Global Change_1

Global Change_1 - Earth Earth ’ ’ s Climate and Global...

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Unformatted text preview: Earth Earth ’ ’ s Climate and Global Change s Climate and Global Change ikings colonized Iceland, reenland, and North America uring Medieval Warm Period from 1100-1300 A.D. “Little Ice Age” began in late 300’s A.D. causing ettlements to be abandoned. Abandoned Viking Settlement, Greenland Multiple glacial periods have occurred in the geologic past Iceland Last glacial maximum – 20,000 yr ago Rhone Glacier (Present) Swiss Alps Evidence of warming trend in last century Lithograph of Rhone Glacier from 1850’s Global Climate is reflected in: • Temperature (mean) • Precipitation (rainfall, snowfall) • Seasonal variations Climatic Zones • Distribution • Causes Let’s consider an example : distribution of world’s arid regions Hadley Convection Cell No. and So. Hemispheres Tropic (23°) Rising moist air Descending dry air Equator El Niño Example of a periodic change in regional climate El Niño – Due to coupling of ocean-atmosphere interactions Evidence of Global Climate Change Through Time • Direct measurements and historical records of climate (back to 1800’s; some earlier) • Geologic record of climate (1 million years +) Marine and lake sediments Glacial ice cores Cave deposits • Other records of climate Tree rings Pollen Combined land-surface air and sea surface temperatures (1861-2000) Historical Records Mean global temperature has increased ∼ 0.7 o C over the last 140 years IPCC 2001 Distinguishing short-term fluctuations from longer-term trends...
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This note was uploaded on 05/13/2011 for the course GEO 101 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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Global Change_1 - Earth Earth ’ ’ s Climate and Global...

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