DOI: 10.1002/2013GL057887
论文题名: Salinity dominance on the Indian Ocean Eastern Gyral current
作者: Menezes V.V. ; Phillips H.E. ; Schiller A. ; Domingues C.M. ; Bindoff N.L.
刊名: Geophysical Research Letters
ISSN: 0094-8385
EISSN: 1944-8116
出版年: 2013
卷: 40, 期: 21 起始页码: 5716
结束页码: 5721
语种: 英语
英文关键词: EGC
; fresh
; front
; Indonesian Throughflow Water
; salty
; subtropical water
Scopus关键词: EGC
; fresh
; front
; Indonesian throughflow
; salty
; Subtropical water
; Earth sciences
; Geophysics
; Ocean currents
; air-sea interaction
; dominance
; Ekman transport
; geostrophic flow
; salinity
; temperature effect
; throughfall
; upper ocean
; wind-driven circulation
; Indian Ocean
; Leeuwin Current
英文摘要: This study demonstrates the importance of salinity gradients to the formation of the Eastern Gyral Current (EGC) in the South Indian Ocean. The EGC flows eastward near 15â̂̃S, opposite to the direction predicted by classical theories of wind-driven circulation and is a source of water for the Leeuwin Current. In the upper ocean, a strong salinity front exists between fresh water from the Indonesian Throughflow (ITF) in the South Equatorial Current (SEC) and salty subtropical waters. In that region, salinity overwhelms the temperature contribution to density gradients, generating eastward geostrophic shear and establishing the EGC. Without the salinity front the EGC cannot be maintained: If the salinity contribution is neglected in the calculation of geostrophic currents, the EGC vanishes. Our observational analysis associated with the fact that both Sverdrup and Ekman theories produce westward flows in the region strongly supports the idea that the EGC is a salinity-driven current. Key Points Salinity overwhelms the temperature contribution to density gradients Without the salinity front the EGC cannot be maintained Our results strongly supports the idea that the EGC is a salinity-driven current ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887294822&doi=10.1002%2f2013GL057887&partnerID=40&md5=b6e5d75891fa9ef849dfc32edaeedc2f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5649
Appears in Collections: 气候减缓与适应
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作者单位: CSIRO/UTAS Quantitative Marine Science Program, Hobart, Australia
Recommended Citation:
Menezes V.V.,Phillips H.E.,Schiller A.,et al. Salinity dominance on the Indian Ocean Eastern Gyral current[J]. Geophysical Research Letters,2013-01-01,40(21).