Detecting Rain–Snow-Transition Elevations in Mountain Basins Using Wireless Sensor Networks

To provide complementary information on the hydrologically important rain–snow-transition elevation in mountain basins, this study provides two estimation methods using ground measurements from basin-scale wireless sensor networks: one based on wet-bulb temperature T wet and the other based on snow-...

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Vydané v:Journal of hydrometeorology Ročník 21; číslo 9; s. 2061 - 2081
Hlavní autori: Cui, Guotao, Bales, Roger, Rice, Robert, Anderson, Michael, Avanzi, Francesco, Hartsough, Peter, Conklin, Martha
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States American Meteorological Society 01.09.2020
Predmet:
ENVIRONMENTAL SCIENCES
Hydrology
Instrumentation/sensors
Measurements
Mountain meteorology
Operational forecasting
Radar observations
Radars
ISSN:1525-755X, 1525-7541
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Popis
Shrnutí:To provide complementary information on the hydrologically important rain–snow-transition elevation in mountain basins, this study provides two estimation methods using ground measurements from basin-scale wireless sensor networks: one based on wet-bulb temperature T wet and the other based on snow-depth measurements of accumulation and ablation. With data from 17 spatially distributed clusters (178 nodes) from two networks, in the American and Feather River basins of California’s Sierra Nevada, we analyzed transition elevation during 76 storm events in 2014–18. A T wet threshold of 0.5°C best matched the transition elevation defined by snow depth. Transition elevations using T wet in upper elevations of the basins generally agreed with atmospheric snow level from radars located at lower elevations, while radar snow level was ~100m higher due to snow-level lowering on windward mountainsides during orographic lifting. Diurnal patterns of the difference between transition elevation and radar snow level were observed in the American basin, related to diurnal ground-temperature variations. However, these patterns were not found in the Feather basin due to complex terrain and higher uncertainties in transition-elevation estimates. The American basin tends to exhibit 100-m-higher transition elevations than does the Feather basin, consistent with the Feather basin being about 1° latitude farther north. Transition elevation averaged 155m higher in intense atmospheric river events than in other events; meanwhile, snow-level lowering was enhanced with a 90-m-larger difference between radar snow level and transition elevation. On-the-ground continuous observations from distributed sensor networks can complement radar data and provide important ground truth and spatially resolved information on transition elevations in mountain basins.
Bibliografia:USDOE
AC02-05CH11231
ISSN:1525-755X
1525-7541
DOI:10.1175/JHM-D-20-0028.1