globalchange  > 气候减缓与适应
DOI: 10.1029/2018JC013828
Scopus记录号: 2-s2.0-85052455282
论文题名:
SIDDIES Corridor: A Major East-West Pathway of Long-Lived Surface and Subsurface Eddies Crossing the Subtropical South Indian Ocean
作者: Dilmahamod A.F.; Aguiar-González B.; Penven P.; Reason C.J.C.; De Ruijter W.P.M.; Malan N.; Hermes J.C.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:8
起始页码: 5406
结束页码: 5425
语种: 英语
英文关键词: eddy corridor ; eddy demography ; heat/freshwater fluxes ; long-lived eddies ; South Indian Ocean ; surface and subsurface eddies
英文摘要: South Indian Ocean eddies (SIDDIES), originating from a high evaporation region in the eastern Indian Ocean, are investigated by tracking individual eddies from satellite data and co-located Argo floats. A subsurface-eddy identification method, based on its steric dynamic height anomaly, is devised to assign Argo profiles to surface eddies (surfSIDDIES) or subsurface eddies (subSIDDIES). These westward-propagating, long-lived features (>3 months) prevail over a preferential latitudinal band, forming a permanent structure linking the eastern to the western Indian Ocean, that we call the 'SIDDIES Corridor’. Key features have been revealed in the mean thermohaline vertical structure of these eddies. Anticyclonic SIDDIES are characterized by positive subsurface salinity anomalies, with subSIDDIES not exhibiting negative surface anomalies, as opposed to surfSIDDIES. Cyclonic subSIDDIES also occur, but their related salinity anomalies are weaker. SubSIDDIES exhibit two cores of different temperature polarities in their surface and subsurface levels. Cyclonic subSIDDIES have their cores at around 150-200 m depth along the 25.4-25.8 kg m−3 potential density layer with anticyclonic subSIDDIES having their cores at 250-300 m along the 26-26.4 kg m−3 density layer. The SIDDIES corridor acts as a zonal pathway for both eddy-types to advect water masses and biogeochemical properties across the basin. This study provides a new insight on heat/salt fluxes, showing that 58% (32%) of the total heat eddy-flux is ascribed to cyclonic (anticyclonic) subSIDDIES, respectively, in the eastern South Indian Ocean. Anticyclonic subSIDDIES have also been found to be the sole high-saline water eddy-conveyor toward the western Indian Ocean. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113363
Appears in Collections:气候减缓与适应

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作者单位: Department of Oceanography, University of Cape Town, Cape Town, South Africa; Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d'Oceanographie Physique et Spatial (LOPS), IUEM, Brest, France; South African Environmental Observation Network, Egagasini NodeRoggebaai, South Africa; NIOZ Royal Netherlands Institute for Sea Research, Department of Ocean Systems Sciences, Utrecht University, AB Den Burg, Texel, Netherlands; School of Marine Science and Policy College of Earth, Ocean and Environment, University of Delaware, Newark, DE, United States; Institute for Marine and Atmospheric Research, Utrecht University, CC Utrecht, Netherlands; Department of Oceanography, Nansen-Tutu Centre for Marine Environmental Research, University of Cape Town, Cape Town, South Africa; Nelson Mandela University, Port Elizabeth, South Africa

Recommended Citation:
Dilmahamod A.F.,Aguiar-González B.,Penven P.,et al. SIDDIES Corridor: A Major East-West Pathway of Long-Lived Surface and Subsurface Eddies Crossing the Subtropical South Indian Ocean[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)
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