On the effect of clearcuts on turbulence structure above a forest canopy
- 89 Downloads
The modification of the flow structure arising from the removal of large patches of trees in a managed forest plantation near Gainesville, Florida is described. Using wavelet analysis of turbulence measurements taken above a forest canopy hundreds of meters downwind from the forest gap and well outside the footprint, the present paper examines changes in flow characteristics and demonstrates that the presence of the nearby clearcut introduces extraneous coherent events passing by the eddy-covariance flux measurement system.
KeywordsCoherent Structure Forest Canopy Turbulence Structure Wavelet Spectrum Wavelet Variance
Unable to display preview. Download preview PDF.
- Baldocchi, D, Falge, E, Gu, L, Olson, R, Hollinger, D, Running, S, Anthoni, P, Bernhofer, C, Davis, K, Evans, R, Fuentes, J, Goldstein, A, Katul, G, Law, B, Lee, X, Malhi, Y, Meyers, T, Munger, W, Oechel, W, Paw, U KT, Pilegaard, K, Schmid, HP, Valentini, R, Verma, S, Vesala, T, Wilson, K, Wofsy, S 2001FLUXNET: a new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densitiesBull Amer Meteor Soc8224152434CrossRefGoogle Scholar
- Collineau, S, Brunet, Y 1993Detection of turbulent coherent motions in a forest canopy. Part I: Wavelet analysisBound-Layer Meteor65357379Google Scholar
- Shaw RH (1985) On diffusive and dispersive fluxes in forest canopies. In: Hutchinson BA, Hicks BB (eds) The forest-atmosphere interaction. Reidel Publishing Company, pp 407–419Google Scholar
- Turner BJ, Leclerc MY, Gauthier M, Moore KE, Fitzjarrald DR (1994) Identification of turbulence structures above a forest canopy using the wavelet transform. J Geophys Res 99(D1): 1919–1926 (special issue devoted to the NASA ABLE 3-B experiment)Google Scholar
- Thomas C, Mayer J-C, Meixner FX, Foken T (2006) Analysis of low-frequency turbulence above tall vegetation using a Doppler sodar. Bound-Layer Meteor: DOI 10.1007/s10546-005-9038-0Google Scholar