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| Satellite and in situ observations of a late winter phytoplankton bloom, in the northern Bay of Biscay Gohin, F.; Lampert, L.; Guillaud, J.-F.; Herbland, A.; Nézan, E. (2003). Satellite and in situ observations of a late winter phytoplankton bloom, in the northern Bay of Biscay. Cont. Shelf Res. 23(11-13): 1117-1141. https://dx.doi.org/10.1016/s0278-4343(03)00088-8
In: Continental Shelf Research. Pergamon Press: Oxford; New York. ISSN 0278-4343; e-ISSN 1873-6955, meer
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Aquatic communities > Plankton > Phytoplankton Remote sensing > Geosensing > Satellite sensing Coscinodiscus C.G. Ehrenberg, 1839 [WoRMS] ANE, Biscay Bay [Marine Regions] Marien/Kust |
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Outside of the bloom area, the phytoplankton photosynthesis was irradiance limited: inshore, because of the stronger attenuation of the light; offshore, because of the weak stratification. The hydrological conditions at the onset of the bloom were observed in the field, during the oceanographic cruise MODYCOT. However, without SeaWiFS, the only observations related to this major event in the primary production would have been those of the coastal phytoplankton network (REPHY (REseau PHYtoplankton)). Observed initially offshore by SeaWiFS, as early as March 5, 2001, the phytoplankton bloom extended onshore and was observed at REPHY stations by mid-March. On, March 15, fishermen reported that they were handicapped in trawling, the presence of mucilage in their nets carried clogging by very heavy slime. This mucilage has been shown to be produced by the diatom Coscinodiscus and, especially, C. wailesii. These observations were made as the main bloom was declining. A simple calculation, based upon the SeaWiFS chlorophyll concentration maps observed from March 5–16, shows that phosphate was probably totally depleted offshore, by March 16. The former bloom area appeared very poor in chlorophyll on the SeaWiFS image of April 7, which was the first image available after 3 weeks of an overcast sky. A second cruise undertaken at the end of April confirmed the phosphate depletion and the low chlorophyll concentration in that area. |
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