Editorial Type:
Article
Article Type:
Research Article

Evaluation of the Town Energy Balance Model in Cold and Snowy Conditions during the Montreal Urban Snow Experiment 2005

A. Lemonsu Centre National de Recherches Météorologiques, Météo-France, Toulouse, France

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S. Bélair Environment Canada, Meteorological Research Division, Dorval, Quebec, Canada

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J. Mailhot Environment Canada, Meteorological Research Division, Dorval, Quebec, Canada

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S. Leroyer Atmospheric and Environmental Research Laboratory, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada

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Print Publication:
01 Mar 2010
DOI:
https://doi.org/10.1175/2009JAMC2131.1
Page(s):
346–362
Restricted access

Abstract

Using the Montreal Urban Snow Experiment (MUSE) 2005 database, surface radiation and energy exchanges are simulated in offline mode with the Town Energy Balance (TEB) and the Interactions between Soil, Biosphere, and Atmosphere (ISBA) parameterizations over a heavily populated residential area of Montreal, Quebec, Canada, during the winter–spring transition period (from March to April 2005). The comparison of simulations with flux measurements indicates that the system performs well when roads and alleys are snow covered. In contrast, the storage heat flux is largely underestimated in favor of the sensible heat flux at the end of the period when snow is melted. An evaluation and an improvement of TEB’s snow parameterization have also been conducted by using snow property measurements taken during intensive observational periods. Snow density, depth, and albedo are correctly simulated by TEB for alleys where snow cover is relatively homogeneous. Results are not as good for the evolution of snow on roads, which is more challenging because of spatial and temporal variability related to human activity. An analysis of the residual term of the energy budget—including contributions of snowmelt, heat storage, and anthropogenic heat—is performed by using modeling results and observations. It is found that snowmelt and anthropogenic heat fluxes are reasonably well represented by TEB–ISBA, whereas storage heat flux is underestimated.

Corresponding author address: Dr. A. Lemonsu, CNRM/GMME/TURBAU, Météo-France, 42 Ave. Gaspard Coriolis, 31057 Toulouse CEDEX, France. Email: aude.lemonsu@meteo.fr

Abstract

Using the Montreal Urban Snow Experiment (MUSE) 2005 database, surface radiation and energy exchanges are simulated in offline mode with the Town Energy Balance (TEB) and the Interactions between Soil, Biosphere, and Atmosphere (ISBA) parameterizations over a heavily populated residential area of Montreal, Quebec, Canada, during the winter–spring transition period (from March to April 2005). The comparison of simulations with flux measurements indicates that the system performs well when roads and alleys are snow covered. In contrast, the storage heat flux is largely underestimated in favor of the sensible heat flux at the end of the period when snow is melted. An evaluation and an improvement of TEB’s snow parameterization have also been conducted by using snow property measurements taken during intensive observational periods. Snow density, depth, and albedo are correctly simulated by TEB for alleys where snow cover is relatively homogeneous. Results are not as good for the evolution of snow on roads, which is more challenging because of spatial and temporal variability related to human activity. An analysis of the residual term of the energy budget—including contributions of snowmelt, heat storage, and anthropogenic heat—is performed by using modeling results and observations. It is found that snowmelt and anthropogenic heat fluxes are reasonably well represented by TEB–ISBA, whereas storage heat flux is underestimated.

Corresponding author address: Dr. A. Lemonsu, CNRM/GMME/TURBAU, Météo-France, 42 Ave. Gaspard Coriolis, 31057 Toulouse CEDEX, France. Email: aude.lemonsu@meteo.fr

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