HR: 0830h
AN: OS31D-54    [PDF]
TI: Ecosystem Modeling of the Central California Coastal Upwelling System
AU: * Shi, L
EM: leishi@maine.edu
AF: University of Maine, School of Marine Sciences, 5741 Libby Hall, Orono, ME 04469 United States
AU: Chai, F
EM: fchai@maine.edu
AF: University of Maine, School of Marine Sciences, 5741 Libby Hall, Orono, ME 04469 United States
AU: Chavez, F
EM: chfr@mbari.org
AF: MBARI, 7700 Sandholdt Rd., Moss Landing, CA 95039 United States
AU: Li, Z
EM: zhijin@pacific.jpl.nasa.gov
AF: Jet Propulsion Laboratory, M/S 300-323, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Chao, Y
EM: yi.chao@jpl.nasa.gov
AF: Jet Propulsion Laboratory, M/S 300-323, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Barber, R T
EM: rbarber@duke.edu
AF: Duke Unviersity, Duke Marine Lab, 135 Duke Marine Lab Road, Beaufort, NC 28516 United States
AU: McWilliams, J C
EM: jcm@atmos.ucla.edu
AF: UCLA, Dept. of Atmospheric Sciences, 405 Hilgard Ave., Los Angeles, CA 90095 United States
AB: In aiming to investigate the central California coastal upwelling ecosystem, especially in the Monterey Bay region, a 11-compartment ecosystem model has been established and coupled with a physical model which is based on the Regional Ocean Modeling System (ROMS). The current model domain covers the Monterey Bay with approximately 1000 km along shore and 500 km offshore. The horizontal resolution is approximately 5 km, and there are 20 sigma layers. The ecosystem model was originally developed by Chai and his collaborators for the equatorial Pacific, and it consists of multiple nutrients and plankton groups, two detritus compartments, and total CO2. The biological model parameters have been adjusted for the coastal upwelling system based upon the time series observations in the Monterey Bay region. The most recent model development has added dissolved oxygen in order to maximize the usage of the observational data and constrain the ecosystem model performance. The physical-biological model is forced with the QuikSCAT wind, heat and fresh-water fluxes derived from the Comprehensive Ocean-Atmosphere Data Set (COADS). Starting from the observed hydrographic observations of temperature and salinity and nutrients, we integrate the 3D physical-biological model for five years forced with the monthly climatological air-sea fluxes and observed surface photosynthetically available radiation (PAR). The last two years, the model simulation is used to define the climatological mean seasonal cycle. The main goal of the model investigation is to simulate and understand the seasonal cycle of nutrients and phytoplankton dynamics, and importantly the carbon flux in the coastal upwelling region. The model results have been compared with the time series observations in the Monterey Bay region (C1, M1, M2) and transect surveys data (CalCOFI Line 67). The modeled seasonal cycle of the ecosystem will be presented. The nutrients and carbon fluxes will be quantified.
DE: 4815 Ecosystems, structure and dynamics
DE: 4845 Nutrients and nutrient cycling
DE: 4255 Numerical modeling
DE: 4805 Biogeochemical cycles (1615)
DE: 4806 Carbon cycling
SC: OS
MN: 2002 Ocean Sciences Meeting