Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/hess-2017-4
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Jan 2017
Review status
This discussion paper is under review for the journal Hydrology and Earth System Sciences (HESS).
Explaining the convector effect in canopy turbulence by means of large-eddy simulation
Tirtha Banerjee, Frederik De Roo, and Matthias Mauder Karlsruhe Institute of Technology (KIT) Institute of Meteorology and Climate Research, Atmospheric Environmental Research (IMKIFU), D-82467 Garmisch-Partenkirchen, Germany
Abstract. Semi-arid forests are found to sustain a massive sensible heat flux in spite of having a low surface to air temperature difference by lowering the aerodynamic resistance to heat transfer (rH) – a property called canopy convector effect (CCE). In this work large-eddy simulations are used to demonstrate that CCE appears more generally in canopy turbulence. It is indeed a generic feature of canopy turbulence: rH of a canopy is found to reduce with increasing unstable stratification, which effectively increases the aerodynamic roughness for the same physical roughness of the canopy. This relation offers a sufficient condition to construct a general description of CCE. In addition, we review existing parameterizations for rH from the evapotranspiration literature and test to what extent they are able to capture the CCE, thereby exploring the possibility of an improved parameterization.

Citation: Banerjee, T., De Roo, F., and Mauder, M.: Explaining the convector effect in canopy turbulence by means of large-eddy simulation, Hydrol. Earth Syst. Sci. Discuss., doi:10.5194/hess-2017-4, in review, 2017.
Tirtha Banerjee et al.
Tirtha Banerjee et al.
Tirtha Banerjee et al.

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Short summary
The canopy convector effect in the context of canopy turbulence was recently introduced by Rotenberg and Yakir (Science, 2010). However, there was a lack of understanding of this phenomenon as a generic feature of canopy turbulence as we have demonstrated in this manuscript. Uncertainties of existing parameterizations of canopy aerodynamic resistance to heat transfer are discussed and possible remedies are suggested.
The canopy convector effect in the context of canopy turbulence was recently introduced by...
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