The deep meridional overturning circulation in the Indian Ocean inferred from the GECCO synthesis
Wang, W; Kohl, A; Stammer, D; weiqiang.wang@scsio.ac.cn
2012
发表期刊DYNAMICS OF ATMOSPHERES AND OCEANS
ISSN0377-0265
卷号58页码:44-61
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.
部门归属[Wang, Weiqiang] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Wang, Weiqiang; Koehl, Armin; Stammer, Detlef] Univ Hamburg, Ctr Erdsystemforsch & Nachhaltigkeit, Inst Meereskunde, Hamburg, Germany
关键词Deep Meridional Overturning Circulation The Indian Ocean Interannual Variability
学科领域Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences ; Oceanography
语种英语
资助项目LTO
WOS记录号WOS:000311927900003
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10049
专题热带海洋环境国家重点实验室(LTO)
通讯作者weiqiang.wang@scsio.ac.cn
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Wang, W,Kohl, A,Stammer, D,et al. 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,&weiqiang.wang@scsio.ac.cn.(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.
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