globalchange  > 气候减缓与适应
DOI: 10.1029/2017JC013602
Scopus记录号: 2-s2.0-85050810425
论文题名:
Agulhas Current Meanders Facilitate Shelf-Slope Exchange on the Eastern Agulhas Bank
作者: Malan N.; Backeberg B.; Biastoch A.; Durgadoo J.V.; Samuelsen A.; Reason C.; Hermes J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:7
起始页码: 4762
结束页码: 4778
语种: 英语
英文关键词: Agulhas Current ; eddy-shelf interaction ; ocean modeling ; upwelling
英文摘要: Large solitary meanders are arguably the dominant mode of variability in the Agulhas Current. Observational studies have shown that these large meanders are associated with strong upwelling velocities and affect the shelf circulation for over 100 days per year. Here 10-year time series from two ocean general circulation models are used to create a composite picture of the Agulhas Current and its interactions with the shelf circulation in meandering and nonmeandering modes. Both models show good agreement with the size, propagation speed, and frequency of observed meanders. These composite meanders are then used to examine the response of shelf waters to the onset of large meanders, with the use of model output enabling the dynamics at depth to be explored. Results show a composite mean warming of up to 3°C of depth-averaged temperature along the shelf edge associated with an intrusion of the current jet onto the shelf driven by an intensification of the flow along the leading edge of large meanders. However, this intensification of flow results in cooling of bottom waters, driving cold events at the shelf break of <10°C at 100 m. Thus, the intensification of the current jet associated with large meander events appears to drive strong up and downwelling events across the inshore front of the Agulhas Current, facilitating shelf-slope exchange. ©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/113560
Appears in Collections:气候减缓与适应

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作者单位: SAEON Egagasini Node, Cape Town, South Africa; Department of Oceanography, University of Cape Town, Cape Town, South Africa; Nansen-Tutu Centre for Marine Environmental Research, University of Cape Town, Cape Town, South Africa; Coastal Systems, Natural Resources and the Environment, Council for Scientific and Industrial Research, Stellenbosch, South Africa; Nansen Environmental and Remote Sensing Center, Bergen, Norway; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Nelson Mandela University, Port Elizabeth, South Africa

Recommended Citation:
Malan N.,Backeberg B.,Biastoch A.,et al. Agulhas Current Meanders Facilitate Shelf-Slope Exchange on the Eastern Agulhas Bank[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(7)
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