The Effect of the Vertical Source Distribution on Scalar Statistics within and above a Forest Canopy |
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| Authors: | S L Edburg D Stock B K Lamb E G Patton |
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| Institution: | 1.Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering,Washington State University,Pullman,USA;2.Department of Mechanical Engineering,Washington State University,Pullman,USA;3.Mesoscale and Microscale Meteorology Division,National Center for Atmospheric Research,Boulder,USA |
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| Abstract: | Little is known about in-canopy processes that may alter forest–atmosphere exchanges of trace gases and aerosols. To improve
our understanding of in-canopy mixing, we use large-eddy simulation to study the effect of scalar source/sink distributions
on scalar concentration moments, fluxes, and correlation coefficients within and above an ideal forest canopy. Scalars are
emitted from: (1) the ground, (2) the canopy, and (3) both the ground and the canopy; a scalar is also deposited onto the
canopy. All scalar concentration moments, fluxes, and correlation coefficients are affected by the source location/distribution,
as is the scalar segregation intensity. We conclude that vertical source/sink distribution has a profound impact on scalar
concentration profiles, fluxes, correlation coefficient, and scalar segregation. |
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