Advanced melt indicators from passive microwave satellite observations in Antarctica
Liquid water has a significant impact on the microwave emissivity of the surface and, since decade, passive microwave observations are using to detect melt over ice sheet. However, the produced indicators are usually based on a single frequency and have different sensibilities. In the framework of t...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5017945 2023-10-01T03:52:10+02:00 Advanced melt indicators from passive microwave satellite observations in Antarctica Leduc-Leballeur, M. Picard, G. Macelloni, G. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017945 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1639 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017945 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1639 2023-09-03T23:42:30Z Liquid water has a significant impact on the microwave emissivity of the surface and, since decade, passive microwave observations are using to detect melt over ice sheet. However, the produced indicators are usually based on a single frequency and have different sensibilities. In the framework of the ESA 4D-Antarctica project, we propose to combine the binary melt indicators from the single-frequency to provide enhanced insights of the melt process. We focus on the 36 GHz and 19 GHz observations from the Advanced Microwave Scanning Radiometer 2 (AMSR2) satellite and the 1.4 GHz observations from the Soil Moisture and Ocean Salinity (SMOS) satellite. A deep theoretical analysis has been performed to explore the sensitivity of these frequencies to wet snow. In particular, 36 GHz distinguishes different stage of close surface melting and 1.4 GHz identifies the most intense period of melt during the summer. Moreover, AMSR2 provides observations in the afternoon (ascending pass) and in the night (descending pass) to detect the possible presence of a refrozen surface layer. The final classification is composed of nine melt status, which allows determining if a melt event was limited to the surface or if it was intense enough to inject significant water amounts at depths, and if refreezing happens during the night. This new product provides a clear and synthetic description of the melt status along the season. This opens a good opportunity for a potential use for the Copernicus Imaging Microwave Radiometer (CIMR) perspective. Conference Object Antarc* Antarctica Ice Sheet GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
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Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Liquid water has a significant impact on the microwave emissivity of the surface and, since decade, passive microwave observations are using to detect melt over ice sheet. However, the produced indicators are usually based on a single frequency and have different sensibilities. In the framework of the ESA 4D-Antarctica project, we propose to combine the binary melt indicators from the single-frequency to provide enhanced insights of the melt process. We focus on the 36 GHz and 19 GHz observations from the Advanced Microwave Scanning Radiometer 2 (AMSR2) satellite and the 1.4 GHz observations from the Soil Moisture and Ocean Salinity (SMOS) satellite. A deep theoretical analysis has been performed to explore the sensitivity of these frequencies to wet snow. In particular, 36 GHz distinguishes different stage of close surface melting and 1.4 GHz identifies the most intense period of melt during the summer. Moreover, AMSR2 provides observations in the afternoon (ascending pass) and in the night (descending pass) to detect the possible presence of a refrozen surface layer. The final classification is composed of nine melt status, which allows determining if a melt event was limited to the surface or if it was intense enough to inject significant water amounts at depths, and if refreezing happens during the night. This new product provides a clear and synthetic description of the melt status along the season. This opens a good opportunity for a potential use for the Copernicus Imaging Microwave Radiometer (CIMR) perspective. |
format |
Conference Object |
author |
Leduc-Leballeur, M. Picard, G. Macelloni, G. |
spellingShingle |
Leduc-Leballeur, M. Picard, G. Macelloni, G. Advanced melt indicators from passive microwave satellite observations in Antarctica |
author_facet |
Leduc-Leballeur, M. Picard, G. Macelloni, G. |
author_sort |
Leduc-Leballeur, M. |
title |
Advanced melt indicators from passive microwave satellite observations in Antarctica |
title_short |
Advanced melt indicators from passive microwave satellite observations in Antarctica |
title_full |
Advanced melt indicators from passive microwave satellite observations in Antarctica |
title_fullStr |
Advanced melt indicators from passive microwave satellite observations in Antarctica |
title_full_unstemmed |
Advanced melt indicators from passive microwave satellite observations in Antarctica |
title_sort |
advanced melt indicators from passive microwave satellite observations in antarctica |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017945 |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1639 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017945 |
op_doi |
https://doi.org/10.57757/IUGG23-1639 |
_version_ |
1778517871216820224 |