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Lecture25_EAS1600_Fall08

Lecture25_EAS1600_Fall08 - EAS 1600 Lecture 25...

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EAS 1600 Lecture 25 Anthropogenic Climate Change The last two classes we have talked about natural climate variability. This lecture looks at the evidence for anthropogenic climate change.
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A rapid increase in temperature is observed in the past 40 years from thermometer based data. Older data is less accurate but indicates that climate was stable for past 1000 years. based data.
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Temperature is Increasing Is it due to CO 2 ? • CO 2 (and CH 4 , N 2 O, etc.) certainly act as a greenhouse gas to trap energy in the atmosphere • CO 2 levels have increased due to fossil fuel burning. Is the impact of the CO 2 damped by a negative feedback? For example, if CO 2 increases were accompanied by an increase in albedo? http://iri.columbia.edu/climate/ENSO/background/
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Potential Negative Feedback Clouds increase Albedo Pinatubo Albedo has been relatively constant over the last 20 years so incoming radiation is not decreasing.
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