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Impact of the Local Oscillator calibration on the SMOS sea surface Salinity maps

AutorGabarró, Carolina ; González, Verónica ; Martínez, Justino ; Guimbard, Sébastien ; Gourrion, Jérôme ; Piles, María ; Portabella, Marcos ; Font, Jordi
Fecha de publicación2012
EditorInstitute of Electrical and Electronics Engineers
CitaciónGeoscience and Remote Sensing Symposium (IGARSS): 2613-2616 (2012)
ResumenThe 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
DescripciónIEEE International Geoscience and Remote Sensing Symposium (IGARSS): Remote Sensing for a Dynamic Earth, 22-27 July 2012, Munich, Germany
Versión del editorhttp://dx.doi.org/10.1109/IGARSS.2012.6350940
Identificadoresdoi: 10.1109/IGARSS.2012.6350940
isbn: 978-1-4673-1160-1
issn: 2153-6996
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