Coherent observations operators for surface data assimilation, with application to snow depth

Urban, B.

Année de publication
1996

A method to derive observation operators for surface data assimilation <br>is presented. It is based on a statistical modeling of the physical <br>processes behavior near the surface. It provides a general framework to <br>design such observation operators. The method avoids the problems that <br>arise with vertical interpolation and extrapolation due to the <br>difference between real orography and model orography. Examples are <br>given for surface temperature and snow depth analysis. The last example <br>is then implemented in the French global operational model Arpège, and <br>full data assimilation experiments are presented with and without the <br>snow-depth observation operational. The impact of the method is <br>positive, and its amplitude is compared with the one produced by another<br> common model change, namely physical parameterizations modification.</div>

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