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greenhouse effect
Retention of heat in the troposphere caused by trapping of infrared radiation by greenhouse gases. These gases sorb and redirect some of the IR back to Earth (warming troposphere, hydrosphere and surface)
predominant greenhouse gases on Earth
CO2, CH4
anthropogenic sources of CO2
burning fossil fuels
anthropogenic sources of CH4
landfills, rice paddies, cattle
present concentration of CO2
400 ppm
Preindustrial CO2
200-280 ppm
Anthropogenic
Humankind
Function of stratospheric ozone
Filters most harmful UV radiation (UVc) from reaching Earth
methane is a more potent GHG
Sorbes the fraction of Infrared radiation that is more energetic (a fine point.)
global circulation models (GCM)
describe the circulation of heat in time-forward models