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| Titel |
Measurements and modelling of snowmelt and turbulent heat fluxes over shrub tundra |
| VerfasserIn |
D. Bewley, R. Essery, J. Pomeroy, C. Ménard |
| 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. 7 ; Nr. 14, no. 7 (2010-07-26), S.1331-1340 |
| Datensatznummer |
250012373
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| Publikation (Nr.) |
 copernicus.org/hess-14-1331-2010.pdf |
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| Zusammenfassung |
| Measurements of snowmelt and turbulent heat fluxes were made during the
snowmelt periods of two years at two neighbouring tundra sites in the Yukon,
one in a sheltered location with tall shrubs exposed above deep snow and the
other in an exposed location with dwarf shrubs covered by shallow snow. The
snow was about twice as deep in the valley as on the plateau at the end of
each winter and melted out about 10 days later. The
site with buried vegetation showed a transition from air-to-surface heat
transfers to surface-to-air heat transfers as bare ground became exposed
during snowmelt, but there were daytime transfers of heat from the surface to
the air at the site with exposed vegetation even while snow remained on the
ground. A model calculating separate energy balances for snow and exposed
vegetation, driven with meteorological data from the sites, is found to be
able to reproduce these behaviours. Averaged over 30-day periods the model
gives about 8 Wm−2 more sensible heat flux to the atmosphere for the
valley site than for the plateau site. Sensitivity of simulated fluxes to
model parameters describing vegetation cover and density is investigated. |
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