Explaining the convector effect in canopy turbulence by means of large-eddy simulation

Banerjee, Tirtha; De Roo, Frederik; Mauder, Matthias

doi:10.5194/hess-21-2987-2017

Title: Explaining the convector effect in canopy turbulence by means of large-eddy simulation

Journal Article · Tue Jun 20 00:00:00 EDT 2017 · Hydrology and Earth System Sciences (Online)

DOI:https://doi.org/10.5194/hess-21-2987-2017· OSTI ID:1369206

^[1]; De Roo, Frederik ^[1];

^[1]

Karlsruhe Inst. of Technology (KIT), Garmisch-Partenkirchen (Germany). Inst. of Meteorology and Climate Research. Atmospheric Environmental Research (IMK-IFU)

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 (r_H) – a property called the canopy convector effect (CCE). In this work large-eddy simulations are used to demonstrate that the CCE appears more generally in canopy turbulence. It is indeed a generic feature of canopy turbulence: r_H 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 the CCE. In addition, we review existing parameterizations for r_H from the evapotranspiration literature and test to what extent they are able to capture the CCE, thereby exploring the possibility of an improved parameterization.

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Research Organization:: Karlsruhe Inst. of Technology (KIT), Garmisch-Partenkirchen (Germany); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; German Research Foundation (DFG); Helmholtz Association (Germany)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1369206

Report Number(s):: LA-UR-17-22651

Journal Information:: Hydrology and Earth System Sciences (Online), Vol. 21, Issue 6; ISSN 1607-7938

Publisher:: European Geosciences Union (EGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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54 ENVIRONMENTAL SCIENCES
canopy turbulence
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Title: Explaining the convector effect in canopy turbulence by means of large-eddy simulation

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