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Coastal topography and more specifically, the impact of local hydrography can significantly influence phytoplankton dynamics along the California coast. In San Luis Obispo Bay California, the local hydrography is influenced by the presence of a lee and proposed upwelling shadow in the northwest corner of the bay. These conditions allow for periods of unperturbed phytoplankton growth creating phytoplankton incubation areas. Phytoplankton dynamics including accumulation, advection, and composition were examined in San Luis Obispo Bay California from January to June 2004 using all the primary techniques of ocean monitoring encompassed in the coastal module of the Global Ocean Observing System. These techniques included remote sensing, autonomous sensing, discrete sampling and laboratory analysis. Results demonstrated that composition in the bay followed the typical seasonal shifts seen along the California coast. These findings reveal a community that was primarily dominated by dinoflagellates during the winter months giving way to a diatom dominated community in the spring and summer as upwelling season reached the coast. The model of cyclic phytoplankton accumulation and advection was shown to be valid and driven by both coastal upwelling as well as poleward displacement during periods of relaxation. In addition, due to presence of a stratified subsurface chlorophyll layer, the depth component was shown to be vital when attempting to access and sample phytoplankton communities in the bay. Map of the REMUS mission track used in this study. The transponder locations are shown in red. Missions were J-shaped in order for the vehicle to safely clear the tip of the break-wall (BW on figure) located in the northwest corner of the bay. B) REMUS mission depth map showing its surface position (flat line) as it moved offshore followed by its undulating return (jagged line). Sea surface temperature plot from 1/1/2004 through 6/30/2004 demonstrating low stable values during the winter and elevated fluctuating values during the summer. (Nearshore) measurements (blue) were reported from NOAA temperature gauge 9412110 while offshore measurements (pink) were reported from NOAA buoy 46062 (offshore). B) Difference plot demonstrating increases in SST fluctuation as summer approached. Temperature is reported as (nearshore-offshore). C) Wind data showing directional dominance from between 300 and 350 degrees. Data also demonstrates elongated periods between shifts reported during the late spring and summer. D) Wind speed data showing relaxation periods corresponding to shifts in wind direction.. showing chlorophyll a accumulation. G) Graphical extrapolation of chlorophyll a concentration vs. time. Red circle shows chlorophyll …

MECHANISMS FOR TEMPORAL CHANGE IN PHYTOPLANKTON COMPOSITION IN SAN LUIS OBISPO BAY CALIFORNIA