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学科主题: Oceanography
题名: Fronts and surface zonal geostrophic current along 115 degrees E in the southern Indian Ocean
作者: He, ZG ; Dong, ZQ
通讯作者: dongzhaoqian@pric.gov.cn
关键词: southern Indian Ocean ; Antarctic Circumpolar Current ; zonal geostrophic current ; front
刊名: ACTA OCEANOLOGICA SINICA
发表日期: 2010
卷: 29, 期:5, 页:40552
收录类别: sci
部门归属: [Dong Zhaoqian] Polar Res Inst China, Shanghai 200136, Peoples R China; [He Zhigang] S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
项目归属: LED
摘要: Altimeter and in situ data are used to estimate the mean surface zonal geostrophic current in the section along 115 degrees E in the southern Indian Ocean, and the variation of strong currents in relation to the major fronts is studied. The results show that, in average, the flow in the core of Antarctic Circumpolar Current (ACC) along the section is composed of two parts, one corresponds to the jet of Subantarctic Front (SAF) and the other is the flow in the Polar Front Zone (PFZ), with a westward flow between them. The mean surface zonal geostrophic current corresponding to the SAF is up to 49 cm.s(-1) at 46 degrees S, which is the maximal velocity in the section. The eastward flow in the PFZ has a width of about 4.3 degrees in latitudes. The mean surface zonal geostrophic current corresponding to the Southern Antarctic Circumpolar Current Front (SACCF) is located at 59.7 degrees S with velocity less than 20 cm.s(-1). The location of zonal geostrophic jet corresponding to the SAF is quite stable during the study period. In contrast, the eastward jets in the PFZ exhibit various pattern, the primary Polar Front (PF1) shows its strong meridional shift and the secondary polar Front (PF2) does not always coincide with jet. The surface zonal geostrophic current corresponding to SAF has the significant periods of annual, semi-annual and four-month. The geostrophic current of the PFZ also shows significant periods of semi-annual and four-month, hut is out of phase with the periods of the SAP, which results in no notable semi-annual and four-month periods in the surface zonal geostrophic current in the core of the ACC. In terms of annual cycle, the mean surface zonal geostrophic current in the core of the ACC shows its maximal velocity in June.
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WOS记录号: WOS:000286127300001
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6177
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Recommended Citation:
He, ZG; Dong, ZQ.Fronts and surface zonal geostrophic current along 115 degrees E in the southern Indian Ocean,ACTA OCEANOLOGICA SINICA,2010,29(5):40552
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