1. Polar Ozone: Stratosphere- Troposphere Coupling and recent Changes 16.01.08 Proseminar Presentation Techniques Axel Behrendt

2. Contents Part A: Stratosphere-Troposphere Coupling Part B: Recent Polar Ozone Changes 1.Radiation 2.Dynamics 3.Composition of the Stratosphere 4.Impact on Climate 1.Antarctic Ozone Hole 2002 2.Polar Ozone Trends 1/13

3. 1. Radiation Part A: Stratosphere-Troposphere Coupling Increase of Greenhouse Gases 2/13 http:// www.usgcrp.gov Gas Phase Reactions slow down More PSCs

4. 1. Radiation http://www.solcomhouse.com 11-Year Sun-Cycle 3/13 Part A: Stratosphere-Troposphere Coupling Meridional temperature gradient is modified Brewer Dobson Circu- lation is modified

5. 2. Dynamics http://www.atmosphere.mpg.de Stratosphere-Troposphere-ExchangeBrewer Dobson Circulation http://www.ccpo.odu.edu 4/13 Part A: Stratosphere-Troposphere Coupling

6. 2. Dynamics Quasi Biennial Oscillation http://www.nwra.com 5/13 Part A: Stratosphere-Troposphere Coupling

7. 2. Dynamics Chemical Composition of the Troposphere: Long lived species: CH 4, N 2 O, CFCs, COS, … Short lived species: SO 2 DMS 6/13 Part A: Stratosphere-Troposphere Coupling

8. 3. Composition of the Stratosphere Stratospheric Aerosols (SO 2, COS from volcanoes) 7/13 Part A: Stratosphere-Troposphere Coupling Stratospheric Water Vapor From: WMO-Report 2007

9. 4. Impact on Climate 500 hPa Geopotential Height [m] Surface Temp. [K] and Winds 8/13 Part A: Stratosphere-Troposphere Coupling From: WMO-Report 2007

10. Part B: Recent Polar Ozone Changes 9/13

11. Part B: Recent Polar Ozone Changes 1. The Antarctic Ozone Hole 2002 http://www.nasa.gov 10/13 From: WMO-Report 2007

12. 2. Polar Ozone Trends Antarctic: http://www.classzone.comhttp://www.physicalgeography.net 11/13 Part B: Recent Polar Ozone Changes

13. 2. Polar Ozone Trends 12/13 Part B: Recent Polar Ozone Changes http://www.acia.uaf.edu/

14. Thanks for your attention !! 13/13