Abstract
In this paper the surface energy balance of forests is considered on a regional scale. The interaction between the surface fluxes of sensible and latent heat on the one hand and the temperature (and humidity) of the planetary boundary layer (PBL) on the other is accounted for, as are entrainment processes at the top of the PBL. For this purpose, the one-dimensional PBL model of Troen & Mahrt is coupled to the simple ‘single-leaf’ vegetation model of Penman-Monteith. The surface conductance is described in accordance with Stewart, whereas the aerodynamic conductance is corrected for stability. The integrated model applies in stable, unstable and neutral conditions. Two forest types (‘Thetford’ and ‘Les Landes’) are modelled, and compared with grass and bare soil. In summertime, calculated temperature, saturation deficit and depth of the PBL are greater over forest than over grass. The entrainment of warm, dry air at the top of the PBL appears to be important. It supplies the energy to maintain the evaporation of wet forest higher than net radiation. Well-known features, such as low transpiration and high evaporation rates (compared with grass) when the canopy is dry and wet respectively, are described correctly.
Subject
Industrial and Manufacturing Engineering,General Agricultural and Biological Sciences,General Business, Management and Accounting,Materials Science (miscellaneous),Business and International Management
Reference23 articles.
1. Catchment-scale evaporation and the atmospheric boundary layer
2. A model for the Priestley-Taylor parameter a. J. Climate appl;De Bruin H. A. R.;Met.,1983
3. Zero-plane displacement and roughness length for tall vegetation, derived from a simple mass conservation hypothesis
4. Predicting forest transpiration from climatological data
5. Driedonks A. G. M. 1981 Dynamics of the well-mixed atmospheric boundary layer. Scientific report W.R. 81-2. (189 pages.) De Bilt: Royal Netherlands Meteorological Institute.
Cited by
18 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献