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Where κe is the forest vegetation extinction coefficient, and SV the forest stem volume (biomass). Based on an airborne survey, Cohen et al. (2015) determined κe for 10.65, 18.7 and 36.5 GHz; Figure 2 shows the obtained model fits to observed airborne brightness temperatures, as well as comparisons to transmissivity models by Kruopis et al. (1999) and Langlois et al. (2011). The model by Kruopis et al. (1999) applied in GlobSnow products (1.0 and 2.0); had a distinct problem of the model is saturation for even model stem volumes (50 m3 ha-1 at 18.7 GHz and 100 m3 ha-1 at 36.5 GHz), which contradicts observational data. In fact, the earlier GlobSnow products applied a constant stem volume of 80 m3 ha-1 for the entire Northern Hemisphere, due to lack of a reliable stem volume dataset at the time of development of those products.
Snow Water Equivalent (SWE) version 1.0: Algorithm Theoretical Basis Document (ATBD)#Eq. Eq. 3 and the derived extinction coefficients of κe= 0.007 at 18.7 GHz and κe= 0.011 at 36.5 GHz (for V-polarization) derived by Cohen et al. (2015) are applied to replace the transmissivity model by Kruopis et al. (1999). The ESA BIOMASAR (Santoro et al., 2011; Santoro et al., 2015) stem volume estimates are applied to calculate spatially variable transmissivity, replacing the constant stem volume applied in earlier versions.
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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Snow Water Equivalent (SWE) version 1.0: Algorithm Theoretical Basis Document (ATBD)
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