SS1.05 How Will Aquatic Ecosystems Respond to Climate Change?
Date: Tuesday, June 11, 2002
Time: 2:45:00 PM
Location: Oak Bay
 
VézinaAF, Bedford Institute of Oceanography, Dartmouth, Canada, vezinaa@dfo-mpo.gc.ca
Casault, B, , Bedford Institute of Oceanography, Dartmouth, Canada, casaultb@dfo-mpo.gc.ca
Pahlow, M, , Dalhousie University, Halifax, Canada, pahlowm@dfo-mpo.gc.ca
 
DEVELOPMENT OF A PLANKTON MODEL FOR INTERDISCIPLINARY STUDIES OF THE LINKS BETWEEN CLIMATE AND PLANKTON
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Monitoring of the NW Atlantic shelf since 1998 has documented strong interannual variability in physical conditions and in the timing, magnitude and spatial distribution of plankton production events (e.g. spring bloom). To better understand the processes responsible for this variability requires a physical-biological modelling system that can assimilate and interpret monitoring data. We report here on the development of a plankton model that would be suitable for such a system. We focus initially on the Scotian shelf off Halifax, Nova Scotia. Different PZND (phytoplankton zooplankton nutrients and detritus) model versions are compared against climatologies of chlorophyll and nutrients and against higher resolution time series at monitoring stations. For development purposes, the models are run in 0D mode, with mixed-layers prescribed from climatologies or from higher resolution observations. Inverse methods applied to simplified versions of the PZND models are used to estimate poorly known parameters and to improve the functional representation of key processes (e.g. grazing, sinking). The capability of PZND models to reproduce climate-related interannual variability on the Scotian shelf will be discussed.