Bio36_18_ClimateChange - 1 2 3 1 2 4 1 2 5 1 2 6 1 Overview...

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1 Overview • Ch. 18: Global Climate Change – Climate Change Science – Response to Climate Change Hurricanes • Global warming b more hurricanes? – Warmer sea surface temperatures – More water vapor Atmosphere • Troposphere – Biogeochemical cycles temperature – Mixing of air pollutants • Tropopause – Air shifts from cooling to warming • Stratosphere temperature – Ozone • Stratopause – Air shifts from warming to cooling • Meteorology – Study of atmosphere •Weather engine driven by solar energy • Weather • Climate – Long-term weather patterns • Flowing air – Vertical air currents •Convection currents – Horizontal airflows •Replaces rising warm air •Wind • Convection currents – Day-to-day changes in weather • Jet streams – Large scale air movements – Hadley cells + Earth’s rotation • Air masses meeting – Fronts • Monsoons: major seasonal airflows – Reversal of previous wind patterns Global Climate Change • Intergovernmental Panel on Climate Change (IPCC) – Conclusion: warming of the climate system is unequivocal •Atmosphere is warmer •Oceans are warmer •More precipitation 1 2 3 1 2 4 1 2 5 1 2 6 1
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2 •More extreme weather events •Glaciers are melting •Sea level is rising • Risk assessment – Is the climate changing? • Risk management – How can we manage the system? •Mitigation: greenhouse gas (GHG) emissions •Adaptation: adjusting to coming climate changes IPCC 2001 Third Assessment Report • Observations: warming world • Greenhouse gas emissions (e.g., CO 2 • Most warming in the last 50 years is due to human activities Past Climates • Direct measures since 1880 – Warming trends •1910 – 1945 •1976 – present Past Climates Long-Term Changes • Measured with proxies – Historical accounts – Pollen, tree rings, etc. – Ice cores
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This note was uploaded on 01/12/2012 for the course BIOLOGY 36 taught by Professor Teresafinnern during the Fall '11 term at Riverside Community College.

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Bio36_18_ClimateChange - 1 2 3 1 2 4 1 2 5 1 2 6 1 Overview...

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