IOCAS-IR  > 海洋环流与波动重点实验室
Intensification and Dynamics of the Westward Equatorial Undercurrent During the Summers of 1998 and 2016 in the Indian Ocean
Huang, Ke1,2,3; Wang, Dongxiao4,5; Chen, Gengxin1,3; Nagura, Motoki6; Han, Weiqing7; McPhaden, Michael J.8; Feng, Ming9; Chen, Ju1; Wu, Ying10; Zhang, Xiaolin11; Li, Yuanlong12; Xie, Qiang13; Wang, Weiqiang1,3; Zhou, Feng2
2022-10-28
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume49Issue:20Pages:11
Corresponding AuthorWang, Dongxiao(dxwang@scsio.ac.cn) ; Chen, Ju(jchen@scsio.ac.cn)
AbstractUsing mooring observations and reanalysis, we show that anomalously strong westward Equatorial Undercurrent (wEUC) developed in June-July in 2016 and 1998 in the Indian Ocean, which coincided with extreme Indian Ocean Dipole (IOD) and El Nino events. Simulations show that equatorial Kelvin and Rossby waves were excited by winds associated with El Nino and positive IOD events during 2015 and 1997, and their negative phases during 2016 and 1998. The constructive relationship between the delayed-time contributions of eastern-boundary-reflected-waves that excited by the easterlies in 2015 and 1997 and the direct contributions of wind-forced-waves that excited by the westerlies in 2016 and 1998 resulted in the intensified wEUC. Slow intermediate-order baroclinic-modes, rather than fast low-order baroclinic-modes, dominated the strong wEUC. The eastern-boundary-reflected-waves dominated in 1997-1998 and directly wind-forced-waves dominated in 2015-2016. Our results emphasize the importance of constructive interactions of the directly-wind-forced and boundary-reflected waves in driving the interannual variability of Indian Ocean wEUC.
Keywordequatorial undercurrent tropical Indian Ocean equatorial dynamic Indian Ocean Dipole baroclinic waves equatorial waves
DOI10.1029/2022GL100168
Indexed BySCI
Language英语
Funding ProjectSecond Tibetan Plateau Scientific Expedition and Research program[2019QZKK0102] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20060502] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000] ; National Natural Science foundation of China[41976016] ; National Natural Science foundation of China[42076021] ; National Natural Science foundation of China[42230402] ; National Natural Science foundation of China[42176026] ; National Natural Science foundation of China[41976024] ; National Natural Science foundation of China[41906147] ; National Natural Science foundation of China[42276022] ; National Natural Science foundation of China[41876017] ; Guangdong Basic and Applied Basic Research Foundation[2021A1515011534] ; Youth Innovation Promotion Association CAS[Y2021093] ; Joint Advanced Marine and Ecological Studies (JAMES) project of the Global Change and Air-Sea interaction II Program[GASI-04-WLHY-03] ; State Key Laboratory of Tropical Oceanography[LTOZZ2002] ; State Key Laboratory of Tropical Oceanography[LTOZZ2101] ; State Key Laboratory of Satellite Ocean Environment Dynamics, SIO, MNR[QNHX2203] ; China-Sri Lanka Joint Center for Education & Research, Chinese Academy of Sciences ; High-Performance Computing Division
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000871467400001
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/180549
Collection海洋环流与波动重点实验室
Corresponding AuthorWang, Dongxiao; Chen, Ju
Affiliation1.South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
2.Minist Nat Resources, State Key Lab Satellite Ocean Environm Dynam, Inst Oceanog 2, Hangzhou, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou, Peoples R China
4.Sun Yat Sen Univ, Sch Marine Sci, Zhuhai, Peoples R China
5.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China
6.Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa, Japan
7.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
8.NOAA, Pacific Marine Environm Lab, 7600 Sand Point Way Ne, Seattle, WA 98115 USA
9.CSIRO Oceans & Atmosphere, Crawley, WA, Australia
10.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China
11.Kyushu Univ, Fukuoka, Japan
12.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
13.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Huang, Ke,Wang, Dongxiao,Chen, Gengxin,et al. Intensification and Dynamics of the Westward Equatorial Undercurrent During the Summers of 1998 and 2016 in the Indian Ocean[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(20):11.
APA Huang, Ke.,Wang, Dongxiao.,Chen, Gengxin.,Nagura, Motoki.,Han, Weiqing.,...&Zhou, Feng.(2022).Intensification and Dynamics of the Westward Equatorial Undercurrent During the Summers of 1998 and 2016 in the Indian Ocean.GEOPHYSICAL RESEARCH LETTERS,49(20),11.
MLA Huang, Ke,et al."Intensification and Dynamics of the Westward Equatorial Undercurrent During the Summers of 1998 and 2016 in the Indian Ocean".GEOPHYSICAL RESEARCH LETTERS 49.20(2022):11.
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