Modelling evaporation from a high subarctic willow‐birch forest
Abstract Continuous measurements of the energy balance were made during the 1991 growing season over a dwarf willow‐birch forest located near Churchill, Manitoba. Intensive measurements of stomatal conductance for several species were taken on three fair‐weather days. These represented a wide range...
| Published in: | International Journal of Climatology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1995
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/joc.3370150110 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3370150110 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3370150110 |
| Summary: | Abstract Continuous measurements of the energy balance were made during the 1991 growing season over a dwarf willow‐birch forest located near Churchill, Manitoba. Intensive measurements of stomatal conductance for several species were taken on three fair‐weather days. These represented a wide range of air temperatures and leaf‐to‐air vapour pressure deficits and allowed the quantification of the surface‐atmosphere interaction. Modelling evaporation on a 0‐5 h basis can be performed accurately using a modified version of the Penman‐Monteith combination model coupled to a submodel of stomatal conductance. With a vegetated surface cover of about 90 per cent at full leafing, vegetation plays an important role in the overall moisture flux because 80 per cent is a result of transpiration. Simulating various vegetation‐change scenarios shows that species composition, through differences in stomatal behaviour, has a marked effect on evaporation. |
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