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• W569852707 abstract "C-band linear and polarimetric parameters derived from synthesis and decomposition of Radarsat-2 SAR data are analyzed and evaluated with respect to snow covers of variable thickness on smooth first year sea ice (SFYI). The study is conducted for two selected temperature conditions: 1) cold (− 7.9 °C) and 2) warm (− 0.4 °C). First, the polarimetric SAR response from the snow cover at cold conditions is analyzed with an objective to investigate the sensitivity of linear and polarimetric backscatter to snow thickness. Second, the changes in these sensitivities are examined as a function of change in surface air temperature (from − 7.9 °C to − 0.4 °C) through the changes manifested in snow geophysical properties. The dependence of linear and polarimetric backscatter response on radar incidence angle for different snow thicknesses is also evaluated. Our results demonstrate strong to weak relationships between the polarimetric parameters and snow thickness under cold conditions but virtually no relationship under warm conditions. The strength of this sensitivity varies with parameter type, radar incidence angle and snow geophysical properties. Under the cold conditions, fourteen polarimetric parameters demonstrate a positive relationship and nine demonstrate a negative relationship with snow thickness. This parameter sensitivity to snow thickness indicates an increase in volume or mixed scattering component with increase in snow thickness. The cause of this is primarily an increased microwave interaction with a greater number of dry snow grains, and/or more interaction with increased brine volumes in the brine-wetted snow and upper sea ice layer. A comparison of polarimetric signatures at warm conditions to that at cold conditions shows both an increase and a decrease in response for all snow thicknesses. For thin or medium snow cover, every time a polarimetric parameter response increases or decreases as a consequence of an increase in temperature there is always an opposite response in the same polarimetric parameter for thick snow cover. This is primarily due to the masking effect of moist-snow, likely caused by reduced penetration depth resulting in dominant surface scattering from the air/moist snow interface, and/or the dry snow–brine-wetted snow interface, as opposed to the snow–ice interface. Normal probability density functions (PDFs) employed to determine the snow thickness separation capability of polarimetric parameters show near overlapping signatures of all snow classes under warm conditions, suggesting that snow thickness estimation using snow thermodynamics at warm conditions is not possible." @default.
• W569852707 created "2016-06-24" @default.
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• W569852707 date "2015-09-01" @default.
• W569852707 modified "2023-09-25" @default.
• W569852707 title "Sensitivity of C-band synthetic aperture radar polarimetric parameters to snow thickness over landfast smooth first-year sea ice" @default.
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• W569852707 doi "https://doi.org/10.1016/j.rse.2015.06.005" @default.
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