Investigation of the decay of turbulence over a forest during the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) Experiment
Abstract
The Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) experiment was conducted from 14 June - 8 July 2011 in Lannemezan, France with the aim of gaining improved understanding of various transitory processes associated with the afternoon boundary layer. As part of this experiment, a tall eddy covariance flux tower was instrumented over a forest dominated by European Larch trees. Measurements on the tower included incoming and outgoing components of long and short wave radiation as well as fluxes of sensible heat, moisture momentum and carbon dioxide at 10 m above the canopy. At approximately the canopy top measurements of momentum and sensible heat fluxes were also made. For this work, we focus on describing the overall decay of turbulence statistics associated with the transport of heat, momentum, and scalars. In addition, the effect of the balance between mechanical and buoyancy forcing (as function of distance from top of canopy) on the decay of turbulence statistics will be described and compared to existing work in the literature.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.A53D..07A
- Keywords:
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- 0325 ATMOSPHERIC COMPOSITION AND STRUCTURE / Evolution of the atmosphere;
- 1631 GLOBAL CHANGE / Land/atmosphere interactions;
- 1843 HYDROLOGY / Land/atmosphere interactions