Ice thickness effects on Aquarius brightness temperatures over Antarctica
The Dome-C region, in the East Antarctic Plateau, is regarded as an ideal natural laboratory for calibration/validation of space-borne microwave radiometers. At L-band, the thermal stability of this region has been confirmed by several experimental campaigns. However, its use as an independent exter...
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Online Access: | http://hdl.handle.net/2117/81149 https://doi.org/10.1002/2014JC010151 |
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ftupcatalunyair:oai:upcommons.upc.edu:2117/81149 2024-09-15T17:46:21+00:00 Ice thickness effects on Aquarius brightness temperatures over Antarctica Pablos Hernández, Miriam Piles Guillem, Maria Gonzalez Gambau, Verónica Camps Carmona, Adriano José Vall-Llossera Ferran, Mercedes Magdalena Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions Universitat Politècnica de Catalunya. CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció 2015-04-01 13 p. application/pdf http://hdl.handle.net/2117/81149 https://doi.org/10.1002/2014JC010151 eng eng Pablos, M., Piles, M., Gonzalez, V., Camps, A., Vall-llossera, M. Ice thickness effects on Aquarius brightness temperatures over Antarctica. "Journal of geophysical research-oceans", 01 Abril 2015, vol. 120, núm. 4, p. 2856-2868. 2169-9275 http://hdl.handle.net/2117/81149 doi:10.1002/2014JC010151 Open Access East Antarctica (Antarctica) Antarctica--Research Brightness temperature--Measurement Ice Radiation--Measurement Aquarius Brightness temperature Ice thickness L-band radiometer Dielectric-properties Microwave Permitivity Calibration Radiometers Frequencies Surface SMOS Site Antàrtida Glaç Radiació -- Mesurament Article 2015 ftupcatalunyair https://doi.org/10.1002/2014JC010151 2024-07-25T11:12:00Z The Dome-C region, in the East Antarctic Plateau, is regarded as an ideal natural laboratory for calibration/validation of space-borne microwave radiometers. At L-band, the thermal stability of this region has been confirmed by several experimental campaigns. However, its use as an independent external calibration target has recently been questioned due to some spatial inhomogeneities and seasonal effects revealed in the brightness temperatures (T-B) acquired in this area. This paper shows the observed relationship, from exploratory research, between the Antarctic ice thickness spatial variations and the measured Aquarius T-B changes. A 3-months no-daylight period during the Austral winter has been analyzed. Four transects have been defined over East Antarctica covering areas with different ice thickness variations and ranges. The theoretical L-band penetration depth has been estimated to understand the possible contributions to the measured signal. A good agreement has been observed between Aquarius T-B and ice thickness variations over the whole Antarctica, with correlations of approximate to 0.6-0.7. The two variables show a linear trend with slopes of approximate to 8.3-9.5 K/km. No correlation has been observed with the subglacial bedrock. The maximum L-band penetration depth has been estimated to be approximate to 1-1.5 km. Results are therefore consistent: the spatial variations found on Aquarius T-B are not related to the emissivity of the bedrock, which lies deeper. This study provides evidence that new L-band satellite observations could contribute to further our understanding of Antarctic geophysical processes. Peer Reviewed Postprint (published version) Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge Journal of Geophysical Research: Oceans 120 4 2856 2868 |
institution |
Open Polar |
collection |
Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge |
op_collection_id |
ftupcatalunyair |
language |
English |
topic |
East Antarctica (Antarctica) Antarctica--Research Brightness temperature--Measurement Ice Radiation--Measurement Aquarius Brightness temperature Ice thickness L-band radiometer Dielectric-properties Microwave Permitivity Calibration Radiometers Frequencies Surface SMOS Site Antàrtida Glaç Radiació -- Mesurament |
spellingShingle |
East Antarctica (Antarctica) Antarctica--Research Brightness temperature--Measurement Ice Radiation--Measurement Aquarius Brightness temperature Ice thickness L-band radiometer Dielectric-properties Microwave Permitivity Calibration Radiometers Frequencies Surface SMOS Site Antàrtida Glaç Radiació -- Mesurament Pablos Hernández, Miriam Piles Guillem, Maria Gonzalez Gambau, Verónica Camps Carmona, Adriano José Vall-Llossera Ferran, Mercedes Magdalena Ice thickness effects on Aquarius brightness temperatures over Antarctica |
topic_facet |
East Antarctica (Antarctica) Antarctica--Research Brightness temperature--Measurement Ice Radiation--Measurement Aquarius Brightness temperature Ice thickness L-band radiometer Dielectric-properties Microwave Permitivity Calibration Radiometers Frequencies Surface SMOS Site Antàrtida Glaç Radiació -- Mesurament |
description |
The Dome-C region, in the East Antarctic Plateau, is regarded as an ideal natural laboratory for calibration/validation of space-borne microwave radiometers. At L-band, the thermal stability of this region has been confirmed by several experimental campaigns. However, its use as an independent external calibration target has recently been questioned due to some spatial inhomogeneities and seasonal effects revealed in the brightness temperatures (T-B) acquired in this area. This paper shows the observed relationship, from exploratory research, between the Antarctic ice thickness spatial variations and the measured Aquarius T-B changes. A 3-months no-daylight period during the Austral winter has been analyzed. Four transects have been defined over East Antarctica covering areas with different ice thickness variations and ranges. The theoretical L-band penetration depth has been estimated to understand the possible contributions to the measured signal. A good agreement has been observed between Aquarius T-B and ice thickness variations over the whole Antarctica, with correlations of approximate to 0.6-0.7. The two variables show a linear trend with slopes of approximate to 8.3-9.5 K/km. No correlation has been observed with the subglacial bedrock. The maximum L-band penetration depth has been estimated to be approximate to 1-1.5 km. Results are therefore consistent: the spatial variations found on Aquarius T-B are not related to the emissivity of the bedrock, which lies deeper. This study provides evidence that new L-band satellite observations could contribute to further our understanding of Antarctic geophysical processes. Peer Reviewed Postprint (published version) |
author2 |
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions Universitat Politècnica de Catalunya. CTE-CRAE - Grup de Recerca en Ciències i Tecnologies de l'Espai Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció |
format |
Article in Journal/Newspaper |
author |
Pablos Hernández, Miriam Piles Guillem, Maria Gonzalez Gambau, Verónica Camps Carmona, Adriano José Vall-Llossera Ferran, Mercedes Magdalena |
author_facet |
Pablos Hernández, Miriam Piles Guillem, Maria Gonzalez Gambau, Verónica Camps Carmona, Adriano José Vall-Llossera Ferran, Mercedes Magdalena |
author_sort |
Pablos Hernández, Miriam |
title |
Ice thickness effects on Aquarius brightness temperatures over Antarctica |
title_short |
Ice thickness effects on Aquarius brightness temperatures over Antarctica |
title_full |
Ice thickness effects on Aquarius brightness temperatures over Antarctica |
title_fullStr |
Ice thickness effects on Aquarius brightness temperatures over Antarctica |
title_full_unstemmed |
Ice thickness effects on Aquarius brightness temperatures over Antarctica |
title_sort |
ice thickness effects on aquarius brightness temperatures over antarctica |
publishDate |
2015 |
url |
http://hdl.handle.net/2117/81149 https://doi.org/10.1002/2014JC010151 |
genre |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica |
op_relation |
Pablos, M., Piles, M., Gonzalez, V., Camps, A., Vall-llossera, M. Ice thickness effects on Aquarius brightness temperatures over Antarctica. "Journal of geophysical research-oceans", 01 Abril 2015, vol. 120, núm. 4, p. 2856-2868. 2169-9275 http://hdl.handle.net/2117/81149 doi:10.1002/2014JC010151 |
op_rights |
Open Access |
op_doi |
https://doi.org/10.1002/2014JC010151 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
120 |
container_issue |
4 |
container_start_page |
2856 |
op_container_end_page |
2868 |
_version_ |
1810494397100326912 |