1. WP12 : Differences betweenRural and Urban Aerosols
J. Pelon, L. Sauvage, Coordination
Link to General Objectives :
Take advantage of measurements
performed in the network of advanced
Lidar at selected stations
to perform comparative analysis of the
boundary layer height evolution
Analyse evolution of aerosol properties in
the PBL at the same scales in rural and
Urban areas
- provide data for modelling
Diurnal cycle measurements on alert linked to WP6

2. WP12 : GENERAL
Objectives : observe difference in characteristics of boundary aerosols and boundary layer height between rural and urban sites
4 groups of close-by stations involved :
Athens – Oxylithos (AT) orography (sea, mountains)
Napoli-Potenza (NP)  orography (sea, mountains)
Hamburg-Bergerdorf (HB)
Palaiseau-Paris (PP)

3. WP12 : Previous Analyses In Europe : measurements over Paris area
Comparison of ABL characteristics in Palaiseau and Paris
(Dupont et al., 1998; Menut et al., 1999)
 Differences in ABL h (especially in the morning) and larger
heat flux over Paris (Heat Island effect)
RH effects dominant over Palaiseau (Paris warmer and
dryer)

4. Measurements within WP 12
AT : mobile system being developed, first measurements end of 2002
HH : development of new system and implementation in Bergerdorf. Comparative measurements undertaken in
several high pressure systems in HB starting in 2001
PP : Strategy was to use CIMEL micro-lidar. Operational system
not available
 Alternative : use of mobile Raman system developed
for H20/aerosols at SA
Operation started end of 2002

5. WP12 : Athens -Oxylithos Larger backscattering
Over Athens Above the ABL
Wind from Athens V
Low ABLh High RH

6. WP12 : Lecce / Napoli / Potenza
Lecce
Potenza
Napoli
site
18°06’E
40°20’N
15°71’E
40°06’N
14°11’E
40°50’N
Distance (Km)
280
Altitude a.s.l. (m) 30
820
118
Distance from the city (Km) 3 10
Note
Lidar is at the same altitude level as the city
1)    Several artificial basins have been realised in the neighbourhood
2) A high polluting industrial plant has been located very near to the lidar station
1)    Lidar station located above the ground level of the city, on its West boundary
2)    Dominant wind is from West direction
3)    On Monday and Thursday the traffic is limited by local authorities
120

7. WP12 : Napoli - Potenza

8. WP12 : Hambourg- Bergerdorf
4 April 2002
E wind
dh/dt = 100m/h

9. WP12 : Hambourg- Bergerdorf
dh/dt = 250m/h
3 June 2002
SSE Wind

10. WP12 : Hambourg- Bergerdorf

12. WP12 : Palaiseau- Saint Mandé
SE wind
19/12/2002

13. WP12 : Palaiseau- Saint Mandé
06/01/2003
WP12 : Palaiseau- Saint Mandé
NE wind

14. WP12 : Palaiseau- Saint Mandé
17/01/2003
WP12 : Palaiseau- Saint Mandé
SE wind

15. WP12 : Palaiseau - Saint Mandé
24/01/2003
WP12 : Palaiseau - Saint Mandé
NNE wind

16. WP12 : Palaiseau- Saint Mandé
27/01/2003
WP12 : Palaiseau- Saint Mandé
WNW wind

17. WP12 : Palaiseau- Saint Mandé
30/01/2003
WP12 : Palaiseau- Saint Mandé
WNW wind

18. WP12 : Palaiseau- Saint Mandé

19. WP12 : Palaiseau - Aeronet
RH~cte
NWW
Air masses
From rural
Area
NNE wind
Air masses
From Paris
Area

20. Conclusion Difficult to set : requires two systems, two sites of
Operation in nearby rural and urban conditions
No significant difference in ABL h between Hamburg and
Bergerdorf. ABL slightly higher in Paris.
No systematic difference in RH over Paris area.
Difference in backscattering have been
observed but requires additional measurements