Explaining the convector effect in canopy turbulence by means of large-eddy simulation
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 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: 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 the 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.
- Authors:
-
[1];
[1]
- Karlsruhe Inst. of Technology (KIT), Garmisch-Partenkirchen (Germany). Inst. of Meteorology and Climate Research. Atmospheric Environmental Research (IMK-IFU)
- Publication Date:
- Research Org.:
- Karlsruhe Inst. of Technology (KIT), Garmisch-Partenkirchen (Germany); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE; German Research Foundation (DFG); Helmholtz Association (Germany)
- OSTI Identifier:
- 1369206
- Report Number(s):
- LA-UR-17-22651
Journal ID: ISSN 1607-7938
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Hydrology and Earth System Sciences (Online)
- Additional Journal Information:
- Journal Name: Hydrology and Earth System Sciences (Online); Journal Volume: 21; Journal Issue: 6; Journal ID: ISSN 1607-7938
- Publisher:
- European Geosciences Union (EGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; canopy turbulence; large eddy simulation; canopy convector effect; aerodynamic resistance
Citation Formats
Banerjee, Tirtha, De Roo, Frederik, and Mauder, Matthias. Explaining the convector effect in canopy turbulence by means of large-eddy simulation. United States: N. p., 2017.
Web. doi:10.5194/hess-21-2987-2017.
Banerjee, Tirtha, De Roo, Frederik, & Mauder, Matthias. Explaining the convector effect in canopy turbulence by means of large-eddy simulation. United States. https://doi.org/10.5194/hess-21-2987-2017
Banerjee, Tirtha, De Roo, Frederik, and Mauder, Matthias. Tue .
"Explaining the convector effect in canopy turbulence by means of large-eddy simulation". United States. https://doi.org/10.5194/hess-21-2987-2017. https://www.osti.gov/servlets/purl/1369206.
@article{osti_1369206,
title = {Explaining the convector effect in canopy turbulence by means of large-eddy simulation},
author = {Banerjee, Tirtha and De Roo, Frederik and Mauder, Matthias},
abstractNote = {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 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: 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 the 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.},
doi = {10.5194/hess-21-2987-2017},
journal = {Hydrology and Earth System Sciences (Online)},
number = 6,
volume = 21,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
A Column Canopy‐Air Turbulent Diffusion Method for Different Canopy Structures
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