The phytoplankton bloom response to wind events and upwelled nutrients during the CoOP WEST study |
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| Authors: | Frances P Wilkerson Adria M Lassiter Richard C Dugdale Albert Marchi Victoria E Hogue |
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| Institution: | aRomberg Tiburon Center, San Francisco State University, 3152 Paradise Drive, Tiburon, CA 94920, USA |
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| Abstract: | In the coastal waters off northern California, seasonal wind-driven upwelling supplies abundant nutrients to be processed by phytoplankton productivity. As part of the Coastal Ocean Processes: Wind Events and Shelf Transport (CoOP WEST) study, nutrients, CO2, size-fractionated chlorophyll, and phytoplankton community structure were measured in the upwelling region off Bodega Bay, CA, during May–June 2000, 2001 and 2002. The ability of this ecosystem to assimilate nitrate (NO3) and silicic acid/silicate (Si(OH)4) and accumulate particulate material (i.e. phytoplankton) was realized in all 3 years, following short events of upwelling-favorable winds, followed by periods of relaxed winds. This was observed as phytoplankton blooms, dominated by chlorophyll in cells greater than 5 μm in diameter, that reduced the ambient nutrients to zero. These communities were located over the near-shore shelf (<100 m depth) and were dominated by diatoms. An optimal window of 3–7 days of relaxed winds, following an upwelling pulse, was required for chlorophyll accumulation. The large-celled phytoplankton that result are likely important players in coastal new production and carbon cycling. |
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| Keywords: | Phytoplankton Diatom Upwelling Nutrients California Bodega Bay |
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