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Influence of ice thickness on SMOS and aquarius brightness temperatures over Antarctica
- Source :
- IGARSS, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), Digital.CSIC. Repositorio Institucional del CSIC, instname, Recercat. Dipósit de la Recerca de Catalunya
- Publication Year :
- 2015
- Publisher :
- IEEE, 2015.
-
Abstract
- 2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2015), Remote Sensing: Understanding the Earth for a Safer World, 26-31 July 2015, Milan, Italy.-- 4 pages, 6 figures, 1 table.-- © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.<br />The Dome-C region, in the East Antarctic Plateau, has been used for calibration/validation of satellite microwave radiometers since the 1970's. However, its use as an independent external target has been recently questioned due to some spatial inhomogeneities found in L-band airborne and satellite observations. This work evidences the influence of the Antarctic ice thickness spatial variations on the measured SMOS and Aquarius brightness temperatures (TB). The possible effects of subglacial water and bedrock on the acquired radiometric signals have also been analyzed. A 3-months no-daylight period during the Austral winter has been selected. Four transects over East Antarctica have been defined to study the spatial variations. A good agreement between SMOS and Aquarius TB changes and ice thickness variations over the whole Antarctica has been observed, obtaining linear correlations of 0.6-0.7 and slopes of 8.6-9.5 K/km. The subglacial lakes may affect the vertical physical temperature profile and/or the dielectric properties of the ice layers above. As expected, the subglacial bedrock is not contributing to the measured TB, since the maximum estimated L-band penetration depth is ~1-1.5 km
- Subjects :
- Brightness
geography
geography.geographical_feature_category
Radiometer
Ocean temperature
Bedrock
Radiometers
Enginyeria civil::Geologia::Oceanografia [Àrees temàtiques de la UPC]
Aquarius
Oceanografia
Glaciology
Sea surface temperature
Radiòmetres
Brightness temperature
Climatology
Subglacial bedrock
Antarctica
Satellite
Subglacial lakes
Transect
Ice thickness
Geology
L-band radiometer
SMOS
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- 2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
- Accession number :
- edsair.doi.dedup.....43b240e0e7c29f07f319abef4deb106f