Infrared atmospheric sounding interferometer data information content ; instrument characterization and the impact of a priori information
Prunet, P. ; Cassé, V. ; Thépaut, J.-N.
Année de publication
2001
The use of linear estimation for the study of the information content of
a given satellite radiance data set for temperature and humidity
profile retrievals is first reviewed. A particular formulation of the
retrieval approach is then used to obtain an intrinsic characterisation
of the Infrared Atmospheric Sounding Interferometer (IASI) data set, in
terms of accuracy versus vertical resolution of retrieved profiles. The
performance of the IASI instrument alone is analysed and compared to
that of the currently-used HIRS-TOVS. The problem is then regularized by
addition of a priori independent information to the initial data set.
The potential use of IASI data for some particular choices of the a
priori information associated with practical problems such as profile
inversion or data assimilation for weather forecasting is analysed. The
approach is finally used to derive an empirical objective framework to
define the vertical discretization adapted to these problems.</div>
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