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Royal Meteorological Institute of Belgium

Validation of the method to retrieve the Aerosol Optical Depth from the Brewer Ozone measurements First preliminary results of the aerosol campaign at Uccle. Royal Meteorological Institute of Belgium.

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Royal Meteorological Institute of Belgium

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  1. Validation of the method to retrieve the Aerosol Optical Depth from the Brewer Ozone measurements • First preliminary results of the aerosol campaign at Uccle Royal Meteorological Institute of Belgium Validation of the method to retrieve the AOD and first preliminary results of the aerosol campaign. RMI December 6th 2006.

  2. Validation of the method to retrieve the Aerosol Optical Depth from the Brewer Ozone measurements Anne Cheymol, Hugo De Backer, Weine Josefsson and René Stübi anne.cheymol@oma.be Cheymol et al., jgr, 2006 Royal Meteorological Institute of Belgium Validation of the method to retrieve the AOD. RMI December 6th 2006.

  3. Royal Meteorological Institute of Belgium Overview • Introduction • The Brewer instrument • Description of the method • Results • Measurements sites • Impact of the neutral density filter on AOD • Validation of the AOD between a Brewer and a sunphotometer • Comparisons between Brewer at the same place • Conclusions and perspectives Validation of the method to retrieve the AOD. RMI December 6th 2006.

  4. Royal Meteorological Institute of Belgium Role of aerosol particles • Most aerosol particles’s knowledge is in VIS and IR and not in UV • Important role in climate forcing • UV-B irradiance reduction by about 5-35% • Impact on Human health Validation of the method to retrieve the AOD. RMI December 6th 2006. 3

  5. smoke Clear day on November 9th 2006 Royal Meteorological Institute of Belgium Anthropogenic origin Polluted day on January 28th 2006 Photo by A. Delcloo and A. Mangold Validation of the method to retrieve the AOD. RMI December 6th 2006. 3

  6. Royal Meteorological Institute of Belgium Natural origin of aerosol Sea salt ejected from the sea in the air Photo by Plisson Validation of the method to retrieve the AOD. RMI December 6th 2006. 3

  7. Royal Meteorological Institute of Belgium Natural origin of aerosol Pollen Clean roof Photo from the web Validation of the method to retrieve the AOD. RMI December 6th 2006. 3

  8. Royal Meteorological Institute of Belgium Seasonal cycle of AOD at Uccle Validation of the method to retrieve the AOD. RMI December 6th 2006. 3

  9. Royal Meteorological Institute of Belgium Overview • Introduction • The Brewer instrument • Description of the method • Results • Measurements sites • Impact of the neutral density filter on AOD • Validation of the AOD between a Brewer and a sunphotometer • Comparisons between Brewer at the same place • Conclusions and perspectives Validation of the method to retrieve the AOD. RMI December 6th 2006.

  10. Royal Meteorological Institute of Belgium Over 100 Brewer stations Validation of the method to retrieve the AOD. RMI December 6th 2006 8

  11. 280-363 nm 306-320 nm Royal Meteorological Institute of Belgium 11 Validation of the method to retrieve the AOD. RMI December 6th 2006

  12. Royal Meteorological Institute of Belgium Morning Afternoon 12H Zenith angle = za sunset Rotation of the instrument during the day Validation of the method to retrieve the AOD. RMI December 6th 2006 9

  13. Royal Meteorological Institute of Belgium Summary of the Brewer measurements • 5 measurements/4mns every 30mns • Automatic rotation during the day to follow the sun • No cloud  direct sun measurement • 25° za 70 ° for one day at Uccle 10 Validation of the method to retrieve the AOD. RMI December 6th 2006

  14. Royal Meteorological Institute of Belgium Direct Sun radiation at 306, 310, 313, 316 and 320 nm Aerosol Optical Depth = attenuation of solar radiation by aerosol particles Validation of the method to retrieve the AOD. RMI December 6th 2006.

  15. Royal Meteorological Institute of Belgium Overview • Introduction • The Brewer instrument • Description of the method • Results • Measurements sites • Impact of the neutral density filter on AOD • Validation of the AOD between a Brewer and a sunphotometer • Comparisons between Brewer at the same place • Conclusions and perspectives Validation of the method to retrieve the AOD. RMI December 6th 2006.

  16. Royal Meteorological Institute of Belgium Attenuation of solar radiation Validation of the method to retrieve the AOD. RMI December 6th 2006. 3

  17. Ozone Molecule Aerosol particles Royal Meteorological Institute of Belgium Signal received by the Brewer S() = K() Io() exp[ Do3 () + Dray () + Daer (, sec(za))] 13 Validation of the method to retrieve the AOD. RMI December 6th 2006

  18. ln[ S() ]-Do3- Dray - () sec(za) ln[ K() Io () ] Royal Meteorological Institute of Belgium Langley plot method = * + Y = A * X + B 14 Validation of the method to retrieve the AOD. RMI December 6th 2006

  19. Royal Meteorological Institute of Belgium 5 DS scans/4mn Y = ln[S()] - Do3 - Dray A = -() *X = sec(za) +B = ln[K()Io ()] Langley plot method 18/06/00 for 306.3 nm 17 Validation of the method to retrieve the AOD. RMI December 6th 2006

  20. Royal Meteorological Institute of Belgium Selection of clear days for the Langley Plot Method • ozone stdev for individual DS measurements < 2.5 DU • za per day  20° • number of good data per day  50 • Distance between each point and the regression line < 4 (Y unit) • Daily mean absolute deviation from the LP regression line < 0.055 (Y units) 16 Validation of the method to retrieve the AOD. RMI December 6th 2006

  21. Royal Meteorological Institute of Belgium Calibration factor 65 Calibration factors at Uccle Average of these 65 calibration factors with error of about 0.2% Validation of the method to retrieve the AOD. RMI December 6th 2006. 4

  22. Royal Meteorological Institute of Belgium Summary of the method Validation of the method to retrieve the AOD. RMI December 6th 2006. 5

  23. Royal Meteorological Institute of Belgium Overview • Introduction • The Brewer instrument • Description of the method • Results • Impact of the neutral density filter on AOD • Validation of the AOD between a Brewer and a sunphotometer • Comparisons between Brewer at the same place • Conclusions and perspectives Validation of the method to retrieve the AOD. RMI December 6th 2006.

  24. Royal Meteorological Institute of Belgium Where? Validation of the method to retrieve the AOD. RMI December 6th 2006.

  25. Royal Meteorological Institute of Belgium 320 nm Time difference max = 3 min sunphotometer 368 nm Validation of the method to retrieve the AOD. RMI December 6th 2006.

  26. N = 1718 Standard filters N = 1934 Real filters Errors Royal Meteorological Institute of Belgium Filters impact on AOD c = 0.87 b = 0.80 ± 0.011 a = -0.08 ± 0.004 c = 0.98 b= 0.85 ± 0.004 a= 0.02 ± 0.0014 Validation of the method to retrieve the AOD. RMI December 6th 2006.

  27. Royal Meteorological Institute of Belgium Where? Validation of the method to retrieve the AOD. RMI December 6th 2006.

  28. Royal Meteorological Institute of Belgium 320 nm Hourly mean AOD compared for 2002 sunphotometer 368 nm Validation of the method to retrieve the AOD. RMI December 6th 2006.

  29. Royal Meteorological Institute of Belgium Comparison Arosa/Davos N = 335 c = 0.62 b = 0.56 ± 0.04 a = 0.02 ± 0.0006 Validation of the method to retrieve the AOD. RMI December 6th 2006.

  30. Royal Meteorological Institute of Belgium Overview • Introduction • The Brewer instrument • Description of the method • Physical equation • Langley plot method • Results • Impact of the neutral density filter on AOD • Validation of the AOD between a Brewer and a sunphotometer • Comparisons between Brewer at the same place • Conclusions and perspectives Validation of the method to retrieve the AOD. RMI December 6th 2006.

  31. Royal Meteorological Institute of Belgium Where? Validation of the method to retrieve the AOD. RMI December 6th 2006.

  32. Royal Meteorological Institute of Belgium Uccle 2002-2005 N = 5781 c = 0.98 b= 1.02 ± 0.003 a= 0.06 ± 0.001 Validation of the method to retrieve the AOD. RMI December 6th 2006.

  33. N = 3169 Royal Meteorological Institute of Belgium Arosa 2004 N = 2771 c = 0.94 b= 0.98 ± 0.006 a= 0.03 ± 0.002 c = 0.98 b= 0.98 ± 0.003 a= -0.04 ± 0.001 Validation of the method to retrieve the AOD. RMI December 6th 2006.

  34. Royal Meteorological Institute of Belgium Arosa 2004 N = 5290 c = 0.99 b= 0.98 ± 0.002 a= -0.02 ± 0.0005 Validation of the method to retrieve the AOD. RMI December 6th 2006.

  35. Royal Meteorological Institute of Belgium Summary of the comparisons Validation of the method to retrieve the AOD. RMI December 6th 2006.

  36. Royal Meteorological Institute of Belgium Overview • Introduction • The Brewer instrument • Description of the method • Physical equation • Langley plot method • Results • Impact of the neutral density filter on AOD • Validation of the AOD between a Brewer and a sunphotometer • Comparisons between Brewer at the same place • Conclusions and perspectives Validation of the method to retrieve the AOD. RMI December 6th 2006.

  37. Royal Meteorological Institute of Belgium Conclusions Important role of the filter of the Brewer spectrophotometer on the accuracy of AOD High level of confidence of the method used to retrieve the AOD: correlation coefficient > 0.94 slope ~ 1 Intercept max = 0.06 Validation of the Langley plot method with a comparison between Brewer spectrophotometer and a sunphotometer Validation of the method to retrieve the AOD. RMI December 6th 2006.

  38. Royal Meteorological Institute of Belgium Perspectives Application of the method at different Brewer stations Determination of relation between different aerosol parameters: AOD, ssa, type, size and backtrajectories analysis Validation of the method to retrieve the AOD. RMI December 6th 2006.

  39. First preliminary results of the aerosol campaign at Uccle Anne Cheymol , Willy Maenhaut, Alexander Mangold, Hugo De Backer, Jan Cafmeyer, Andy Delcloo, René Lemoine and Roeland Van Malderen Royal Meteorological Institute of Belgium Aerosol Campaign at Uccle. RMI December 6th 2006.

  40. Royal Meteorological Institute of Belgium Overview Objectives of the campaign The instruments and the first preliminary results Perspectives Aerosol Campaign at Uccle. RMI December 6th 2006.

  41. Royal Meteorological Institute of Belgium Objectives Determination of the relations between AOD, size and type of aerosol particles and air mass origin Aerosol Campaign at Uccle. RMI December 6th 2006.

  42. Inlet by Delcloo and Mangold PM10 Filter PM2.5 by Delcloo and Mangold by Delcloo and Mangold Royal Meteorological Institute of Belgium Sampling Aerosol Campaign at Uccle. RMI December 6th 2006.

  43. 20% anthropogenic source 61% anthropogenic source Coarse particle PM10-PM2.5 Fine particles PM2.5 Royal Meteorological Institute of Belgium Aerosol Campaign at Uccle. RMI December 6th 2006.

  44. inlet Royal Meteorological Institute of Belgium TEOM Aerosol Campaign at Uccle. RMI December 6th 2006.

  45. 01/02 03/01 Mean = 15.4 ug/m3 Royal Meteorological Institute of Belgium Mass of PM2.5 Aerosol Campaign at Uccle. RMI December 6th 2006.

  46. Royal Meteorological Institute of Belgium 01 February 2006 01/02 03/01 Aerosol Campaign at Uccle. RMI December 6th 2006.

  47. smoke Photo by A. Delcloo and A. Mangold Royal Meteorological Institute of Belgium 28/01 09/11 50 ug/m3 20 ug/m3 20 ug/m3 Aerosol Campaign at Uccle. RMI December 6th 2006. 3

  48. Royal Meteorological Institute of Belgium Aethalometer Mass of Black Carbon Aerosol Campaign at Uccle. RMI December 6th 2006.

  49. Royal Meteorological Institute of Belgium Perspectives 1 Determination of the relation between AOD, mass, size and type of particle and the air mass origin Aerosol studies is foreseen within the Antarctic project with BIRA and Ghent University Aerosol Campaign at Uccle. RMI December 6th 2006.

  50. snoepjes Royal Meteorological Institute of Belgium Most important perspectives Aerosol Campaign at Uccle. RMI December 6th 2006.

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