Intensification and Dynamics of the Westward Equatorial Undercurrent During the Summers of 1998 and 2016 in the Indian Ocean

被引：3

作者：

Huang, Ke ^{[1
,2
,3
]}

Wang, Dongxiao ^{[4
,5
]}

Chen, Gengxin ^{[1
,3
]}

Nagura, Motoki ^{[6
]}

Han, Weiqing ^{[7
]}

McPhaden, Michael J. ^{[8
]}

Feng, Ming ^{[9
]}

Chen, Ju ^{[1
]}

Wu, Ying ^{[10
]}

Zhang, Xiaolin ^{[11
]}

Li, Yuanlong ^{[12
]}

Xie, Qiang ^{[13
]}

Wang, Weiqiang ^{[1
,3
]}

Zhou, Feng ^{[2
]}

机构：

[1] 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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 20期

基金：

中国国家自然科学基金;

关键词：

equatorial undercurrent; tropical Indian Ocean; equatorial dynamic; Indian Ocean Dipole; baroclinic waves; equatorial waves; WESTERN BOUNDARY REFLECTION; SEA-LEVEL VARIATIONS; INTERANNUAL VARIABILITY; ZONAL CURRENTS; SEASONAL CIRCULATION; COASTAL CURRENT; ROSSBY WAVES; TIME-SCALE; PACIFIC; CLIMATE;

D O I：

10.1029/2022GL100168

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Using 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.

引用

页数：11

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