Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions
[Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAU International audience Knowledge of surface hydrology is essential for many applications, including studies that aim to understand permafrost response to changing climate and the associated feedback mechanisms. Advanced remote sensing techniques make it po...
Published in: | Remote Sensing |
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ftunivnantes:oai:HAL:hal-01140231v1 2023-05-15T15:18:37+02:00 Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions Incertitudes de mesure d'humidité des sols par micro-ondes actives : impact des variations saisonnières du coefficient de rétrodiffusion dans la tundra sibérienne Hoegstrom, E. Trofaier, A.M. Gouttevin, I. Bartsch, A. Vienna University of Technology (TU Wien) Hydrologie-Hydraulique (UR HHLY) Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) 2014 https://hal.archives-ouvertes.fr/hal-01140231 https://hal.archives-ouvertes.fr/hal-01140231/document https://hal.archives-ouvertes.fr/hal-01140231/file/ly2014-pub00043413.pdf https://doi.org/10.3390/rs6098718 en eng HAL CCSD MDPI info:eu-repo/semantics/altIdentifier/doi/10.3390/rs6098718 hal-01140231 https://hal.archives-ouvertes.fr/hal-01140231 https://hal.archives-ouvertes.fr/hal-01140231/document https://hal.archives-ouvertes.fr/hal-01140231/file/ly2014-pub00043413.pdf doi:10.3390/rs6098718 IRSTEA: PUB00043413 info:eu-repo/semantics/OpenAccess ISSN: 2072-4292 Remote Sensing https://hal.archives-ouvertes.fr/hal-01140231 Remote Sensing, 2014, 6 (9), pp.8718-8738. ⟨10.3390/rs6098718⟩ REMOTE SENSING HYDROLOGY STATISTICAL UNCERTAINTY HYDROLOGIE INCERTITUDE TELEDETECTION [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.3390/rs6098718 2022-12-07T02:38:28Z [Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAU International audience Knowledge of surface hydrology is essential for many applications, including studies that aim to understand permafrost response to changing climate and the associated feedback mechanisms. Advanced remote sensing techniques make it possible to retrieve a range of land-surface variables, including radar retrieved soil moisture (SSM). It has been pointed out before that soil moisture retrieval from satellite data can be challenging at high latitudes, which correspond to remote areas where ground data are scarce and the applicability of satellite data of this type is essential. This study investigates backscatter variability other than associated with changing soil moisture in order to examine the possible impact on soil moisture retrieval. It focuses on issues specific to SSM retrieval in the Arctic, notably variations related to tundra lakes. ENVISAT Advanced Synthetic Aperture Radar (ASAR) Wide Swath (WS, 120 m) data are used to understand and quantify impacts on Metop (AAdvanced Scatterometer (ASCAT, 25 km) soil moisture retrieval during the snow free period. Sites of interest are chosen according to ASAR WS availability, high or low agreement between output from the land surface model ORCHIDEE and ASCAT derived SSM. Backscatter variations are analyzed with respect to the ASCAT footprint area. It can be shown that the low model agreement is related to water fraction in most cases.No difference could be detected between periods with floating ice (in snow off situation) and ice free periods at the chosen sites. The mean footprint backscatter is however impacted by partial short term surface roughness change. The water fraction correlates with backscatter deviations (relative to a smooth water surface reference image) within the ASCAT footprint areas . Backscatter deviations of up to 5 dB can occur in areas with less than 50% water fraction and an assumed soil moisture related range (sensitivity) of 7 dB in the ASCAT data. The sensitivity is ... Article in Journal/Newspaper Arctic Ice permafrost Tundra Université de Nantes: HAL-UNIV-NANTES Arctic Asar ENVELOPE(134.033,134.033,68.667,68.667) Remote Sensing 6 9 8718 8738 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
REMOTE SENSING HYDROLOGY STATISTICAL UNCERTAINTY HYDROLOGIE INCERTITUDE TELEDETECTION [SDE]Environmental Sciences |
spellingShingle |
REMOTE SENSING HYDROLOGY STATISTICAL UNCERTAINTY HYDROLOGIE INCERTITUDE TELEDETECTION [SDE]Environmental Sciences Hoegstrom, E. Trofaier, A.M. Gouttevin, I. Bartsch, A. Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions |
topic_facet |
REMOTE SENSING HYDROLOGY STATISTICAL UNCERTAINTY HYDROLOGIE INCERTITUDE TELEDETECTION [SDE]Environmental Sciences |
description |
[Departement_IRSTEA]Eaux [TR1_IRSTEA]ARCEAU International audience Knowledge of surface hydrology is essential for many applications, including studies that aim to understand permafrost response to changing climate and the associated feedback mechanisms. Advanced remote sensing techniques make it possible to retrieve a range of land-surface variables, including radar retrieved soil moisture (SSM). It has been pointed out before that soil moisture retrieval from satellite data can be challenging at high latitudes, which correspond to remote areas where ground data are scarce and the applicability of satellite data of this type is essential. This study investigates backscatter variability other than associated with changing soil moisture in order to examine the possible impact on soil moisture retrieval. It focuses on issues specific to SSM retrieval in the Arctic, notably variations related to tundra lakes. ENVISAT Advanced Synthetic Aperture Radar (ASAR) Wide Swath (WS, 120 m) data are used to understand and quantify impacts on Metop (AAdvanced Scatterometer (ASCAT, 25 km) soil moisture retrieval during the snow free period. Sites of interest are chosen according to ASAR WS availability, high or low agreement between output from the land surface model ORCHIDEE and ASCAT derived SSM. Backscatter variations are analyzed with respect to the ASCAT footprint area. It can be shown that the low model agreement is related to water fraction in most cases.No difference could be detected between periods with floating ice (in snow off situation) and ice free periods at the chosen sites. The mean footprint backscatter is however impacted by partial short term surface roughness change. The water fraction correlates with backscatter deviations (relative to a smooth water surface reference image) within the ASCAT footprint areas . Backscatter deviations of up to 5 dB can occur in areas with less than 50% water fraction and an assumed soil moisture related range (sensitivity) of 7 dB in the ASCAT data. The sensitivity is ... |
author2 |
Vienna University of Technology (TU Wien) Hydrologie-Hydraulique (UR HHLY) Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) |
format |
Article in Journal/Newspaper |
author |
Hoegstrom, E. Trofaier, A.M. Gouttevin, I. Bartsch, A. |
author_facet |
Hoegstrom, E. Trofaier, A.M. Gouttevin, I. Bartsch, A. |
author_sort |
Hoegstrom, E. |
title |
Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions |
title_short |
Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions |
title_full |
Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions |
title_fullStr |
Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions |
title_full_unstemmed |
Assessing Seasonal Backscatter Variations with Respect toUncertainties in Soil Moisture Retrieval in SiberianTundra Regions |
title_sort |
assessing seasonal backscatter variations with respect touncertainties in soil moisture retrieval in siberiantundra regions |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-01140231 https://hal.archives-ouvertes.fr/hal-01140231/document https://hal.archives-ouvertes.fr/hal-01140231/file/ly2014-pub00043413.pdf https://doi.org/10.3390/rs6098718 |
long_lat |
ENVELOPE(134.033,134.033,68.667,68.667) |
geographic |
Arctic Asar |
geographic_facet |
Arctic Asar |
genre |
Arctic Ice permafrost Tundra |
genre_facet |
Arctic Ice permafrost Tundra |
op_source |
ISSN: 2072-4292 Remote Sensing https://hal.archives-ouvertes.fr/hal-01140231 Remote Sensing, 2014, 6 (9), pp.8718-8738. ⟨10.3390/rs6098718⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3390/rs6098718 hal-01140231 https://hal.archives-ouvertes.fr/hal-01140231 https://hal.archives-ouvertes.fr/hal-01140231/document https://hal.archives-ouvertes.fr/hal-01140231/file/ly2014-pub00043413.pdf doi:10.3390/rs6098718 IRSTEA: PUB00043413 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3390/rs6098718 |
container_title |
Remote Sensing |
container_volume |
6 |
container_issue |
9 |
container_start_page |
8718 |
op_container_end_page |
8738 |
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