The SARAL/AltiKa mission is a complement of the Jason altimeter series. A two-channels (23.8 GHz and 37 GHz) microwave radiometer (MWR) is combined to the altimeter in order to correct the altimeter range for the excess path delay (referred as WTC for wet tropospheric correction.
First, the in-flight calibration of AltiKa MWR is assessed from a systematic comparison to other radiometers using a complete set of metrics (comparison to simulations and over geophysical targets). Then the “mixed” empirical approach successfully used for Envisat shows nonoptimal
performances for the WTC retrieval. In order to find the potential sources of issues, this method is compared to a purely empirical relationship established between measured brightness temperatures (TB) and altimeter backscattering coefficient () on one hand and modeled WTC on the other hand. Various retrieval configurations for both AltiKa MWR and advanced microwave radiometer (AMR) on Jason-2, are for the first time systematically compared with respect to their
performances against the variance of sea surface height differences at crossovers. Finally, the issues on the “mixed” approach are attributed to the differences between simulated and measured
at Ka-band. Now, a configuration of the empirical approach proved to have performances closed to what is initially expected with the “mixed” approach.
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wet tropospheric correction
Document Type: Research Article
Collecte Localisation Satellites (CLS), Space Oceanography Division, Ramonville, St-Agne, France
Laboratoire d'Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN), Centre National de la Recherche Scientifique (CNRS), Paris, France
Centre National d'Etudes Spatiales (CNES), Toulouse, France
Publication date: September 10, 2015
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