期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 149, 期 5, 页码 851-861出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2008.11.003
关键词
Surface resistance; Peat; Evapotranspiration; Tundra fen; Land-surface scheme; Wetland
资金
- ArcticNet
- Network of Centres of Excellence
- NSERC Discovery Grant
- Manitoba Hydro's Research and Development Program
- Northern Science and Training Program
- Northern Research Fund
- Churchill Northern Studies Centre
Eddy covariance measurements of evapotranspiration at a wetland tundra sedge fen near Churchill, Manitoba, Canada, from 15 June to 21 August, 2007, were used to calculate hourly resistance values for the peat component of the fen's surface. Inherent in the calculations were the assumptions that evaporation from the open water and transpiration from the living sedge components of the fen's surface, as well as the aerodynamic resistance, could be reasonably well modeled. Fitting a curve to these results provided a regression model for the daytime variation of the hourly surface resistance to evaporation from the peat. It was concluded that the surface resistance, which was relatively low during the morning hours and increased during the afternoon hours, reflected, in part, a diurnal wetting and drying of the near surface layer. This insight into the daytime variation of resistance to evaporation from the peat surface of a wetland tundra sedge fen may be of assistance in the formulation of land-surface schemes. (C) 2008 Elsevier B.V. All rights reserved.
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