Origin and fate of a bloom of Skeletonema costatum during a winter upwelling/downwelling sequence in the Ría de Vigo (NW Spain)
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AuthorsÁlvarez-Salgado, X.A. (Xosé Antón); Nieto-Cid, M. (Mar); Piedracoba, S.; Crespo, B.G.; Gago, J.; Brea, S.; Teixeira, I.G.; Garrido, J.L.; Rosón, G.; Castro, C.G.; Gilcoto, M.
winter oceanic circulation
Ría de Vigo
The onset, development and decay of a winter bloom of the marine diatom Skeletonema costatum was monitored during a 10 d period in the coastal upwelling system of the Rı´a de Vigo (NW Spain). The succession of upwelling, relaxation and downwelling-favorable coastal winds with a frequency of 10 –20 d is a common feature of the NW Iberian shelf. The onset of the bloom occurred during an upwelling-favorable 1⁄2 wk period under winter thermal inversion conditions. The subsequent 1⁄2 wk coastal wind relaxation period allowed development of the bloom (gross primary production reached 8gCm–2 d–1) utilizing nutrients upwelled during the previous period. Finally, downwelling during the following 1⁄2 wk period forced the decay of the bloom through a combination of cell sinking and downward advection.
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