Changes of the aerodynamic characteristics of a flux site after an extensive windthrow

Titelangaben

Oliviera, Bruna R. F. ; Keizer, J. Jacob ; Foken, Thomas:
Changes of the aerodynamic characteristics of a flux site after an extensive windthrow.
In: Biogeosciences. Bd. 19 (2022) Heft 8 . - S. 2235-2243.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-19-2235-2022

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Abstract

A maritime pine plantation in central Portugal that has been continuously monitored using the eddy-covariance technique for carbon fluxes since a wildfire in 2017 was significantly affected by two storms during December 2019 that resulted in a large-scale windthrow. This study analyses the impacts of this windthrow on the aerodynamic characteristics of zero-plane displacement and roughness length and, ultimately, their implications for the turbulent fluxes. The turbulent fluxes were only affected to a minor degree by the windthrow, but the footprint area of the flux tower changed markedly so that the target area of the measurements had to be redetermined.