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SSS retrieval from space: an comparison study using SMOS and Aquarius data

AutorGuimbard, Sébastien ; Gourrion, Jérôme ; Portabella, Marcos ; Ballabrera-Poy, Joaquim ; Turiel, Antonio ; Gabarró, Carolina ; González, Verónica ; Pérez, Fernando ; Martínez, Justino
Fecha de publicación7-may-2012
CitaciónThe 44th International Liège Colloquium on Ocean Dynamics (2012)
ResumenSince November 2nd, 2009 and June 10, 2011, two spatial missions give us the ability to measure sea surface salinity (SSS) from space. The Microwave Imaging Radiometer using Aperture Synthesis (MIRAS) instrument onboard the Soil Moisture and Ocean Salinity (SMOS) mission [Font et al. 2004] and a 3 feed horn radiometer onboard the Aquarius mission [Le Vine et al. 2007]. These two missions provide global coverage SSS products with different repetition rates, spatial resolutions and accuracies. The complexity of SMOS measurements, the amount of external contaminations at L-Band (sun, galaxy, ionosphere, radio frequency interferences...), the different SSS retrieval algorithms and auxiliary data sources used by SMOS and Aquarius, will certainly give non negligible differences in term of final SSS product. In order to be able to interpret these observed differences, different strategies can be investigated including spatio-temporal averaging technics. This kind of approach is investigated here on the sea surface brightness temperature rather than on the SSS in order to be able to have a consistent SSS retrieval algorithm and sea surface related auxiliary parameters between SMOS and Aquarius. A subset of SMOS sea surface brightness temperature in the same incidence angle configuration as Aquarius is first considered. An Aquarius and SMOS level 2 sea surface brightness temperature dataset for three incidence angles (i=1,2,3 =28.7◦, 37.8◦, 45.6◦) , spatially averaged in a regular grid of 1◦ ×1◦ and temporally averaged over a month, is built for the last 4 months of 2011. A new retrieval algorithm is developed and apply to this new product to get the SSS. This comparison study gives the opportunity to highlight possible instrumental biases and focus on possible issues regarding galactic and ionospheric signal corrections. Results with new auxiliary data sources like sea surface temperature (SST) or wind speed retrieved by other microwave satellites, which should be more accurate than NCEP or ECMWF model predictions, will be presented. The scatterometer on board Aquarius that give viable additional informations of the sea surface roughness contribution at L-band and the link between active/passive measurements will be investigated. As an example, a comparison of the sea surface roughness induced brightness temperature as seen by SMOS and Aquarius for different polarization states will be presented
DescripciónThe 44th International Liege Colloquium on Ocean Dynamics. Remote sensing of colour, temperature and salinity – new challenges and opportunities, 7-11 May 2012, Liège, University Campus
Versión del editorhttp://modb.oce.ulg.ac.be/?page=colloquium&year=2012
URIhttp://hdl.handle.net/10261/93977
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