1 Ozone good & bad. 2 Ozone (parts per million) 0 20 40 60 80 100 Altitude (km) Troposphere Mesosphere Thermosphere Ozone In the Atmosphere Altitude (miles)

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Presentation transcript:

1 Ozone good & bad

2 Ozone (parts per million) Altitude (km) Troposphere Mesosphere Thermosphere Ozone In the Atmosphere Altitude (miles) % of ozone is in the stratosphere % of ozone is in the troposphere

3 UVc - 100% Absorption UVb - 90% Absorption UVa - 50% Absorption & Scattering Ozone is the Earths natural sunscreen Ozone (parts per million) Altitude (km) Troposphere Mesosphere Thermosphere Altitude (miles)

4 Chemicals that Destroy Stratospheric Ozone Cl is much more abundant than Br Br is about 50 times more effective at O 3 destruction From Ozone FAQ - see

5 October Average Ozone Hole Low Ozone High Ozone

NO x NMVOCs NO x NMVOCs CONTINENT 2 OCEAN O3O3 Boundary layer (0-2.5 km) Free Troposphere CONTINENT 1 Tropospheric ozone links air pollution & climate change (1) primary constituent of smog in surface air [NRC, 1991] (2) 3 rd most important greenhouse gas [IPCC, 2001] OH HO 2 VOC, CH 4, CO NO NO 2 h O3O3 O3O3 Hemispheric Pollution Direct Intercontinental Transport greenhouse gas air pollution (smog)