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Parameterisation of aerodynamic roughness over boreal, cool- and warm-temperate forests

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Title: Parameterisation of aerodynamic roughness over boreal, cool- and warm-temperate forests
Authors: Nakai, Taro Browse this author
Sumida, Akihiro Browse this author →KAKEN DB
Daikoku, Ken'ichi Browse this author
Matsumoto, Kazuho Browse this author
van der Molen, Michiel K. Browse this author
Kodama, Yuji Browse this author →KAKEN DB
Kononov, Alexander V. Browse this author
Maximov, Trofim C. Browse this author
Dolman, Albertus J. Browse this author
Yabuki, Hironori Browse this author
Hara, Toshihiko Browse this author
Ohta, Takeshi Browse this author
Keywords: roughness length
zero-plane displacement
stand density
leaf area index
Issue Date: 8-Dec-2008
Publisher: Elsevier
Journal Title: Agricultural and Forest Meteorology
Volume: 148
Issue: 12
Start Page: 1916
End Page: 1925
Publisher DOI: 10.1016/j.agrformet.2008.03.009
Abstract: Roughness length and zero-plane displacement over boreal, cool- and warm-temperate forests were observed and parameterised using forest structure data. Previous models for roughness length and zero-plane displacement using leaf area index and frontal area index did not describe intersite differences, and the model for zero-plane displacement did not express seasonal variations with the change of leaf area that was smaller in dense forest than in sparse forest. The observed results show that intersite differences of normalised zero-plane displacement were related to stand density, and seasonal variations were related to leaf area index at each forest, with the degree depending on stand density. From these observations, a new concept is proposed for normalised zero-plane displacement: the basal part is primarily determined by the density of stems and branches (stand density), while the seasonal variation depends on the density of leaves (leaf area index), which is limited to the residual of the basal part. Based on this concept, a new model was developed and verified to express both intersite differences and seasonal variations in observed roughness length and zero-plane displacement.
Type: article (author version)
URI: http://hdl.handle.net/2115/38247
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中井 太郎

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