SS3.02 Turbulence and Plankton Dynamics
Date: Wednesday, June 12, 2002
Time: 3:15:00 PM
Location: Saanich
 
BrownCA, Pacific Coastal Ecology Branch - US EPA, Newport, USA, brown.cheryl@epa.gov
Wainwright, T, C, NOAA/NMFS Northwest Fisheries Science Center, Newport, USA, thomas.wainwright@noaa.gov
Peterson, W, T, NOAA/NMFS Northwest Fisheries Science Center, Newport, USA, bill.peterson@noaa.gov
 
SIMULATING TEMPORAL VARIATIONS IN NUTRIENT, PHYTOPLANKTON, AND ZOOPLANKTON ON THE INNER OREGON SHELF
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The objective of this study is to use a numerical model to examine the linkages between physical processes and temporal variability in the plankton dynamics in a coastal upwelling system. To accomplish this objective, we used a nutrient-phytoplankton-zooplankton model coupled to a two-dimensional circulation model of the Oregon shelf. Model simulations were compared to observations of surface nitrate, chlorophyll-a, and integrated copepod biomass. During the 1999 upwelling season, temporal variations in nitrate, chlorophyll-a, and copepod biomass on the inner shelf (8 km from shore) off of Newport, Oregon were related to variations in wind stress, suggesting bottom up controls. During the 2000 upwelling season, the model reproduced variations in temperature, nitrate, and chlorophyll-a; however, the model did not reproduce variations in copepod biomass. Model simulations suggest that temporal variations in nitrate, chlorophyll-a, and copepod biomass in the inner shelf are related to variations in coastal wind forcing, rather than offshore wind forcing.