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Spatio-temporal snowmelt variability across the headwaters of the Southern Rocky Mountains |
S.R. FASSNACHT1,2,3,4,5(), J.I. LÓPEZ-MORENO6, C. MA1, A.N. WEBER1, A.K.D. PFOHL7, S.K. KAMPF1,4, M. KAPPAS5 |
1. ESS-Watershed Science, Colorado State University, Fort Collins, CO 80523-1476, USA 2. Cooperative Institute for Research in the Atmosphere, Fort Collins, CO 80523-1375, USA 3. Geospatial Centroid at CSU, Fort Collins, CO 80523-1019, USA 4. Natural Resources Ecology Laboratory, Fort Collins, CO 80523-1499, USA 5. Geographisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany 6. Instituto Pirenaico de Ecología, CSIC, Campus de Aula Dei, 50080 Zaragoza, Spain 7. EASC-Watershed Science, Colorado State University, Fort Collins, CO 80523-1482, USA |
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Abstract Understanding the rate of snowmelt helps inform how water stored as snow will transform into streamflow. Data from 87 snow telemetry (SNOTEL) stations across the Southern Rocky Mountains were used to estimate spatio-temporal melt factors. Decreases in snow water equivalent were correlated to temperature at these monitoring stations for eight half-month periods from early March through late June. Time explained 70% of the variance in the computed snow melt factors. A residual linear correlation model was used to explain subsequent spatial variability. Longitude, slope, and land cover type explained further variance. For evergreen trees, canopy density was relevant to find enhanced melt rates; while for all other land cover types, denoted as non-evergreen, lower melt rates were found at high elevation, high latitude and north facing slopes, denoting that in cold environments melting is less effective than in milder sites. A change in the temperature sensor about mid-way through the time series (1990 to 2013) created a discontinuity in the temperature dataset. An adjustment to the time series yield larger computed melt factors.
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Keywords
melt
SWE
temperature
SNOTEL
temperature sensor change
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Corresponding Author(s):
S.R. FASSNACHT
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Just Accepted Date: 28 February 2017
Online First Date: 21 March 2017
Issue Date: 12 July 2017
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