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| Titel |
Evaluation of alternative formulae for calculation of surface temperature in snowmelt models using frequency analysis of temperature observations |
| VerfasserIn |
C. H. Luce, D. G. Tarboton |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 3 ; Nr. 14, no. 3 (2010-03-18), S.535-543 |
| Datensatznummer |
250012227
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| Publikation (Nr.) |
 copernicus.org/hess-14-535-2010.pdf |
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| Zusammenfassung |
| The snow surface temperature is an important quantity in the snow energy
balance, since it modulates the exchange of energy between the surface and
the atmosphere as well as the conduction of energy into the snowpack. It is
therefore important to correctly model snow surface temperatures in energy
balance snowmelt models. This paper focuses on the relationship between snow
surface temperature and conductive energy fluxes that drive the energy
balance of a snowpack. Time series of snow temperature at the surface and
through the snowpack were measured to examine energy conduction in a
snowpack. Based on these measurements we calculated the snowpack energy
content and conductive energy flux at the snow surface. We then used these
estimates of conductive energy flux to evaluate formulae for the calculation
of the conductive flux at the snow surface based on surface temperature time
series. We use a method based on Fourier frequency analysis to estimate snow
thermal properties. Among the formulae evaluated, we found that a modified
force-restore formula, based on the superimposition of the force-restore
equation capturing diurnal fluctuations on a gradually changing temperature
gradient, had the best agreement with observations of heat conduction. This
formula is suggested for the parameterization of snow surface temperature in
a full snowpack energy balance model. |
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