1. Hugo De Backer, Roeland Van Malderen72
Study of ozone and aerosol and their influence on climate and UV radiation
(STCE WP RMI B)
Hugo De Backer, Roeland Van Malderen
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

2. Study of ozone and aerosol and their influence on climate and UV radiation72
Overview
Aerosol and UV
Relations between ozone, aerosol, global solar radiation and UV
Available aerosol information
UV forecasts
Future plans
Ozone analysis
Total ozone
Ozone profiles
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

3. Study of ozone and aerosol and their influence on climate and UV radiation72
Trends in daily UV dose, global radiation, ozone and aerosol optical depth ( )
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

4. Total ozone available from operational models (DWD, ECMWF, …)
Study of ozone and aerosol and their influence on climate and UV radiation 72
UVI forecast for clear sky needs ozone and aerosol optical properties (AOD and SSA) in the UV region
Total ozone available from operational models (DWD, ECMWF, …)
Aerosol information available:
Measurements of AOD from CIMEL instrument (BIRA)
Measurement of AOD from Brewer spectrophotometer
Composition analysis from sampling campaign (Collaboration UGent)
Modeling: AOD and SSA from composition (OPAC)
Composition: from air quality models (CHIMERE, …)
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

5. Study of ozone and aerosol and their influence on climate and UV radiation72
Differences between measured and modeled UVI as function of AOD for different assumptions of aerosol composition
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

6. UV forecast, recently extended in time:
Study of ozone and aerosol and their influence on climate and UV radiation 72
UV forecast, recently extended in time:
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

7. Study of ozone and aerosol and their influence on climate and UV radiation72
Future plans:
Comparison of (BIRA CIMEL) with nm (KMI Brewers)
Use of measured or modeled AOD information for UVI forecast
Test forecasts for other regions in Belgium (compare with broadband measurements of BIRA)
Installation of CIMEL sunphotometer in Dourbes
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

8. Ozone observations: Used for:
Study of ozone and aerosol and their influence on climate and UV radiation 72
Ozone observations:
Daily total ozone observation with spectrophotometers
3 times per week ozone profiles with balloon soundings
Stored in international data-bases (WOUDC, NILU)
Used for:
validation of satellite profiles (a.o. within O3MSAF)
analysis of particular atmospheric events
long term changes
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

9. Study of ozone and aerosol and their influence on climate and UV radiation72
Total Ozone
measured since mid 1971
measured with either a Dobson or Brewer spectrophotometer (016 and 178)
← Fuego
← El Chichon
← Pinatubo
overall: (strongest in spring!)
double trend:
1971 – 1991
minimum in (Pinatubo)
from mid 90s on (Montréal Protocol)
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

10. Vertical ozone profiles
Study of ozone and aerosol and their influence on climate and UV radiation 72
Vertical ozone profiles
measured since Jan 1969
measured 3 times a week, with radiosondes
top 3 world longest ozone sounding series!
low ozone in troposphere ☹ lohigh ozone in stratosphere ☺
ozone peak in Febr - Apr
tropopause: barrier for strato-tropo loexchange in Jan - July?
tropopause trends
UT humidity trends
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

11. Vertical ozone profiles
Study of ozone and aerosol and their influence on climate and UV radiation 72
Vertical ozone profiles
globally: ozone in troposphere llllllllllllllllllllllozone in stratosphere
tropopause = border between loand in Feb – June
in lower stratosphere in loJuly - Dec
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

12. Vertical ozone profiles
Study of ozone and aerosol and their influence on climate and UV radiation 72
Vertical ozone profiles
largest stratospheric ozone lodecline in
especially lower-stratospheric loozone recovery in
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009

13. Study of ozone and aerosol and their influence on climate and UV radiation72
Future plans
multiple regression approach (annual cycle, solar cycle, QBO, volcanic effects, EESC)
correlation between cosmic rays and ozone depletion? (highest CR intensity  strongest ozone hole?)
participation in quality check/quality assurance activities for ozone observations of WMO
Hugo De Backer, Roeland Van Malderen KMI, Ringlaan 3, B-1180 Brussels
STCE, Annual meeting, Brussels, 8 June 2009