Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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Presentation transcript:

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

Outline  Background and Motivation  Methods  Results  Future Work ARC-IONS

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

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

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

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

 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 Motivated questions… ARC-IONS

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

Smoothed humidity… ARC-IONS

Ozone & Humidity … Low humidity? Is there a correlation? High tropospheric ozone ARC-IONS

Smoothed one… ARC-IONS

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

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

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

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

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

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

Horizontal Wind (1 – 5km) ARC-IONS

Horizontal Wind (5 – 10km) During April 1–13 the wind was blowing northward!

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

Daily Horizontal Wind (5 – 10km) During the 1 st two weeks of April northward blowing wind quite dominant

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 ARC-IONS

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

Horizontal Wind (5 – 10km) ARC-IONS

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

Turbulence km ARC-IONS

Turbulence up to 15km ARC-IONS

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

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

Vertical Wind (1-5km) ARC-IONS

Vertical Wind (5-10km) ARC-IONS

Vertical Wind (1-10km) ARC-IONS

Horizontal Wind (1 – 10km) ARC-IONS

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

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

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