climate and AQ

climate and AQ - 3/22/11 Air Quality and Climate Change...

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3/22/11 1 Air Quality and Climate Change GEOG 371 March 17 th , 2011
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3/22/11 2 What is climate change? IPCC, AR4 IPCC ± http://www.ipcc.ch/ ± First report (FAR) – 1990 ± Second report (SAR)– 1995 ± Third (TAR)– 2001 ± Foruth (AR4)- 2007
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3/22/11 3 IPCC, AR4 2007 Conclusions Warming of the climate system is unequivocal Very high confdence that global average net eFect of human ac=vi=es since 1750 one of warming Human-caused warming over last 30 years has likely had a visible influence on many physical and biological systems Con=nued GHG emissions at or above current rates would cause further warming and induce many changes in the global climate system during the 21 st century that would very likely be larger than those observed during the 20 th century. z
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3/22/11 4 The temperature records IPCC, AR4 What changes climate? ± Changes in: ± Sun’s output ± Earth’s orbit ± DriNing con=nents ± Volcanic erup=ons ± Greenhouse gases
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3/22/11 5 l Greenhouse efect z Increasing greenhouse gases trap more heat Greenhouse gases Nitrous oxide Water Carbon dioxide
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climate and AQ - 3/22/11 Air Quality and Climate Change...

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