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General Session 1: Physical oceanic processes: Dynamics and physical-biological-biogeochemical interactions |
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Modeling nutrient and plankton dynamics of the San Francisco Bay
Monday 9th @ 1030-1045
Conference Hall
Fei Chai* , Second Institute of Oceanography, State Oceanic Administration
QianQian Liu, University of Maine, USA
Richard Dugdale, San Francisco State University, USA
Frances Wilkerson, San Francisco State University, USA
Yi Chao, Remote Sensing Solutions, USA
Huijie Xue, University of Maine, USA
Presenter Email: fchai@sio.org.cn
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| To assist the ecosystem-based management and ecological risk assessment for the California fisheries and water management, a coupled physical-biogeochemical model is used to study the nutrient cycles and plankton dynamics in San Francisco Bay (SFB). The biogeochemical model is based on the Carbon, Silicate and Nitrogen Ecosystem (CoSiNE) model, and coupled to an unstructured grid, Semi-Implicit Cross-scale Hydroscience Integrated System Model (SCHISM). The model reproduces the spatial and temporal variability of nutrients and plankton biomass, and its physical and biogeochemical performances were successfully tested by comparing with USGS observations and observations at mooring locations. We investigate the biogeochemical characters of SFB during wet and dry years by modulating the major rivers’ input. River discharges from the Sacramento and San Joaquin Rivers affect the biomass in North Bay through a competition between the washout effect and the rivers’ dilution of NH4 concentration. In addition, the model examines the bay’s response to change of nutrient loads from rivers and wastewater treatment plants, NH4 inhibition parameter, and bottom grazing through a series of sensitivity experiments. The nitrogen transport and budget were calculated under the different conditions and discussed in terms of net nitrogen export from SFB to the coastal ocean. |
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