Vertical variability and effect of stability on turbulence characteristics down to the forest floor of a pine forest.
(2007) In Tellus. Series B: Chemical and Physical Meteorology 59. p.919-936- Abstract
- Among the fundamental problems in canopy turbulence, particularly near the forest floor, remain the local diabatic effects and linkages between turbulent length scales and the canopy morphology. To progress on these problems, mean and higher order turbulence statistics are collected in a uniform pine forest across a wide range of atmospheric stability conditions using five 3-D anemometers in the subcanopy. The main novelties from this experiment are: (1) the agreement between second-order closure model results and measurements suggest that diabatic states in the layer above the canopy explain much of the modulations of the key velocity statistics inside the canopy except in the immediate vicinity of the trunk space and for very stable... (More)
- Among the fundamental problems in canopy turbulence, particularly near the forest floor, remain the local diabatic effects and linkages between turbulent length scales and the canopy morphology. To progress on these problems, mean and higher order turbulence statistics are collected in a uniform pine forest across a wide range of atmospheric stability conditions using five 3-D anemometers in the subcanopy. The main novelties from this experiment are: (1) the agreement between second-order closure model results and measurements suggest that diabatic states in the layer above the canopy explain much of the modulations of the key velocity statistics inside the canopy except in the immediate vicinity of the trunk space and for very stable conditions. (2) The dimensionless turbulent kinetic energy in the trunk space is large due to a large longitudinal velocity variance but it is inactive and contributes little to momentum fluxes. (3) Near the floor layer, a logarithmic mean velocity profile is formed and vertical eddies are strongly suppressed modifying all power spectra. (4) A spectral peak in the vertical velocity near the ground commensurate with the trunk diameter emerged at a moderate element Reynolds number consistent with Strouhal instabilities describing wake production. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/639300
- author
- Launiainen, S ; Vesala, T ; Mölder, Meelis LU ; Mammarella, I ; Smolander, S ; Kolari, P ; Rannik, U ; Hari, P and Lindroth, Anders LU
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Tellus. Series B: Chemical and Physical Meteorology
- volume
- 59
- pages
- 919 - 936
- publisher
- Taylor & Francis
- external identifiers
-
- wos:000250752400014
- scopus:35348944831
- ISSN
- 0280-6509
- DOI
- 10.1111/j.1600-0889.2007.00313.x
- language
- English
- LU publication?
- yes
- id
- 7cdfb6b5-abbb-4489-9eb9-4d3b73c4db30 (old id 639300)
- date added to LUP
- 2016-04-04 08:34:57
- date last changed
- 2022-03-15 08:24:23
@article{7cdfb6b5-abbb-4489-9eb9-4d3b73c4db30,
abstract = {{Among the fundamental problems in canopy turbulence, particularly near the forest floor, remain the local diabatic effects and linkages between turbulent length scales and the canopy morphology. To progress on these problems, mean and higher order turbulence statistics are collected in a uniform pine forest across a wide range of atmospheric stability conditions using five 3-D anemometers in the subcanopy. The main novelties from this experiment are: (1) the agreement between second-order closure model results and measurements suggest that diabatic states in the layer above the canopy explain much of the modulations of the key velocity statistics inside the canopy except in the immediate vicinity of the trunk space and for very stable conditions. (2) The dimensionless turbulent kinetic energy in the trunk space is large due to a large longitudinal velocity variance but it is inactive and contributes little to momentum fluxes. (3) Near the floor layer, a logarithmic mean velocity profile is formed and vertical eddies are strongly suppressed modifying all power spectra. (4) A spectral peak in the vertical velocity near the ground commensurate with the trunk diameter emerged at a moderate element Reynolds number consistent with Strouhal instabilities describing wake production.}},
author = {{Launiainen, S and Vesala, T and Mölder, Meelis and Mammarella, I and Smolander, S and Kolari, P and Rannik, U and Hari, P and Lindroth, Anders}},
issn = {{0280-6509}},
language = {{eng}},
pages = {{919--936}},
publisher = {{Taylor & Francis}},
series = {{Tellus. Series B: Chemical and Physical Meteorology}},
title = {{Vertical variability and effect of stability on turbulence characteristics down to the forest floor of a pine forest.}},
url = {{http://dx.doi.org/10.1111/j.1600-0889.2007.00313.x}},
doi = {{10.1111/j.1600-0889.2007.00313.x}},
volume = {{59}},
year = {{2007}},
}