1. THE GREENHOUSE EFFECT
© 2016 Paul Billiet ODWS

2. Sunlight energy in the atmosphere
© 2016 Paul Billiet ODWS

3. The layers of the atmosphere
The troposphere is the atmospheric part of the biosphere
The stratosphere contains the ozone layer
The stratosphere is also a zone of warm air that keeps a lid on the troposphere.
The troposphere does not mix with the upper atmosphere
© 2016 Paul Billiet ODWS

4. The Greenhouse Effect
© 2016 Paul Billiet ODWS

5. The Greenhouse Effect
The molecules of some gases in the atmosphere absorb heat energy and retain it
This can be a good thing
Without an atmosphere the Earth would have same temperature as the moon
Moon mean surface temperature = -46°C
Moon temperature range = -233°C to +123°C
© 2016 Paul Billiet ODWS

6. The Greenhouse Gases H2O vapour CO2 CH4 NOx CFC
© 2016 Paul Billiet ODWS

7. Infrared Absorption Spectra
© 2016 Paul Billiet ODWS

8. The Greenhouse Gases Water vapour in the atmosphere is stable
The atmosphere is saturated
CO2 levels are currently rising
They have varied in the past
Methane levels are increasing: as more cattle are farmed, as more paddy fields are planted, as permafrost melts
NOx levels increase due to increased circulation of motor vehicles.
© 2016 Paul Billiet ODWS