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Forward simulations of radar backscatter and brightness temperature from lake ice, and comparison with measurements from satellite altimetry missions

Urheber*innen

Duguay,  Claude
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Murfitt,  Justin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Picard,  Ghislain
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zakharova,  Elena
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Restano,  Marco
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Benveniste,  Jérôme
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Duguay, C., Murfitt, J., Picard, G., Zakharova, E., Restano, M., Benveniste, J. (2023): Forward simulations of radar backscatter and brightness temperature from lake ice, and comparison with measurements from satellite altimetry missions, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3916


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020631
Zusammenfassung
Lake ice thickness (LIT) and lake water level (LWL) are two thematic products of lakes as an Essential Climate Variable (ECV). Lake water levels are routinely estimated using radar measurements from satellite altimetry missions, but the retrieval of LIT from such missions is relatively new. While there is growing interest in the production of climate data records of LIT through the processing of historical time series, there is a need to examine the impact of varying ice and overlying snow properties on radar altimetry and microwave radiometry measurements through full ice seasons. There is also recent realization that the presence of ice cover on lakes has an impact on the quality of LWL estimates for several weeks/months of the year. Thin ice during initial ice formation, the absence of snow on the ice surface, the presence of deformation features (i.e. cracks in the ice and pressure ridges), and snow/ice melt onset introduce uncertainty in the retrieval of LIT and LWL from state-of-the-art algorithms.This talk will present results from a study that examined the sensitivity of radar backscatter and microwave brightness temperature measurements from satellite altimetry missions to varying snow and ice properties on large northern lakes. The presentation will cover results from: 1) forward modelling experiments of brightness temperature (18-37 GHz) and backscatter/waveforms (3-36 GHz) using the Snow Microwave Radiative Transfer (SMRT) model linked to a thermodynamic lake ice model; and 2) the comparison of forward simulations of radar backscatter and brightness temperature with measurements from Sentinel-3 and Jason-3 missions.