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Lidar Measurements During INTEX-B

Lidar Measurements During INTEX-B. Thomas J. Duck Department of Physics and Atmospheric Science Dalhousie University. Atmospheric-Optics Laboratory http://aolab.phys.dal.ca/. At Pemberton Helicopters. Helping Hands. Operations at Twilight. INTEX-B Measurements Summary.

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Lidar Measurements During INTEX-B

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  1. Lidar Measurements During INTEX-B Thomas J. Duck Department of Physics and Atmospheric Science Dalhousie University Atmospheric-Optics Laboratory http://aolab.phys.dal.ca/

  2. At Pemberton Helicopters

  3. Helping Hands

  4. Operations at Twilight

  5. INTEX-B Measurements Summary • 11 May 2006, 01-11 UTC • 14 May 2006, 01-09 UTC • 15 May 2006, 02-16 UTC • 16 May 2006, 0400-0435 UTC • 16 May 2006, 0640-1830 UTC • 17 May 2006, 03-10 UTC • 17 May 2006, 1700-1930 UTC

  6. Lidar Backscatter Ratio (R) • Ratio of total to molecular signal • Clear air: R=1 • Typical aerosol pollution: 2<R<5 • Clouds R>10 • Can be formed using either: • molecular channel of lidar • radiosonde density profile

  7. CLOUDS AEROSOLS

  8. THIN COULDS AND AEROSOLS? AEROSOLS

  9. AEROSOLS SIGNAL INDUCED NOISE?

  10. CLOUDS AEROSOLS NOTE SHORT TIME INTERVAL

  11. HIGH ALTITUDE AEROSOLS

  12. HIGH ALTITUDE AEROSOLS (AGAIN!) THIN CLOUDS AEROSOLS

  13. CLOUDS AEROSOLS

  14. Data Issues • Products: • aerosol/molecular backscatter ratio • can convert to backscattering cross-section • aerosol extinction • aerosols are too optically thin for this • can estimate given assumption of lidar ratio • Signal-induced noise • need to apply correction to get lower altitudes

  15. Some Context: Alaskan Smoke over NS during ICARTT 11/12 July 2004

  16. FLEXPART Column Retroplume (for measurement on next day)

  17. FLEXPART Footprint

  18. Lidar/Model Comparisons

  19. Next Steps • Refine/improve data products • FLEXPART footprint determination • in collaboration with Andreas Stohl • may provide useful input to GEOS-Chem work • Use AMS info for lidar ratio estimate (?) • Comparisons with sondes, Met charts • reasons for constant descent? • water vapour impact?

  20. The End Thomas J. Duck <tom.duck@dal.ca> Atmospheric-Optics Laboratory http://aolab.phys.dal.ca/

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