Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean | |
Chen, Gengxin1,2; Han, Weiqing2; Li, Yuanlong3,4; Yao, Jinglong1; Wang, Dongxiao1 | |
刊名 | JOURNAL OF PHYSICAL OCEANOGRAPHY |
2019 | |
卷号 | 49期号:1页码:85-101 |
关键词 | Indian Ocean Kelvin waves Ocean circulation Rossby waves Ocean models Intraseasonal variability |
ISSN号 | 0022-3670 |
DOI | 10.1175/JPO-D-18-0151.1 |
通讯作者 | Wang, Dongxiao(dxwang@scsio.ac.cn) |
英文摘要 | By analyzing in situ observations and conducting a series of ocean general circulation model experiments, this study investigates the physical processes controlling intraseasonal variability (ISV) of the Equatorial Undercurrent (EUC) of the Indian Ocean. ISV of the EUC leads to time-varying water exchanges between the western and eastern equatorial Indian Ocean. For the 2001-14 period, standard deviations of the EUC transport variability are 1.92 and 1.77 Sv (1 Sv 10(6) m(3) s(-1)) in the eastern and western basins, respectively. The ISV of the EUC is predominantly caused by the wind forcing effect of atmospheric intraseasonal oscillations (ISOs) but through dramatically different ocean dynamical processes in the eastern and western basins. The stronger ISV in the eastern basin is dominated by the reflected Rossby waves associated with intraseasonal equatorial zonal wind forcing. It takes 20-30 days to set up an intraseasonal EUC anomaly through the Kelvin and Rossby waves associated with the first and second baroclinic modes. In the western basin, the peak intraseasonal EUC anomaly is generated by the zonal pressure gradient force, which is set up by radiating equatorial Kelvin and Rossby waves induced by the equatorial wind stress. Directly forced and reflected Rossby waves from the eastern basin propagate westward, contributing to intraseasonal zonal current near the surface but having weak impact on the peak ISV of the EUC. |
资助项目 | National Key R&D Program of China[2017YFC1405103] ; National Key R&D Program of China[XDA 20060502] ; NSFC[41676010] ; NSFC[41822602] ; State Key Laboratory of Tropical Oceanography SCSIO[LTOZZ1702] ; Youth Innovation Promotion Association CAS[2017397] ; Guangzhou Science and Technology Foundation[201804010133] |
WOS研究方向 | Oceanography |
语种 | 英语 |
出版者 | AMER METEOROLOGICAL SOC |
WOS记录号 | WOS:000454494400001 |
内容类型 | 期刊论文 |
源URL | [http://ir.qdio.ac.cn/handle/337002/155920] |
专题 | 海洋研究所_海洋生态与环境科学重点实验室 |
通讯作者 | Wang, Dongxiao |
作者单位 | 1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 2.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA 3.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Guangzhou, Guangdong, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China |
推荐引用方式 GB/T 7714 | Chen, Gengxin,Han, Weiqing,Li, Yuanlong,et al. Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(1):85-101. |
APA | Chen, Gengxin,Han, Weiqing,Li, Yuanlong,Yao, Jinglong,&Wang, Dongxiao.(2019).Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(1),85-101. |
MLA | Chen, Gengxin,et al."Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.1(2019):85-101. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论