Lec13_Greenhouse_CO2_POST

Lec13_Greenhouse_CO2_POST - Lecture 13 The Greenhouse...

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Lecture 13: The Greenhouse Effect and the Role of CO 2 CHEM/ENVS 380, March 25, 2010 Fig. 1. Time series of departures from the 1961 to 1990 base period for an annual mean global temperature of 14.0°C (bars) and for a carbon dioxide mean of 334 ppmv (solid curve) during the base period, using data from ice cores and (after 1958) from Mauna Loa ( 4 ). The global average surface heating approximates that of carbon dioxide increases, because of the cancellation of aerosols and other greenhouse gas effects, but this does not apply regionally ( 2 ). Many other factors (such as the effects of volcanic eruptions and solar irradiance changes) are also important. Karl and Trenberth (2003) Modern global climate change, Science , 302: 1719-1723. 1963: Mt. Agung 1991 Mt. Pinatubo 1. What is the greenhouse effect, and how does it work? 2. Is the current atmosphere “normal” with respect to GHG concentrations? 3. Be able to identify major GHGs. 1. What is the atmospheric window? 2. What happens to anthropogenic CO 2 after emission into the atmosphere? What is the “missing sink”?
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Houghton JT et al. (2001) Climate Change 2001: The Scientific Basis, IPCC Third Assessment Report. http://www.ipcc.ch/
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Houghton JT et al. (2001) Climate Change 2001: The Scientific Basis, IPCC Third Assessment Report.
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2. U. Siegenthaler et al., Science, 310, 1313 (2005). 3. R. Spahni et al., Science,
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Lec13_Greenhouse_CO2_POST - Lecture 13 The Greenhouse...

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