mt #2 Flashcards
radiative forcing
measurement of the capacity of gas or other forcing agents to affect the energy balance
positive values of radiative forcing
results in the heating of the surface
negative values of radiative forcing
results in the cooling of the surface
decrease in stratospheric ozone is an example of an
anthropogenic forcing
aerosols
microscopic or liquid particles suspended in the atmosphere (size from about 0.01 to 10 micrometers) (e.g. dust, smoke, salt)
direct effect of aerosols
- reflect shortwave radiation
- absorb shortwave radiation
- absorb longwave radiation
NET cooling effect
indirect effects of aerosols
- decrease in droplet size, brighter cloud
- reduced cloud droplet sizes, decrease in precipitation, longer lasting, thicker cloud
Natural Sources of Aerosols
land (dust), Ocean (salt), Volcanic eruptions (smoke)
Anthropogenic sources of Aerosols
factories, cars, power plants, deforestation
3 types of aerosols
- sulfate
- black carbon
- organic carbon
Sulfate Aerosols
- cooling, negative radiative forcing effect
- natural source: volcanoes
- Anthro source: burning of fossil fuels
- 90% is anthropogenic
- reflect solar radiation
Black Carbon Aerosols
- warming effect
- natural source: biomass burning (forest fires)
- anthropogenic sources: incomplete combustion from coal diesel engines, biomass burning (deforestation)
- elemental carbon/soot
- absorbs solar radiation, low albedo
Organic carbon
- cooling effect
- natural source: biomass burning
- anthropogenic source: fossil fuel burning, deforestation
climate model
a mathematical representation of the physical processes that control climate
factors effecting emissions
- global population
- energy generation
- economic growth
- type of economy
- cooperation among countries