Multimission merging for High Resolution Altimetry. Support to assimilation
Despite all the progress made in the last two decades, there is still much to learn from altimeter data for ocean variability studies. A lot of progress can be achieved, in particular, by improving the use of multiple altimeter data sets. In the past years, effective multi-satellite merging techniques have been developed both for global (e.g. Ducet et al., 2000, Brachet et al., 2003) and for regional (Pujol and Larnicol, 2006, Volkov et al, 2006) studies. We have now more than 20 years of altimeter data sets (1992-2012) and the merging activities will continue by taking into account the new altimeter missions (Altika, Sentinel3, Jason3/OSTM, etc..) which will carry on board new technologies allowing us to access to higher resolution. Moreover, the user needs have evolved in term of precision and resolution and new applications are emerging like the use of altimetry for coastal oceanography. The central purpose of this proposition is to elaborate improved merged altimetry products exploiting optimally the altimetry technologies to meet the user requirements, and quantify their contribution on the understanding of the ocean variability.