期刊
HYDROLOGICAL PROCESSES
卷 26, 期 19, 页码 2951-2961出版社
WILEY-BLACKWELL
DOI: 10.1002/hyp.8329
关键词
GPS; snow; measurement technique; Niwot Ridge; GPS-IR; remote sensing
资金
- NSF [EAR 0948957]
- CU engineering college
- Fulbright/Capes
- NSF
- National Science Foundation
- National Center for Atmospheric Research
- Directorate For Geosciences [0922307] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [0948957] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0935725] Funding Source: National Science Foundation
- Division Of Earth Sciences [0922307] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1043051] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1027341] Funding Source: National Science Foundation
Snow is a critical storage component in the hydrologic cycle, but current measurement networks are sparse. In addition, the heterogeneity of snow requires surveying larger areas to measure the areal average. We presented snow measurements using GPS interferometric reflectometry (GPS-IR). GPS-IR measures a large area ( 100 m2), and existing GPS installations around the world have the potential to expand existing snow measurement networks. GPS-IR uses a standard, geodetic GPS installation to measure the snow surface via the reflected component of the signal. We reported GPS-IR snow depth measurements made at Niwot Ridge, Colorado, from October 2009 through June 2010. This site is in a topographic saddle at 3500 m elevation with a peak snow depth of 1.7 m near the GPS antenna. GPS-IR measurements are compared with biweekly snow surveys, a continuously operating scanning laser system and an airborne light detection and ranging (LIDAR) measurement. The GPS-IR measurement of peak snowpack (1.361.76 m) matches manual measurements (0.951.7 m) and the scanning laser (1.16 m). GPS-IR has RMS error of 13 cm (bias = 10 cm) compared with the laser, although differences between the measurement locations make comparison imprecise. Over the melt season, when the snowpack is more homogenous, the difference between the GPS-IR and the laser is reduced (RMS = 9 cm, bias = 6 cm). In other locations, the GPS and the LIDAR agree on which areas have more or less snow, but the GPS estimates more snow on the ground on tracks to the west (1.58 m) than the LIDAR (1.14 m). Copyright (C) 2011 John Wiley & Sons, Ltd.
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