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

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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

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Page 1: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

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Outline

Background and Motivation

Methods

Results

Future Work

ARC-IONS

Page 3: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

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Page 4: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

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Page 5: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

MethodsOzonesondes combined with windprofiler radars

Radar analysis software and MATLAB

1 Ozone sensor Styrofoam casing2 Radiosonde3 Ozonesonde Interface Board OIF114 Ozone sensor

Windprofiler radar at Eureka

ARC-IONS

Page 6: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

ResultsARC-IONS

Page 7: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

Page 8: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

Page 9: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Was the leakage due to high concentration of ozone immediately above the

tropopause ?

No!

ARC-IONS

Page 10: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

Page 11: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Smoothed humidity…ARC-IONS

Page 12: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Ozone & Humidity …

Low humidity?

Is there a correlation?

High tropospheric ozone

ARC-IONS

Page 13: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Smoothed one…ARC-IONS

Page 14: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Was the tropopause poorly defined?

Gradient of temperature around tropopause is not that weak in Feb – Mar…

ARC-IONS

Page 15: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Cont…

Gradient of temperature around tropopause is not that weak…

ARC-IONS

Page 16: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Turbulence

No obvious distinction between the two periods!

ARC-IONS

Page 17: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Proxy for gravity waveSD of vertical component of wind

Nothing distinct statistically between the two periods!

ARC-IONS

Page 18: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS Vertical Wind (1-5km)

No obvious difference between the two periods!

Page 19: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS Vertical Wind (5-10km)

No difference!

Page 20: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Horizontal Wind (1 – 5km)ARC-IONS

Page 21: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS Horizontal Wind (5 – 10km)

During April 1–13 the wind was blowing northward!

Page 22: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

Page 23: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS Daily Horizontal Wind (5 – 10km)

During the 1st two weeks of April northward blowing wind quite dominant

Page 24: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

Page 25: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Acknowledgements

Prof. Wayne Hocking

Prof. David Tarasick

University of Western Ontario

Environment Canada

ARC-IONS

Thank you!

Page 26: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Horizontal Wind (5 – 10km)ARC-IONS

Page 27: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Daily Horizontal Wind (5 – 10km)ARC-IONS

From 04/01 – 04/13 the wind was blowing northward

Page 28: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Turbulence 5 - 10kmARC-IONS

Page 29: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Turbulence up to 15kmARC-IONS

Page 30: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS Horizontal Wind (1 – 5km)

Although it isn’t quite dominant the wind was blowing northward!

Page 31: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

The wind was blowing northward!

Page 32: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Vertical Wind (1-5km) ARC-IONS

Page 33: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Vertical Wind (5-10km)ARC-IONS

Page 34: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Vertical Wind (1-10km)ARC-IONS

Page 35: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS

Page 36: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Horizontal Wind (1 – 10km)ARC-IONS

Page 37: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS

Page 38: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

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

Page 39: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

ARC-IONS

Page 40: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Horizontal Wind

From 04/01 – 04/13 the wind was blowing northward

ARC-IONS

Page 41: Stratospheric–Tropospheric Exchange of Ozone during February–April 2008 at Eureka University of Western Ontario Environment Canada University of Dalhousie.

Horizontal Wind…

During the 1st two weeks April northward blowing wind quite dominantBefore coming to conclusion we need to look at in more detail

ARC-IONS


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