Barcelona Expert Center on Radiometric Calibration and Ocean Salinity

Barcelona, Spain

Barcelona Expert Center on Radiometric Calibration and Ocean Salinity

Barcelona, Spain

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Sabia R.,Polytechnic University of Catalonia | Sabia R.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | Camps A.,Polytechnic University of Catalonia | Camps A.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | And 6 more authors.
IEEE Transactions on Geoscience and Remote Sensing | Year: 2010

The Soil Moisture and Ocean Salinity mission will provide sea surface salinity maps over the oceans, beginning in late 2009. In this paper an ocean salinity error budget is described, an analysis needed to identify the magnitude of the error sources associated with the retrieval. Instrumental, external noise sources, and geophysical errors have been analyzed, stressing their relative impact. This paper includes results from previous studies, addressing the impact of multisource auxiliary sea surface temperature and wind speed data on the final salinity error. It provides, moreover, a sensitivity analysis to the uncertainty of the auxiliary salinity field. Salinity retrieval has been addressed in a wide set of configurations of the inversion algorithm. © 2009 IEEE.


Gabarro C.,CSIC - Institute of Marine Sciences | Gabarro C.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | Gonzalez-Gambau V.,CSIC - Institute of Marine Sciences | Gonzalez-Gambau V.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | And 11 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2012

The Local Oscillators (LO) of the Microwave Imaging Radiometer using Aperture Synthesis (MIRAS) onboard the Soil Moisture and Ocean Salinity (SMOS) satellite are used to maintain the operating frequency of the 69 receivers. The phase of the LO drifts over time, in turn blurring the MIRAS brightness temperature (TB) measurements. After a pre-launch assessment, it was decided to calibrate the LO every 10 minutes to reduce the phase drifts. During short periods of the first 2.5 years of SMOS mission, the LO calibration has been performed every 2 minutes to assess the impact of a higher calibration frequency on the quality of the data. In this study, relative differences (10-min TBs versus 2-min TBs) of about 0.3 K are shown, which lead to non-negligible relative differences of about 0.2-0.3 practical salinity units (psu) in the retrieved sea surface salinity (SSS). However, when performing independent validation against Argo float SSS data at Level 3 (spatio-temporally averaged SSS products), no significant differences are found between 10-min and 2-min data. This is due to the fact that current SMOS SSS accuracy (relative to Argo) is about 0.6-0.8 psu, thus masking the relatively smaller LO calibration frequency effect. © 2012 IEEE.


Gourrion J.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | Gourrion J.,CSIC - Institute of Marine Sciences | Ballabrera J.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | Aretxabaleta A.L.,Barcelona Expert Center on Radiometric Calibration and Ocean Salinity | And 8 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2010

With the advent of ESA's SMOS Mission, we have the opportunity for the first time of measuring Sea Surface Salinity (SSS) from the space and at a synoptic scale. However, the MIRAS instrument onboard SMOS is a new concept of instrument, and the adjustment and calibration of this interferometric radiometer poses great challenges. In this paper, we show the present status of Level 3 and 4 salinity maps, which are supposed to give accurate climatological descriptions of SSS, describing the attained accuracy and analyzing the geophysical consistence of those maps. A discussion on future improvements is also issued. © 2010 IEEE.

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