ALADIN-2007-Oslo (Norway) April 2007

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1 Improving the SURFEX/TEB scheme: 1 D validation in a street canyon R. Hamdi and V. Masson SURFEX coupled off line to ALADIN: preliminary results over Belgium R. Hamdi and A. Deckmyn ALADIN-2007-Oslo (Norway) April 2007

2 Improving the SURFEX/TEB scheme: 1 D validation in a street canyon R. Hamdi 1 and V. Masson 2 1. Royal Meteorological Institute, Brussels, Belgium. 2. CNRM, Météo France, Toulouse, France. ALADIN-2007-Oslo (Norway) April 2007

3 Plan Measurement site (BUBBLE) (Basel UrBan Boundary Layer Experiment) The TEB scheme Improving the parameterization Results and discussions Conclusion

4 Basel Sperrstrasse (U1) Tower height : Building height : % Roof : % Vegetation : Wall/plane area ratio : Canyon aspect ratio H/W : 32 m 14.6 m 54% 16% T, U, V, q, TKE, QH, QE A, B, C, D, E, F (Ultrasonic anemometer thermometer) 3.2 m et 31.5 m (Pyranometer, Pyrgeometer) Q*, K, K, L, L ALADIN 2007 Oslo (Norway) April (3/15)

5 Urban parameterization TEB (Masson 2000) * Ensemble of urban canyons * Surface temperatures resolved for each of the 3 urban surfaces roads, roofs and walls * Surface energy budget resolved for each urban surface * The averaged fluxes are calculated at the top of the canyon via the aerodynamic resistances Masson et al * Diagnostic temperature and wind inside the canyon ALADIN 2007 Oslo (Norway) April (4/15)

6 Improving the parameterization (1) 1. Surface scheme u T =... =... Tke q u T =... =... Forcing TEB TEB Tke q TEB TEB ALADIN 2007 Oslo (Norway) April (5/15) SURFEX layer

7 Improving the parameterization (2) 1. Momentum * Vertical surfaces (Walls): U TEB = C D S v / V air U 2 U wind speed, Sv ; Sh vertical (horizontal) surface area of the buildings, CD drag coefficient. * Horizontal surfaces (roads, roofs): 2. Turbulent kinetic energy Production of turbulence by walls: U Tke 3. Temperature TEB = U 2* S h / V air TEB =C D S v /V air U 3 * The heat turbulent fluxes Qh are calculated between roof/road/wall and the atmosphere. * This term is added at each atmospheric level in contact with the buildings. roof road wall Q Q Q T h h h TEB = S h /V air S v /V air 4. Mixing length C p C p Modification of the mixing length Lm in the presence of buildings according to (Macdonald, L m =H z H if 2000 ; Belcher et al. 2003): L m =H ALADIN 2007 Oslo (Norway) April (6/15) z H z top H [ L m top H ] if z H (H : mean buildings height)

8 1-D SURFEX configuration Forcing % ISBA = 16% % TEB = 84% SURFEX layer with % roof = 54% The period of the simulations from 16/06/2002 to 30/06/2002 Forcing is applied with 10 min time step to: wind Temperature Humidity downward global short and long wave radiation. ALADIN 2007 Oslo (Norway) April (7/15) Calculation point Two simulations: ''NEW'' with the prognostic version of SURFEX ''ORI'' with the diagnostic version of SURFEX.

9 Results: wind speed ALADIN 2007 Oslo (Norway) April (8/15)

10 Results: wind speed ALADIN 2007 Oslo (Norway) April (9/15)

11 Results: temperature ALADIN 2007 Oslo (Norway) April (10/15)

12 Results: momentum exchange 1 U *= w ' u ' 2 w ' v ' 2 4 ALADIN 2007 Oslo (Norway) April (11/15)

13 Results: turbulent exchange of heat ALADIN 2007 Oslo (Norway) April (12/15)

14 Results: turbulent kinetic energy ALADIN 2007 Oslo (Norway) April (13/15)

15 Results: energy balance at the top of the canyon ALADIN 2007 Oslo (Norway) April (14/15)

16 Conclusion Bias = New(Ori) Obs ; RMSE is the root mean square error. U(m.s 1) Level (m) T ( C) U* (m.s 1) QH (W.m 2) Obs New RMSE New RMSE Ori Ori Bias New Bias Ori ALADIN 2007 Oslo (Norway) April (15/15)

17 Perspectives * Validation over a long period (1 year) and for others urban sites. ISBA-canopy TEB-canopy SURFEX Diagnostic: * T2m, H2m * Wind 10 m ALADIN 2007 Oslo (Norway) April (15/15) Prognostic: * T2m, H2m * Wind 10 m

18 SURFEX coupled off line to ALADIN: preliminary results over Belgium ADAPTATION DOWNSCALING ERA40 FULLPOS 10 km resolution over Belgium ECOCLIMAP Atmospheric forcing at 50 m T, P, Hu, Wind, Precipitation, downward Radiation T2m, H2m wind10m ALADIN 2007 Oslo (Norway) April (1/2) SURFEX (off-line)

19 T2m SURFEX decreases the RMS error ALADIN 2m T are too low Anticyclonic situation with very weak wind ALADIN 2007 Oslo (Norway) April (2/2) The same result is found for winter 2001

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