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| DOI | 10.1029/2019JC015874 |
| Variability in Meridional Transport of the Subtropical Circulation in the South Indian Ocean for the Period From 2006 to 2017 | |
| Nagura M. | |
| 发表日期 | 2020 |
| ISSN | 21699275 |
| 卷号 | 125期号:6 |
| 英文摘要 | This study estimates variability in meridional velocity and transport in the interior of the south Indian Ocean using in situ hydrographic observations, satellite altimetry, and two reanalysis products for the period from 2006 to 2017. Previous studies used the zonal difference of satellite sea surface height (SSH) between the western and eastern parts of the basin as an index to variability in basinwide meridional geostrophic transport. This study estimates meridional geostrophic velocity in the upper 1,800 m from in situ observations and examines its vertical structure. Results show that zonal SSH difference represents a surface trapped variability in meridional velocity, the amplitude of which is large in the upper 250 m and decreases to zero at about 1,250 m depth. Zonal SSH difference is significantly correlated with zonally integrated meridional transport relative to 1,000 m depth. It is likely that wind variability both in the south Indian Ocean and tropical Pacific Ocean is responsible for this surface trapped variability, as is suggested by past studies. Results of this study also show meridional velocity variability at subsurface, which peaks in magnitude at about 400 to 800 m depths. This variability is not correlated with zonal SSH difference and represents decadal weakening of northward transport of the subtropical circulation for the analysis period. This subsurface variability can contribute to interannual variability in mode water transport, but its detailed forcing mechanism is not known and warrants a further study. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | interannual to decadal variability; meridional transport; sea surface height; south Indian Ocean; subsurface variability; subtropical circulation |
| 语种 | 英语 |
| 来源期刊 | Journal of Geophysical Research: Oceans
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/186825 |
| 作者单位 | Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan |
| 推荐引用方式 GB/T 7714 | Nagura M.. Variability in Meridional Transport of the Subtropical Circulation in the South Indian Ocean for the Period From 2006 to 2017[J],2020,125(6). |
| APA | Nagura M..(2020).Variability in Meridional Transport of the Subtropical Circulation in the South Indian Ocean for the Period From 2006 to 2017.Journal of Geophysical Research: Oceans,125(6). |
| MLA | Nagura M.."Variability in Meridional Transport of the Subtropical Circulation in the South Indian Ocean for the Period From 2006 to 2017".Journal of Geophysical Research: Oceans 125.6(2020). |
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