies have indicated that a sea surface temperature anomaly (SSTA) dipole in the subtropical South Pacific (SPSD), which peaks in austral summer (January-March), is dominated by thermodynamic processes. Observational analyses and numerical experiments were used to investigate the influence of SPSD mode on the equatorial Pacific. The model is an atmospheric general circulation model coupled to a reduced-gravity ocean model. An SPSD-like SSTA was imposed on 1 March, after which the model was free to evolve until the end of the year. The coupled model response showed that warm SSTAs extend toward the equator with northwesterly wind anomalies and then grow to El Nino-like anomalies by the end of the year. SPSD forcing weakens southeasterly trade winds and propagates warm SSTAs toward the equator through wind-evaporation-SST (WES) feedback. Meanwhile, relaxation of trade winds in the eastern equatorial Pacific depresses the thermocline and upwelling. Eastward anomalous currents near the equator cause warm horizontal advection in the central Pacific. Further experiments showed that thermodynamic coupling mainly acts on but is not essential for SSTA propagation, either from the subtropics to the equator or westward along the equator, while oceanic dynamic coupling alone also appears to be able to initiate anomalies on the equator and plays a critical role in SSTA growth in the tropical Pacific. This is consistent with observational analyses, which indicated that influence of WES feedback on SSTA propagation associated with the SPSD is limited. Finally, the warm pole close to the equator plays the dominant role in inducing the El Nino-like anomalies.
DOI10.1175/JCLI-D-17-0256.1
Indexed BySCI
Language英语
Funding ProjectChinese Academy of Sciences[XDA11010102] ; Natural Science Foundation of China[41606018] ; Natural Science Foundation of China[41776035] ; Funds for Creative Research Groups of China[41421005] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406402]
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000427447000007
PublisherAMER METEOROLOGICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/158429
Collection海洋环流与波动重点实验室
Corresponding AuthorZheng, Jian
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.NOAA, Earth Syst Res Lab, Boulder, CO USA
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zheng, Jian,Wang, Faming,Alexander, Michael A.,et al. Impact of South Pacific Subtropical Dipole Mode on the Equatorial Pacific[J]. JOURNAL OF CLIMATE,2018,31(6):2197-2216.
APA Zheng, Jian,Wang, Faming,Alexander, Michael A.,&Wang, Mengyang.(2018).Impact of South Pacific Subtropical Dipole Mode on the Equatorial Pacific.JOURNAL OF CLIMATE,31(6),2197-2216.
MLA Zheng, Jian,et al."Impact of South Pacific Subtropical Dipole Mode on the Equatorial Pacific".JOURNAL OF CLIMATE 31.6(2018):2197-2216.
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