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5B.2 - Trace gas fluxes within the forest canopy
Thomas Foken, Franz X. Meixner
January 12, 2021, 19:15 - 19:20 MEZ
Abstract: Trance gas fluxes within and above a forest canopy are highly dependent on the turbulence state in the atmospheric boundary layer and within the canopy. Gravity waves and low-level jets have a strong influence on the trace gas exchange during the night. Not only the canopy can completely decouple from the atmosphere above, but also the underbrush can decouple from the trunk space. This has a significant influence on chamber measurements. In order to determine this decoupling, parallel radon measurements can be performed, the reaction NO with O3 can be investigated or, as a very reliable indicator, flux measurements in trunk space and surface concentration measurements can be coupled via a model approach. This approach corresponds to the hydrodynamical integration of the exchange coefficient directly from the surface (wall) to the measurement height. The latter is presented and documented with measurement results from the Waldstein site (DE-Bay).
Editor: Thomas Foken
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The book will be published on April 29, 2021