The deep meridional overturning circulation in the Indian Ocean inferred from the GECCO synthesis
文献类型：期刊论文
| 作者 | Wang, W ; Kohl, A ; Stammer, D |
| 刊名 | DYNAMICS OF ATMOSPHERES AND OCEANS
 |
| 出版日期 | 2012 |
| 卷号 | 58页码:44-61 |
| 关键词 | Deep meridional overturning circulation The Indian Ocean Interannual variability |
| ISSN号 | 0377-0265 |
| 通讯作者 | weiqiang.wang@scsio.ac.cn |
| 中文摘要 | The deep time-varying meridional overturning circulation (MOC) in the Indian Ocean in the German "Estimating the Circulation and Climate of the Ocean" consortium efforts (GECCO) ocean synthesis is being investigated. An analysis of the integrated circulation suggests that, on time average, 2.1 Sv enter the Indian Ocean in the bottom layer (>3200m) from the south and that 12.3 Sv leave the Indian Ocean in the upper and intermediate layers (<1500 m), composed of the up-welled bottom layer inflow water, augmented by 9.6 Sv Indonesian Throughflow (ITF) water. The GECCO time-mean results differ substantially from those obtained by inverse box models, which being based on individual hydrographic sections and due to the strong seasonal cycle are susceptible to aliasing. The GECCO solution shows a large seasonal variation in its deep MOC caused by the seasonal reversal of monsoon-related wind stress forcing. The associated seasonal variations of the deep MOC range from 7 Sv in boreal winter to 3 Sv in summer. In addition, the upper and bottom transports across the 34 S section show pronounced interannual variability with roughly biennial variations superimposed by strong anomalies during each La Nina phase as well as the ITF, which mainly affect the upper layer transports. On decadal and longer timescale, the meridional overturning variability as well as long-term trends differs before and after 1980. GECCO shows a stable trend for the period 1960-1979 and substantial changes in the upper and bottom layer for the period 1980-2001. By means of an extended EOF analysis, the importance of Ekman dynamics as driving forces of the deep MOC of the Indian Ocean on the interannual timescale is highlighted. The leading modes of the zonal and meridional wind stress favour a basin-wide meridional overturning mode via Ekman upwelling or downwelling mostly in the central and eastern Indian Ocean. Moreover, tropical zonal wind stress along the equator and alongshore wind stress off the Sumatra-Java coast contribute to the evolution of the Indian Ocean dipole (IOD) events. (C) 2012 Elsevier B.V. All rights reserved. |
| 学科主题 | Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:000311927900003 |
| 公开日期 | 2013-08-28 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/10049]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 推荐引用方式 GB/T 7714 | Wang, W,Kohl, A,Stammer, D. The deep meridional overturning circulation in the Indian Ocean inferred from the GECCO synthesis[J]. DYNAMICS OF ATMOSPHERES AND OCEANS,2012,58:44-61. |
| APA | Wang, W,Kohl, A,&Stammer, D.(2012).The deep meridional overturning circulation in the Indian Ocean inferred from the GECCO synthesis.DYNAMICS OF ATMOSPHERES AND OCEANS,58,44-61. |
| MLA | Wang, W,et al."The deep meridional overturning circulation in the Indian Ocean inferred from the GECCO synthesis".DYNAMICS OF ATMOSPHERES AND OCEANS 58(2012):44-61. |
入库方式： OAI收割
来源：南海海洋研究所
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