Modelling the biological effects of a summer upwelling events in Lunenburg Bay, Canada
Vezina, A. F.
Cullen, J. J.
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Along the Atlantic coast of Nova Scotia (Canada), episodic summer upwelling events, induced by the prevailing southwesterly winds, are a significant source of physical and biological variability on the inner Scotian Shelf. Along the coast, they contribute to the flushing of nearshore systems (bays, estuaries) and influence their phytoplankton communities. However, the effects of summer upwelling events on phytoplankton biomass can be rather small in these environments. In Lunenburg Bay (Nova Scotia, Canada) for instance, in 2006 an early summer upwelling event resulted in a moderate two-fold increase in chlorophyll biomass ( similar to 2 mg m super(3)), which is a modest increase in comparison to other inshore systems. The objective of this study is to determine the underlying biological and physical processes (e.g. transport, grazing, primary production) responsible for the observed increase in phytoplankton biomass during an upwelling event in Lunenburg Bay. The Regional Ocean Modelling System (ROMS) coupled to a planktonic ecosystem model is used to study a sequence of summer upwelling events that occurred in Lunenburg Bay in 2006. Model results are compared with observations collected during a sampling campaign carried out during the upwelling sequence.
Laurent, A., A. F. Vezina, K. Fennel, and J. J. Cullen. "Modelling the biological effects of a summer upwelling events in Lunenburg Bay, Canada." CMOS Congress 2009 - Sea and Sky Come to Life, Halifax, Nova Scotia (Canada), 31 May - 4 June 2009.