On the use of the Variational Adjoint Method in Ecosystem Modeling

Friday, May 3, 2002 - 10:30am - 11:15am
Keller 3-180
Yvette Spitz (Oregon State University)
The variational adjoint method has been used traditionally in atmospheric and oceanic circulation modeling to estimate initial and boundary conditions as well as model parameters (e.g, bottom drag coefficients, cloud parameters, etc). During the last decade, the availability of long term time series observations, such as from the Bermuda Atlantic Time Series (BATS) and the Hawaii Ocean Time series (HOT), and from process oriented studies (e.g. the North Atlantic Bloom Experiment (NABE), Equatorial Pacific experiment (EqPac)) has made the application of data assimilation techniques feasible to determine unknown ecosystem model parameters and their relative importance in controlling ecosystem dynamics. Using the BATS, HOT and the biogeochemical time series at the Belgian coastal station (reference station 330), we will illustrate the use of the variational adjoint method to determine not only the ecosystem model parameters but also the missing model pathways and external physical forcing such as advection/diffusion.