Gunson, J. J.. GRGS/LEGOS, gunson@pontos.cst.cnes.fr
Oschlies, A. J.. Institut fur Meereskunde an der Universitat Kiel,
Garçon, V. V.. GRGS/LEGOS, Veronique.garcon@cnes.fr

 
ASSIMILATION OF SATELLITE COLOUR DATA WITH A COUPLED PHYSICAL-BIOLOGICAL MODEL OF THE NORTH ATLANTIC OCEAN
 
A means of assimilating simulated satellite ocean colour data with a coupled physical--biological model of the North Atlantic Ocean is implemented. The coupled model consists of an eddy--permitting general circulation model derived from the WOCE Community Modelling Effort and a nitrogen-based, four-compartment NPZD marine ecosystem model. Many of the parameters in marine ecosystem models are poorly known and via assimilation, we hope to better constrain their values. A cost function measures the misfit between observed surface chlorophyll and modelled surface phytoplankton concentration. The chosen control variables are the model parameters involved in parameterisations of recycling as these are the most poorly--known. Simulated observations are taken while following several floats seeded in varying dynamical biogeochemical provinces of the North Atlantic model domain over a nine--month period. Twin experimental results show that the following parameters can be successfully recovered from simulated satellite ocean colour data: nitrate and detrital recycling parameters in the trade--wind domain, zooplankton parameters at higher latitudes (westerly--wind and polar domains), and the phytoplankton mortality rate in all regions. Some preliminary results using actual satellite colour data are also presented. SS44 Poster
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: SS44TU0751S