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)