Aude Lemonsu, S. Bélair, J. Mailhot
Urban canopy models are physically-based models parameterizing radiative, energetic and turbulent exchanges between urban canopy and atmosphere
Town Energy Balance, TEB (Masson, BLM, 2000) Simplified 3D geometry of urban canopy
(idealized canyon according to Oke, 1987)
Radiation trapping inside the street
Heat storage
Mean urban microclimate inside the street
Water and snow on roads and roofs
Anthropogenic forcing of heat and humidity
- Mexico city center(Masson et al., JAM, 2002)
- Light-industrial site in Vancouver(Masson et al., JAM, 2002)
- French old city core (Marseille)(Lemonsu et al., JAM, 2004)
- French suburban catchment (Lemonsu et al., HP, 2006)
Marseille
Mexico
Vancouver
Rezé, Nantes
TEB off-line evaluation
Q* QH QE ΔQS
W m
-2
Surface energy balanceAverage on 21 days of simulation
Time (hr) Time (hr) Time (hr) Time (hr)
ModelObs
TEB off-line evaluationMarseille city center (ESCOMPTE-CLU, summer 2001)
Urban canopy models are coupled to atmospheric mesoscale models in order to simulate the impact of built-up covers on atmospheric boundary layer and local meteorology
The coupling of TEB with GEM and MC2 models requires:
To implement a new type of surface in the physics package
to include built-up covers
To provide new input databases Urban land-use land-cover databases Anthropogenic sources of heat and humidity
Coupling with atmospheric models
Sea ice
SoilVegetation Glaciers
Water
Urban
Coupling with atmospheric models
Atmospheric model
zatm
zatm
zatm
Vegetated canopy
Urban canopy
Water body
TEB
6
4
2
0
m s-
1
Meso-NH, included TEB, has been run for French cities Urban heat island Specific structure of the urban boundary layer Urban breeze and urban plume
Atmospheric modeling including TEB
Paris
Lemonsu and Masson, BLM, 2002
TEB is now included in the physics package of GEM and MC2
The system is currently evaluated for North-American cities
Oklahoma City (Joint Urban 2003) under warm and dry conditions
- North-American city centers- Large residential irrigated districts
Montreal (MUSE) during wintertime- Evaluation of the snow scheme
New Canadian urban modeling system
Oklahoma City
Montreal (MUSE 2005)