Uncovering a New Current: The Southwest MAdagascar Coastal Current
Open accessAbstract
Cruise data sets, satellite remote sensing observations, and model data analyses are combined to highlight the existence of a coastal surface poleward flow in the southwest of Madagascar: the Southwest MAdagascar Coastal Current (SMACC). The SMACC is a relatively shallow (<300 m) and narrow (<100 km wide) warm and salty coastal surface current, which flows along the south western coast of Madagascar toward the south, opposite to the dominant winds. The warm water surface signature of the SMACC extends from 22°S (upstream) to 26.4°S (downstream). The SMACC exhibits a seasonal variability: more intense in summer and reduced in winter. The average volume transport of its core is about 1.3 Sv with a mean summer maximum of 2.1 Sv. It is forced by a strong cyclonic wind stress curl associated with the bending of the trade winds along the southern tip of Madagascar. The SMACC directly influences the coastal upwelling regions south of Madagascar. Its existence is likely to influence local fisheries and larval transport patterns, as well as the connectivity with the Agulhas Current, affecting the returning branch of the global overturning circulation.
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Drifter experiments demonstrated potential connectivity between northern Mozambique and south-west Madagascar.
“Potential connectivity between northern Mozambique and south-west Madagascar was demonstrated in drifter experiments (Ramanantsoa et al. 2018).”
From Population genetics of the brooding coral Seriatopora hystrix reveals patterns of strong genetic differentiation in the Western Indian Ocean (2021) · cites this paper as Ramanantsoa et al. 2018
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- Authors
- Ramanantsoa, J. D., Penven, P., Krug, M., Gula, J., & Rouault, M.
- Affiliations
- University of Cape Town (ZA)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Ramanantsoa, Juliano D.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2018-02-22
- Volume
- 45
- Issue
- 4
- Pages
- 1930-1938
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W2789269210
- Cited by
- 35
- References
- 32
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 4 · 2022: 2 · 2021: 13 · 2020: 3 · 2019: 5 · 2018: 3
- FWCI
- 3.86
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geophysical Research Letters (publishedVersion)
- HAL (submittedVersion, other-oa)
- Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea) (submittedVersion)
- Funders
- University of Capetown
- Département Soutien et Formation, Institut de Recherche pour le Développement
- Western Indian Ocean Marine Science Association
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Coastal and Marine Dynamics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Ocean Waves and Remote Sensing
- Keywords
- Madagascar coast, seasonal variation, volume transport, wind stress curl, coastal upwelling, Agulhas Current, global overturning circulation, larval transport, fisheries
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