CHEM-5151_S05_L22_Climate - Lecture 22 Atmospheric...

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1 Required Reading: FP Chapter 14 (only sections that I cover) Suggested Introductory Reading: Jacob Chapter 7 Atmospheric Chemistry CHEM-5151 / ATOC-5151 Spring 2005 Prof. Jose-Luis Jimenez Lecture 22: Atmospheric Chemistry and Climate Introduction Climate: long-term statistical average of weather Lecture Outline A. Radiation balance as driver for climate B. Greenhouse gases C. Aerosols Caveats: Once more, one could teach an entire course on this topic, so we will only cover the main points There is a lot more to Climate Change than atmospheric chemistry! Atmospheric circulation / dynamics, ocean circulation and chemistry, precipitation, sea level, regional differences… But changes in atmospheric chemistry are the driver of CC
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2 IPCC Report • To learn more, see IPCC report – “TAR”, third assessment report – Available online for free • Link on class page “The bible of climate change” – It's big and thick – It was written by a committee – It deals with cataclysmic events such as floods and droughts – No one reads it from cover to cover – You can open it up on any page and find something interesting – It is full of internal contradictions – It has its true believers and its rabid skeptics (from Steve Schwartz, DOE Brookhaven Nat Lab) Another report “FAR” coming in ~2007 Is Climate Change Happening? • IPCC 1995 (SAR) – “The balance of evidence suggests a discernible human influence on global climate” • IPCC 2001 (TAR) – “In the light of new evidence and taking into account the remaining uncertainties, most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations” • Pieter Tans (NOAA) – “with CO 2 increasing by 50% since preindustrial times, I can’t see how someone could think that climate would not have
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CHEM-5151_S05_L22_Climate - Lecture 22 Atmospheric...

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