SCIE 1P50 Lecture 7: SCIE 1P50 Lecture 7.5, 8, 8.5, 9 - climate change
3 Dec 2015
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Document Summary
Global climate change = describes trends and variations in earth"s climate (ie. temperature, precipitation, etc) The sun and atmosphere keep earth warm the planet absorbs solar radiation google diagram on how. As the earth"s surface absorbs solar radiation, the surface increases in temperature and emits infra-red radiation (heat?) Greenhouse gases: atmospheric gases that absorb the infra-red radiation = including water vapor (h2o), ozone (o3), co2 of most. Concern , nitrous oxide (n2o), methane (ch4) component of permafrost. Each gas differs in their ability to warm the surface and troposphere. After absorbing the radiation, greenhouse gases re-emit infra-red energy some of it is lost to space. Greenhouse effect = some energy travels back downward, warming the troposphere and the surface. 310, being extremely more potent that carbon dioxide volume of co2 makes it more dangerous than n2o. Residence time = the amount of time a gas stays in the atmosphere ex: co2 100 yrs.
