Synergetic use of mobile DOAS observation during CINDI-2

A. Merlaud, F. Tack, F. Hendrick, M. Van Roozendael (BIRA), D. Constantin, A. Rosu (UGal), K. Riffel, S. Donner, T. Wagner (MPIC), S. Schreier (Boku), A. Richter (IUP Bremen), H. Eskes (KNMI)

Outline

• Status in Yokohama

• VCDs of Mobile DOAS vs BIRA Max-DOAS

• Azimuthal variability ?

• Comparison with models

• Comparison with OMI

Preliminary conclusions in September 2017

• Agreement between BIRA Mobile and MaxDOAS

• Good agreement between DOAS instruments and Lotos Euros on Sept 13

• seems less good on Sept 14, model > measurements in afternoon

• Measurements > model on Sept 15 all day

• What s next?

5-sept 6-sept 7-sept 8-sept 9-sept 10-sept 11-sept

BOKU

BIRA_car

BIRA_bike

MPIC

UGAL

12-sept 13-sept 14-sept 15-sept 16-sept 17-sept 18-sept

BOKU

BIRA_car

BIRA_bike

MPIC

UGAL

19-sept 20-sept 21-sept 22-sept 23-sept 24-sept 25-sept

BOKU

BIRA_car

BIRA_bike

MPIC

UGAL

Overview of the measurements

Aeromobil vs BIRA Max-DOAS (13-14-15 September)

BikeDOAS vs BIRA Max-DOAS (13-14-15 September)

UGAL Mobile DOAS vs BIRA Max-DOAS (14-15-24 September)

MPIC Mini MaxDOAS vs BIRA Max-DOAS (14-15-24 September)

BOKU Mini MaxDOAS vs BIRA Max-DOAS (13-14-15 September)

Coordinated Mobile DOAS measurements during CINDI-2

13/09/2016

14/09/2016

15/09/2016

8.4 – 8.48 UTC 14.42 – 14.48 UTC 8.92 – 8.98 UTC

Azimuthal variability in the VCDs seen with the BIRA Max-DOAS

Measurements vs Lotos Euros

-7 km resolution -surface to 3.5 km -O3, NO2, NO, SO2, CO, PM10, PM2.5

Measurements vs Lotos Euros 13 September 2016

Measurements vs Lotos Euros 14 September 2016

Measurements vs Lotos Euros 15 September 2016

Lotos Euros OMI

13 September 2016 at 12 UT

Can the model be used to reduce the representativeness error between the Mobile DOAS and OMI ?

Conclusions

• Dataset of mobile doas vcds consistent with Max-DOAS

• Limited azimuthal variability on Sept 13-14-15

• Including additional measurements confirms earlier comparisons with Lotos Euros on Sept 13-14-15

• Higher VCDs on 15 September correlated with transport from most polluted areas

• For comparison with satellite, how do mobile measurements reduce the representativeness error? Does it help to include a model-based correction?