D31 Surface moisture impact study.
This is part of work-package 5100, the purpose of which are to refine
methods for surface humidity assimilation.
- To develop observation operators, including observation error
and quality control algorithms, for
assimilation of moisture information (2 meter relative humidity) from
stations (SYNOP) in variational data assimilation.
- To test the impact of using moisture information from surface
in variational data assimilation.
Methodology/Work Description: The variational data assimilation
to be applied by Partners SMHI and INM already includes preliminary
operators based non-linear, tangent-linear and adjoint versions of the
for 2-meter relative humidity from an earlier version of the forecast
These observation operators will be upgraded to be consistent with the
version of the forecast model and complemented with models for
and representativity errors. A data assimilation and forecast
will be carried out over a period of 2 weeks to test the impact of
relative humidity observations.
The impact study has been made by partner INM. The results are described in
the report d31-rh2-impact.pdf.
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