Respective Roles of the Guinea Current and Local Winds on the Coastal Upwelling in the Northern Gulf of Guinea
| العنوان: | Respective Roles of the Guinea Current and Local Winds on the Coastal Upwelling in the Northern Gulf of Guinea |
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| المؤلفون: | Bernard Bourlès, Pierrick Penven, V. Koné, Sandrine Djakouré, Jennifer Veitch |
| المساهمون: | Laboratoire de physique des océans (LPO), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [France-Ouest]) |
| المصدر: | Journal of Physical Oceanography Journal of Physical Oceanography, American Meteorological Society, 2017, 47 (6), pp.1367-1387. ⟨10.1175/JPO-D-16-0126.1⟩ Journal Of Physical Oceanography (0022-3670) (Amer Meteorological Soc), 2017-06, Vol. 47, N. 6, P. 1367-1387 |
| بيانات النشر: | HAL CCSD, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | 0106 biological sciences, VARIATION SAISONNIERE, 010504 meteorology & atmospheric sciences, PRODUCTION PRIMAIRE, UPWELLING, Tropical Atlantic, Oceanography, 01 natural sciences, COURANT COTIER, 14. Life underwater, Potential mechanism, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Advection, 010604 marine biology & hydrobiology, MODELISATION, Highly sensitive, Current (stream), CIRCULATION OCEANIQUE, Boundary layer, 13. Climate action, Climatology, Lateral extension, Upwelling, Geology |
| الوصف: | The northern Gulf of Guinea is a part of the eastern tropical Atlantic where oceanic conditions due to the presence of coastal upwelling may influence the regional climate and fisheries. The dynamics of this coastal upwelling is still poorly understood. A sensitivity experiment based on the Regional Oceanic Modeling System (ROMS) is carried out to assess the role of the detachment of the Guinea Current as a potential mechanism for coastal upwelling. This idealized experiment is performed by canceling the inertia terms responsible for the advection of momentum in the equations and comparing with a realistic experiment. The results exhibit two major differences. First, the Guinea Current is found to be highly sensitive to inertia, as it is no longer detached from the coast in the idealized experiment. The Guinea Current adjusts on an inertial boundary layer, the inertial terms defining its lateral extension. Second, the upwelling east of Cape Palmas disappears in absence of the Guinea Current detachment. This is in contrast with the upwelling east of Cape Three Points, which is still present. The results suggest that two different generation processes of the coastal upwelling need to be considered: the upwelling east of Cape Palmas (which is due to inertia, topographic variations, and advective terms effects resulting in important vertical pumping) and the upwelling east of Cape Three Points (which is principally induced by local winds). In addition to recent work ruling out the role of eddies, this study clarifies the processes responsible for this coastal upwelling. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0022-3670 1520-0485 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7dd013e204c94e697fb740b4051c1d1 https://hal.archives-ouvertes.fr/hal-02156642 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....b7dd013e204c94e697fb740b4051c1d1 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00223670 15200485 |
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