Seasonality of the Somali Current/Undercurrent system
文献类型：期刊论文
| 作者 | Zang, Nan1,2,3,4; Sprintall, Janet5; Ienny, Remi6; Wang, Fan1,2,3,4
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| 刊名 | DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 191页码:14 |
| 关键词 | Somali current Somali undercurrent Seasonal variability Baroclinic adjustment |
| ISSN号 | 0967-0645 |
| DOI | 10.1016/j.dsr2.2021.104953 |
| 通讯作者 | Sprintall, Janet(jsprintall@ucsd.edu) |
| 英文摘要 | The connected western boundary current system in the Arabian Sea plays an important role in the exchange of heat, mass, and freshwater and their distribution. Nonetheless, the dynamics and time scales of the processes and characteristics of this boundary current are not well understood because most prior measurements were only for a limited period or only resolved the surface circulation. Seasonality of the Somali Current (SC)/Undercurrent (SUC) system is investigated using a multi-decadal time series of ocean temperature and salinity profiles. The SC is driven principally by the seasonal monsoon winds, flowing southwestward in the winter monsoon (January-March), then reverses to northeastward in the summer monsoon (June-September). The subsurface southwestward SUC is found during the transition seasons in April-June and again in September-November. A vertical normal mode decomposition shows that the surface SC is mainly controlled by the seasonally varying first baroclinic mode and the barotropic component (a combined 86.5% of the total variance), while the SUC variations can be explained by the superimposition of the first and second baroclinic modes (a combined 75.9% of the total variance). Here we show that the occurrence of the countercurrent is not only due to the baroclinic adjustment caused by the wind forcing, but also a response to the complex salinity structure caused by the intrusion of high salinity water masses. Specifically, the presence of the salty water masses from the northern Arabian Sea during the boreal summer monsoon inhibits the southwestward flowing SUC and results in a baroclinic structure that supports a subsurface northeastward flow, aligned with the surface current. This suggests that salinity dynamics play a fundamental role in the circulation of the boundary current system of the Arabian Sea. |
| 资助项目 | NOAA's Global Ocean Monitoring and Observing Program[NA20OAR4320278] ; ONR[N00014-15-1-2313] ; National Key Research and Development Program[2017YFA0603201] ; State Key Program of National Natural Science of China[41730534] |
| WOS研究方向 | Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:000702608400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/176535]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 通讯作者 | Sprintall, Janet |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Ocean Dynam & Climate, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Coll Marine Sci, Qingdao 266071, Peoples R China 5.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA 6.Univ Bremen, MARAM, Bremen, Germany |
| 推荐引用方式 GB/T 7714 | Zang, Nan,Sprintall, Janet,Ienny, Remi,et al. Seasonality of the Somali Current/Undercurrent system[J]. DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,2021,191:14. |
| APA | Zang, Nan,Sprintall, Janet,Ienny, Remi,&Wang, Fan.(2021).Seasonality of the Somali Current/Undercurrent system.DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,191,14. |
| MLA | Zang, Nan,et al."Seasonality of the Somali Current/Undercurrent system".DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY 191(2021):14. |
入库方式： OAI收割
来源：海洋研究所
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