Application of model reduced 4D-Var to a 1D ecosystem model

作者：Pelc Joanna S^*; Simon Ehouarn; Bertino Laurent; El Serafy Ghada; Heemink Arnold W

来源：Ocean Modelling, 2012, 57-58: 43-58.

DOI：10.1016/j.ocemod.2012.09.003

• Data assimilation
• Ecosystem
• Parameter estimation
• Initial condition control
• Model reduced 4D-Var
• Twin experiment

The model reduced 4D-Var (Vermeulen and Heemink, 2006) is investigated to test its feasibility in ecosystem application. Ecological models are known for their high nonlinearity and issues with non-differentiability. However, since the method is performed in the reduced space, the implementation of the adjoint of the tangent linear approximation of the original model is not required. %26lt;br%26gt;Twin experiments are conducted in a 1D ecological model. Surface phytoplankton data are used, with 30% log-normally distributed measurement error. Three parameters are chosen for calibration. The method performs very well in the setup where a perfect initial condition is used, as well as for the combined parameter and initial condition estimation. A relatively well calibrated initial condition contributes to accurate parameter estimations. Not accounting for the wrongly assigned initial condition leads to incorrectly calibrated parameters.

• 出版日期2012-11