Simplified and regular physical parametrizations for incremental four-dimensional variational assilimation
Janiskova, M. ; Thépaut, J.-N. ; Geleyn, J.-F.
Année de publication
1999
A set of physical parameterizations has been developed for inclusion in <br>incremental four-dimensional variational assimilation (4D-Var). The goal<br> for this physical package is that it be simple, regular (for the <br>efficiency of the minimization in 4D-Var), and at the same time <br>realistic enough. The package contains a simplified computation of <br>radiative fluxes, vertical turbulent diffusion, orographic gravity <br>waves, deep convection, and stratiform precipitation fluxes. Its <br>tangent-linear and adjoint counterparts have also been developed. The <br>validations of the simplified physical parameterizations and of the <br>tangent-linear model with those included have been done. The importance <br>of regularization (removing some thresholds in physical <br>parameterizations that can affect the range of validity of the <br>tangent-linear approximation), which arises during validation of the <br>tangent-linear model, is assessed.</div>
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