Geog. 111 Notes 15

Geog. 111 Notes 15 - -contemporary climate change: -the...

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- contemporary climate change: -the clues: observational data, weather stations, satellites, weather balloons, radar, models (re-analysis) -the processes: ocean/ atmosphere, volcanoes, solar output?, anthropogenic (man-made) -Intergovernmental Panel on Climate Change, IPCC: assesses all aspects and impacts of climate change, proposes new strategies and behavioral changes; three working projects (study science behind climate change, projections; impacts, adaptations, vulnerability; policy making group); now focuses almost exclusively on greenhouse gases -recent warming has not been at an ever increasing rate, annual fluctuations (most serious warming trend is one that started in 1970’s) -it hasn’t been warming the same everywhere (from 1901 to 2005 North Atlantic and Southeast US have actually experienced cooling); annual decrease in snow cover, as well as permafrost melting have contributed to warming in higher latitudes -precipitation data: increases in higher latitudes; however sub-Saharan Africa has seen much decrease in precipitation (most of decrease since 1960’s) -how significant is urban heat island?: increases in use of concrete and metals worldwide; still, urban areas cover low percentage of area in the world; cities have basically no impact on global climate (only
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Geog. 111 Notes 15 - -contemporary climate change: -the...

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