DOI: 10.1002/jgrd.50626
论文题名: Parameterization of PAR vertical profile within horizontally uniform forest canopies for use in environmental modeling
作者: Lalic B. ; Firanj A. ; Mihailovic D.T. ; Podrascanin Z.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8156
结束页码: 8165
语种: 英语
英文关键词: horizontally uniform forest
; Lambert-Beer law relationship
; leaf area density
; photosynthetically active radiation
; radiation profile
Scopus关键词: Parameterization
; Absorption co-efficient
; Climate observations
; Environmental model
; horizontally uniform forest
; Lambert-Beer law
; Leaf area
; Photosynthetically active radiation
; Radiation transfer
; Forestry
; ecological modeling
; energy efficiency
; leaf area
; parameterization
; photosynthetically active radiation
; vertical profile
; Amazonas [Brazil]
; Brazil
; Ducke Reserve
; Jaru Biological Reserve
; Rondonia
英文摘要: The radiation transfer within the forest canopy plays crucial role in energy balance and turbulent transfer processes. Objective of this study is to suggest a new relation for vertical profile of photosynthetically active radiation (PAR) in case of horizontally uniform forest canopy. It is based on (i) the Lambert-Beer law relationship and (ii) new parameterization of leaf area density (LAD) profile. We have supposed that absorption coefficient μ varies with height and depends on LAD distribution. To check validity of the relation proposed, we have compared calculated values with the observations using data sets assimilated during Anglo-Brazilian Amazonian Climate Observation Study experiment at two observational sites located in Reserva Jaru and Reserva Ducke (Brazil) with different types of forest. Among all available measurements, 615 profiles observed between 08 and 18 local mean time for 72 days at 2 locations were selected. For comparison study, two more profiles based on constant- and variable-LAD approximation were introduced. Obtained results indicate that suggested relation: (i) well reproduces PAR profile within the forest in comparison with observations and (ii) shows better agreement with observations in comparison with two other profiles used in this study. Key Points New relation for PAR vertical profile within the horizontally uniform forest. Leaf area density profile is not constant with the canopy height. PAR profiles obtained with new parameterization give better results. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63474
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Faculty of Agriculture, Department for Field and Vegetable Crops, University of Novi Sad, Dositej Obradovic Sq. 8, 21000 Novi Sad, Serbia; Faculty of Sciences, Department of Physics, University of Novi Sad, Novi Sad, Serbia
Recommended Citation:
Lalic B.,Firanj A.,Mihailovic D.T.,et al. Parameterization of PAR vertical profile within horizontally uniform forest canopies for use in environmental modeling[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)