Polar Ozone: Stratosphere-Troposphere Coupling and recent

Changes

16.01.08

Proseminar Presentation Techniques Axel Behrendt

Contents

Part A: Stratosphere-Troposphere Coupling

Part B: Recent Polar Ozone Changes

1. Radiation2. Dynamics3. Composition of the Stratosphere4. Impact on Climate

1. Antarctic Ozone Hole 20022. Polar Ozone Trends

1/13

1. Radiation

Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

Increase of Greenhouse Gases

2/13

http:// www.usgcrp.gov

• Gas Phase Reactions

slow down

• More PSCs

1. Radiation

http://www.solcomhouse.com

11-Year Sun-Cycle

3/13Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

Meridional temperature gradient is modified

Brewer Dobson Circu- lation is modified

2. Dynamics

http://www.atmosphere.mpg.de

Stratosphere-Troposphere-ExchangeBrewer Dobson Circulation

http://www.ccpo.odu.edu

4/13Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

2. DynamicsQuasi Biennial Oscillation

http://www.nwra.com

5/13Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

2. Dynamics

Chemical Composition of the Troposphere:

• Long lived species: CH4, N2O, CFCs, COS, …

• Short lived species: SO2 DMS

6/13Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

3. Composition of the Stratosphere

Stratospheric Aerosols (SO2, COS from volcanoes)

7/13Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

Stratospheric Water Vapor

From: WMO-Report 2007

4. Impact on Climate

500 hPa Geopotential Height [m]

Surface Temp. [K] and Winds

8/13Part A: Stratosphere-Troposphere CouplingPart A: Stratosphere-Troposphere Coupling

From: WMO-Report 2007

Part B:

Recent Polar Ozone Changes

9/13

Part B: Recent Polar Ozone ChangesPart B: Recent Polar Ozone Changes

1. The Antarctic Ozone Hole 2002

http://www.nasa.gov

10/13

From: WMO-Report 2007

2. Polar Ozone Trends

Antarctic:

http://www.classzone.com

http://www.physicalgeography.net

11/13Part B: Recent Polar Ozone ChangesPart B: Recent Polar Ozone Changes

2. Polar Ozone Trends

12/13Part B: Recent Polar Ozone ChangesPart B: Recent Polar Ozone Changes

http://www.acia.uaf.edu/

Thanks for your attention !!

13/13