SMOS Validation Rehearsal Campaign Workshop, 18-19/11/2008, Noordwijkerhout, The Netherlands SMOS Validation Rehearsal Campaign Mediterranean flights C. Gabarró, M. Talone, J. Font SMOS Barcelona Expert Centre Pg. Marítim de la Barceloneta 37-49, Barcelona (Spain) E-mail: [email protected]URL: www.smos-bec.icm.csic.es
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SMOS Validation Rehearsal Campaign Workshop, 18-19/11/2008, Noordwijkerhout, The Netherlands SMOS Validation Rehearsal Campaign Mediterranean flights C.
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SMOS Validation Rehearsal Campaign Workshop, 18-19/11/2008, Noordwijkerhout, The Netherlands
• Klein & Swift for the sea water dielectric constant• Linear fit of Hollinger Measurements for Wind Effect • Linear approximation for the Atmospheric Contribution
• Assuming Apparent Temperature = Brightness Temperature
KT
Temphh
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T
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sky
surf
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Ulaby F., Moore R., Fung A. - Microwave Remote Sensing Active and Passive - ed. Addison-Wesley Publishing Company
HUT-2D Data Processing
SMOS Rehearsal Campaign 26
In-situ (vessel measured) SSS
Nearest neighbour approximationalong the ground-track for SSS and SST
Nearest neighbour (in time and space) QuikSCAT data for Wind Speed [KNMI]
3.73 m/s 13/08/2007 at 17.583.46 m/s 15/08/2007 at 17.06
Direct measurements
In-situ (vessel measured) SST
Direct measurements
SMOS Rehearsal Campaign 27
Apparent Temperature at X-Pol
Apparent Temperature at Y-Pol
Second flight on August, 13
SMOS Rehearsal Campaign 28
Difference between Apparent Temperature and Modeled Brightness Temperature in the Earth reference frame
The antenna pattern must be included in the processing to transform the apparent temperature in measured brightness temperature!
Kainulainen, J., Rautiainen, K., Hallikainen, M., Takala, M - Radiometric performance of interferometric synthetic aperture radiometer HUT-2D IEEE International Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007.
SMOS Rehearsal Campaign 29
In order to make the SSS retrieval possible and reliable:
• Antenna pattern must be considered
• A previous selection of the measurements must be performed
• Better models for atmospheric and galactic contribution must be used
SMOS Barcelona Expert Centre (SMOS-BEC)Pg. Marítim de la Barceloneta 37-49, E-08003 Barcelona, SPAINTel. (+34) 93 230 95 00; Fax. (+34) 93 230 95 55URL: www.smos-bec.icm.csic.es