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Computation of a new Mean Dynamic Topography for the Mediterranean Sea from model outputs, altimeter measurements and oceanographic in-situ data

AuthorsRio, Marie Hélène; Pascual, Ananda ; Poulain, Pierre-Marie; Menna, Milena; Barceló-Llull, Bàrbara ; Tintoré, Joaquín
Issue Date20-Feb-2014
PublisherCopernicus Publications
CitationOcean Science Discussions 11: 655-692 (2014)
AbstractThe accurate knowledge of the ocean Mean Dynamic Topography (MDT) is a crucial issue for a number of oceanographic applications and in some areas of the Mediterranean Sea, important limitations have been found pointing to the need of an upgrade. We present a new Mean Dynamic Topography (MDT) that was computed for the Mediterranean Sea. It takes profit of improvements made possible by the use of extended datasets and refined processing. The updated dataset spans the 1993–2012 period and consists of: drifter velocities, altimetry data, hydrological profiles and model data. The methodology is similar to the previous MDT Rio et al. (2007). However, in Rio et al. (2007) no hydrological profiles had been taken into account. This has required the development of dedicated processing. A number of sensitivity studies have been carried out to obtain the most accurate MDT as possible. The main results from these sensitivity studies are the following: moderate impact to the choice of correlation scales but almost negligible sensitivity to the choice of the first guess (model solution). A systematic external validation to independent data has been made to evaluate the performance of the new MDT. Compared to previous version, SMDT-MED-2014 features shorter scales structures, which results in an altimeter velocity variance closer to the observed velocity variance and, at the same time, gives better Taylor skills.
Publisher version (URL)http://dx.doi.org/10.5194/osd-11-655-2014
Identifiersdoi: 10.5194/osd-11-655-2014
issn: 1812-0822
Appears in Collections:(IMEDEA) Artículos
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