Assimilation of ATOVS data in the HIRLAM 3D-VAR System
Harald Schyberg,
Tomas Landelius,
Sigurdur Thorsteinsson,
Frank Thomas Tveter,
Ole Vignes,
Bjarne Amstrup,
Nils Gustafsson,
Heikki Järvinen,
Magnus Lindskog
Abstract
Abstract
With the implementation of the HIRLAM 3D-VAR system and the new
generation of instruments in the ATOVS system, there were expectations
of obtaining significant positive effects from the assimilation of
ATOVS, even in the limited-area setups in HIRLAM. Development projects
started at the Norwegian Meteorological Institute (DNMI) and at the
Swedish Meteorological and Hydrological Institute (SMHI) at the time
when ATOVS was ready for launch. This formed part of a coordinated
effort in the HIRLAM community to provide preprocessing and
assimilation of AMSU-A data in HIRLAM 3D-VAR. There have also been
important contributions from the Danish and Finnish Meteorological
Institutes (DMI and FMI). The development had benefit from some of the
work that had already taken place at other forecasting centers. For
instance, several processing modules developed elsewhere were made
available through EUMETSAT.
In this report we describe the developments that have taken place in
HIRLAM towards use of AMSU-A data. In the next chapters we give an
overview of the preprocessing and the implementation in 3D-VAR. Then
we describe various impact studies undertaken in several of the
HIRLAM countries. Finally we give an overview of ongoing work and
future developments, before concluding.
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