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June 2003. All variables, except for snow depth, were recorded at 30-s intervals and averaged to 10-min values. Snow depth was recorded as a single sample value at the start of each 10-min period. Data were recorded on Campbell CR10X dataloggers using manufacturer-supplied calibration sensitivities for each instrument where appropriate. 2) Snowpit data Snowpit measurements were made at CLPX meteorological sites as close as possible to the footprint of the acoustic depth sounder without disturbing
June 2003. All variables, except for snow depth, were recorded at 30-s intervals and averaged to 10-min values. Snow depth was recorded as a single sample value at the start of each 10-min period. Data were recorded on Campbell CR10X dataloggers using manufacturer-supplied calibration sensitivities for each instrument where appropriate. 2) Snowpit data Snowpit measurements were made at CLPX meteorological sites as close as possible to the footprint of the acoustic depth sounder without disturbing
September 2001 for 23 flight lines in the Fraser MSA, 84 flight lines in the North Park MSA, and 22 flight lines in the Rabbit Ears MSA. Coincident ground observations of gravimetric soil moisture were collected to estimate the mean soil moisture along each flight line. This was used to calibrate the background radiation measurements, accounting for the attenuation effects of existing soil moisture. The absorption and reradiation of gamma radiation by intervening vegetation mass was also accounted for
September 2001 for 23 flight lines in the Fraser MSA, 84 flight lines in the North Park MSA, and 22 flight lines in the Rabbit Ears MSA. Coincident ground observations of gravimetric soil moisture were collected to estimate the mean soil moisture along each flight line. This was used to calibrate the background radiation measurements, accounting for the attenuation effects of existing soil moisture. The absorption and reradiation of gamma radiation by intervening vegetation mass was also accounted for
solar radiation because of slope effects. The new albedos are much higher than the old ones for both models, although SNTHERM’s albedos tend to be higher than FASST’s and they also exhibit more variation. The calculated reflected solar radiation I s ↑ is shown in Fig. 11c for days 82–95. The line shows the 1:1 fit between the two models and the observations. As with the albedo, the offset of the original model reflected solar radiation is different than the measurements because of slope
solar radiation because of slope effects. The new albedos are much higher than the old ones for both models, although SNTHERM’s albedos tend to be higher than FASST’s and they also exhibit more variation. The calculated reflected solar radiation I s ↑ is shown in Fig. 11c for days 82–95. The line shows the 1:1 fit between the two models and the observations. As with the albedo, the offset of the original model reflected solar radiation is different than the measurements because of slope
