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Complex small pelagic fish population patterns arising from individual behavioral responses to their environment ArchiMer
Brochier, Timothee; Auger, Pierre-amael; Pecquerie, Laure; Machu, Eric; Capet, Xavier; Thiaw, Modou; Mbaye, Baye Cheikh; Braham, Cheikh-baye; Ettahiri, Omar; Charouki, Najib; Sene, Ousseynou Ndaw; Werner, Francisco; Brehmer, Patrice.
Small pelagic fish (SPF) species are heavily exploited in eastern boundary upwelling systems (EBUS) as their transformation products are increasingly used in the world food chain. Management relies on regular monitoring, but there is a lack of robust theories for the emergence of the populations’ traits and their evolution in highly variable environments. This work aims to address existing knowledge gaps by combining physical and biogeochemical modelling with an individual life-cycle based model applied to round sardinella (Sardinella aurita) off northwest Africa, a key species for regional food security. Our approach focused on the processes responsible for seasonal migrations, spatio-temporal size-structure, and interannual biomass fluctuations....
Tipo: Text Palavras-chave: Small pelagic fish; Sardinella aurita; Fish migration; Eastern boundary upwelling system; Individual based biophysical models; Dynamic energy budget.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00433/54433/56088.pdf
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Impact des fines échelles spatio-temporelles de l'atmosphère sur le couplage entre océan hauturier et plateau continental dans un système d'upwelling de bord est ArchiMer
Desbiolles, Fabien.
This study focuses on the oceanic response to fine atmospheric spatial and temporal scales, and especially fine wind patterns in the Benguela and Canary upwelling systems. These regions are under the influence of local or regional wind, blowing parallel to the coast. The wind is the main driver of the cold-water upwelling and is modulated by several physical processes at various scales. The nature of the interactions with the atmosphere, the ocean and the adjacent continent differs according to these processes. For the past 20 years, outstanding efforts have been made in the description and understanding of the atmospheric conditions at the sea surface. An increasing number of space missions and major technical improvements have allowed refinement of the...
Tipo: Text Palavras-chave: Système d'upwelling de bord Est; Fines échelles atmosphériques; Interactions air-mer; Profil du vent à la côte; Diffusiométrie; Modélisation numérique; Eastern boundary upwelling system; Atmospheric fine scales; Air-sea interactions; Coastal wind profile; Scatterometry; Numerical model..
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00405/51693/52257.pdf
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Response of the Southern Benguela upwelling system to fine-scale modifications of the coastal wind ArchiMer
Desbiolles, Fabien; Blanke, Bruno; Bentamy, Abderrahim; Roy, C..
We analyze the results of a regional model of the Southern Benguela upwelling system forced by wind stress fields derived from QuikSCAT observations. Two different horizontal resolutions are considered for the wind stress: QS25 and QS50, corresponding to native 25 and 50 km grids, respectively. The differences between both products highlight the primary importance of fine-scale momentum fluxes for both the structure and intensity of the wind- and wind curl-driven upwelling. Using QS25, we show that the coastal Ekman transport is reduced, leading to a warmer SST and a reduced oceanic coastal jet. QS25 finer wind stress curl patterns also favor the development of a stronger and shallower poleward undercurrent. The addition of a coastal wind correction to...
Tipo: Text Palavras-chave: Eastern boundary upwelling system; Momentum flux forcing; Wind profile; Numerical modeling; Scatterometry.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00302/41339/40525.pdf
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