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