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Hydrodynamic conditions associated with the formation, maintenance and dissipation of a phytoplankton thin layer in a coastal upwelling system ArchiMer
Velo-suarez, Lourdes; Fernand, Liam; Gentien, Patrick; Reguera, Beatriz.
During May-June 2005, a 17-d cruise was carried out in Ria de Pontevedra (Galician Rias Baixas) to study the physical-biological interactions that may lead to subsurface aggregations of phytoplankton organisms in thin layers (TLs). Physical processes governed the initiation and development, maintenance, and decline of a diatom (toxin producing Pseudo-nitzschia spp. and Chaetoceros socialis) TL during an upwelling relaxation-upwelling-downwelling sequence. Differences in shear profiles appeared to lead to the formation of a TL during upwelling events. These results reveal that the coupling between maximum values of shear and buoyancy frequency can shape a subsurface chlorophyll maximum (SCM) into a TL. The effect of shear upon phytoplankton patches, which...
Tipo: Text Palavras-chave: Thin layer; Phytoplankton; Shear; Coastal upwelling system; Physical forcing; Coastal circulation.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11905/9765.pdf
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