National report : French contribution by D. Martin

  1. The French participation is quite light. During the last meeting at Cheju, K. Suhre (Laboratoire d’Aérologie), D. Martin and T.J. Song (Laboratoire des Sciences du Climat et de l’Environnement have expressed their interest in the modeling of the Lagrangian experiments thanks to the French 1D Meso NH/chemistry model. Furthermore, P. Chazette (LSCE) and co-workers were interested in the closure experiment performed from a ground station and using a lidar. In other respects, at this period, China refused the clearance of the US aircraft over the Chinese area. Thus, D. Martin has proposed the use of a Chinese aircraft equipped with the SYIMCA kit. The SYIMCA instrumentation has been developed for urban pollution studies and is described in the table 1. Chinese scientists aboard a Chinese aircraft would set up such a kind of device. Its use should help to a better characterization of initial conditions.

  2.  
  3. K. Suhre has given up his research activities and will moved to Germany in January 2000. C. Mari, who is also involved in the PEM-W project, will now take on the French modeling activities. P. Chazette has preferred to focus his research activity to other source regions. However, H. Cachier , L. Gomes and co-workers are now more directly involved in Ace-Asia.

  4.  
  5. Beside the modeling aspects, the French participation would now be focused onto three experimental points.

    The closure experiment

    Source estimation
    Our main topics will deal with: Gas particle interaction in source region.
  6. Tools to be needed
  7. In China

    In France
    Several developments are going on to improve SYIMCA.

 

Table 1: SYIMCA kit

The SYIMCA kit (SYstème Intégré de Mesure de Constituants Atmosphériques) is composed by different modules (see below). 24V batteries provide the power supply. Data outputs are stored in a PC. Depending on the airborne instrumentation, the weight of the instrument does not exceed 50-60kg. The unique interface with the platform is the air inlets.
 
 
Function
Principe
Detection limit
Response time
O3
UV Absorption
2 ppbv
7s
CO
IR correlation Spectrometry
75 ppbv
30s
NO2
Luminol Chimiluminescence
100 pptv
1s
CO2
IR Differential Absorption
0.1 ppm
1s
Black carbon
visible differential Absorption
100 ng/m3
15s
PTU
P : piezo-electric
T : Ni resistance
U : Capacitive sensor
Resolution :
0.02 hPa
°C.
0.13 %
1s
Latitude, longitude
GPS
 
1s
Data Acquisition
PCMCIA, Labview, PC
   
NMHC 
12 inox flasks
10 pptv
Laboratory analysis