1024LectureFile17

1024LectureFile17 - Climate Change Hazards Potentially the...

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1 Climate Change Hazards •Potentially the greatest hazard of all. –Sea level changes. –Catastrophic weather. –Desertification. •An apparently controversial topic, as well. –Approaches evolution as a lightning rod.
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2 Climate Basics (1) •Climate is the mean of all Earth surface conditions. –Local variations get averaged out. GJPS, 5th, Figure 21.4, Page 507 GJPS, 5th, Figure 19.0, Page 452
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3 Climate Basics (2) •Climate is the mean of surface conditions over time. –Short-term variations get averaged out. The climate is not the weather . 4 http://www.cavalierdaily.com/?pid=1399 http://www.cfcl.com/vlb/ weblog/archives/2004_02.html http://www.9wsyr.com/news/local/story.aspx? content_id=8adbcb60-ee6d-4c36-b85a-49a90d13fb86
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4 Climate Basics (3) •The climate has changed radically over geologic time. –Ice ages are an example. PSGJ, 4th, Figure 16.24, Page 368 Mo, 7th, Figure 9.30, Page 211 •We have vast data on glacial history. –Poorer understanding of the causes.
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5 Short-Term Climate Variation •Recent work has demonstrated short-period variations in the climate. –Weather is a few days. •These variations are a few months to a few decades. –El Niño/La Niña. –Mini ice ages.
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6 Ke, 8th, Figure 16.C, Page 462 Mo, 7th, Figure 9.40, Page 220 GJPS, 5th, Box 15.2, Page 361
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7 Climate Basics (4) •Long term climate variation controlled (forced) by variety of factors.
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1024LectureFile17 - Climate Change Hazards Potentially the...

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