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The GLOBE Aerosol Monitoring Project

The GLOBE Aerosol Monitoring Project. Joris de Vroom, Tim Vlemmix, Folkert Boersma, Ellen Brinksma, Pieternel Levelt. Outline. The GLOBE program Measurement principle Campaign approach 2007 validation results. G LOBAL L EARNING AND O BSERVATIONS TO B ENEFIT THE E NVIRONMENT.

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The GLOBE Aerosol Monitoring Project

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  1. The GLOBE Aerosol Monitoring Project Joris de Vroom, Tim Vlemmix, Folkert Boersma, Ellen Brinksma, Pieternel Levelt The GLOBE aerosol measurement campaign

  2. Outline The GLOBE program Measurement principle Campaign approach 2007 validation results The GLOBE aerosol measurement campaign

  3. GLOBAL LEARNING AND OBSERVATIONS TO BENEFIT THE ENVIRONMENT The GLOBE aerosol measurement campaign

  4. The international GLOBE program • Students collect data that can be used for scientific research • Students report on the internet • 18,000 schools worldwide • Elementary and secondary school students • Various subjects: water, soil, vegetation, atmosphere,… The GLOBE program at KNMI • Since 2002 at KNMI • Together with SME • Aerosol Optical Thickness (AOT) • Focus on OMI validation • Goals • Education • Science • Public outreach The GLOBE aerosol measurement campaign

  5. LED used as a photo cell: V ~ I 508 nm 625 nm The GLOBE aerosol measurement campaign

  6. Comparison of GLOBE Instrument with Professional instruments Aerosol Optical Thickness at 440 nm The GLOBE aerosol measurement campaign

  7. Measurement campaigns The GLOBE aerosol measurement campaign

  8. Validation • jan-dec 2007 • N = 73 • t < 10 min • CF < 0.1 The GLOBE aerosol measurement campaign

  9. R(508) = 0.68 • R(625) = 0.77 The GLOBE aerosol measurement campaign

  10. The GLOBE aerosol measurement campaign

  11. σ(Gauss) = 0.1  fit result σ(globe) = 0.036 σ(omi) + σ(representativiteit) : 0.09 (= 34%) Comparison with MODIS (over sea) σ(omi) = 30% σ(omi) < 0.09 The GLOBE aerosol measurement campaign

  12. OMI AOT 483 nm MAM 2007 Seasonal cycle Figures by Remco Braak OMI AOT 483 nm SON 2007 The GLOBE aerosol measurement campaign

  13. OMI AOT 483 nm MAM 2007 Seasonal cycle Figures by Remco Braak OMI AOT 483 nm SON 2007 Spring bias (GLOBE-OMI): The GLOBE aerosol measurement campaign

  14. Conclusions • σ(omi) < 0.09 • In spring OMI overestimates AOT • First quantitative validation of OMI AOD with student measurements • Campaign stategy very successful Outlook • Spring and autumn campaign 2008 • Extend with 20 new schools • New approach: combining of two channels • quantitative OMI validation results into (JGR) paper The GLOBE aerosol measurement campaign

  15. Lopussa……. The GLOBE aerosol measurement campaign

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