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Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka

ARC-IONS. ARC-IONS Workshop 7-8 January 2009. Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka. M. Osman, W. Hocking, D.Tarasick, J.Drummond. University of Western Ontario Environment Canada University of Dalhousie. ARC-IONS. Outline.

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Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka

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  1. ARC-IONS ARC-IONS Workshop 7-8 January 2009 Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka M. Osman, W. Hocking, D.Tarasick, J.Drummond University of Western Ontario Environment Canada University of Dalhousie

  2. ARC-IONS Outline • Background and Motivation • Methods • Results • Future Work

  3. ARC-IONS Background and Motivation • Health issues • Economic issues- crop production • Global warming • Photochemistry is the major source of ozone in the lower troposphere • The stratosphere–troposphere exchange of ozone

  4. ARC-IONS Detection of Ozone intrusion Simultaneous radar and ozonesonde measurements from the Montreal Campaign of April–May 2005 Source: Hocking et al. (2007)-NATURE • This talk examines the detection of stratospheric ozone leakage from the stratosphere to the troposphere • Particularly highlighting noticeable differences between February-March and April

  5. ARC-IONS Methods • Ozonesondes combined with windprofiler radars • Radar analysis software and MATLAB Windprofiler radar at Eureka 1Ozone sensor Styrofoam casing 2 Radiosonde 3 Ozonesonde Interface Board OIF11 4 Ozone sensor

  6. Results ARC-IONS Ozone campaign 24 Feb – 18 April 2008 Eureka • Ozone variation with height • Time series of ozone concentration between ground & 0.5km as well as 0.5km & 1.0km

  7. Ozone plot ARC-IONS • Red transition to softer colors …noticeable High gradients of ozone Sharp cut off Smeared out A lot more ozone in the upper and middle troposphere

  8. ARC-IONS Motivated questions… • Was the difference due to ozone concentration just above the tropopause? • Was it stratospheric ozone? • What happened to tropopause during those periods of time? • Wind and turbulence strengths

  9. Was the leakage due to high concentration of ozone immediately above the tropopause ? ARC-IONS No!

  10. ARC-IONS Was the ozone really stratospheric? • Low RH used as a partial indicator of ozone originated from stratosphere • Weak gradients of ozone • Low humidity…

  11. ARC-IONS Smoothed humidity…

  12. ARC-IONS Ozone & Humidity … High tropospheric ozone Lowhumidity? Is there a correlation?

  13. ARC-IONS Smoothed one…

  14. ARC-IONS Was the tropopause poorly defined? Gradient of temperature around tropopause is not that weak in Feb – Mar…

  15. ARC-IONS Cont… Gradient of temperature around tropopause is not that weak…

  16. ARC-IONS Turbulence No obvious distinction between the two periods!

  17. Proxy for gravity wave ARC-IONS SD of vertical component of wind Nothing distinct statistically between the two periods!

  18. ARC-IONS Vertical Wind (1-5km) No obvious difference between the two periods!

  19. ARC-IONS Vertical Wind (5-10km) No difference!

  20. ARC-IONS Horizontal Wind (1 – 5km)

  21. ARC-IONS Horizontal Wind (5 – 10km) During April 1–13 the wind was blowing northward!

  22. ARC-IONS Daily Horizontal Wind (1 – 5km)

  23. ARC-IONS Daily Horizontal Wind (5 – 10km) • During the 1st two weeks of April northward blowing wind quite dominant

  24. ARC-IONS Future Work • To further analyze the wind and turbulent strengths • To simulate the situation using FLEXPART • To run photochemical models like GEM-MACH • To apply the same procedure for other radar stations and campaigns

  25. Thank you! Acknowledgements • Prof. Wayne Hocking • Prof. David Tarasick • University of Western Ontario • Environment Canada • ARC-IONS

  26. ARC-IONS Horizontal Wind (5 – 10km)

  27. ARC-IONS Daily Horizontal Wind (5 – 10km) • From 04/01 – 04/13 the wind was blowing northward

  28. Turbulence 5 - 10km ARC-IONS

  29. Turbulence up to 15km ARC-IONS

  30. ARC-IONS Horizontal Wind (1 – 5km) Although it isn’t quite dominant the wind was blowing northward!

  31. ARC-IONS Daily Horizontal Wind (1 – 5km) The wind was blowing northward!

  32. ARC-IONS Vertical Wind (1-5km)

  33. ARC-IONS Vertical Wind (5-10km)

  34. ARC-IONS Vertical Wind (1-10km)

  35. ARC-IONS

  36. ARC-IONS Horizontal Wind (1 – 10km)

  37. ARC-IONS

  38. ARC-IONS Daily Horizontal Wind (1 – 10km)

  39. ARC-IONS

  40. ARC-IONS Horizontal Wind • From 04/01 – 04/13 the wind was blowing northward

  41. ARC-IONS Horizontal Wind… • During the 1st two weeks April northward blowing wind quite dominant • Before coming to conclusion we need to look at in more detail

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