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chapter14gh - Chapter 14 The Changing Climate Detecting...

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1 Chapter 14: The Changing Climate Detecting Climate Change Natural Causes of Climate Change Anthropogenic Causes of Climate Change Possible Consequences of Global Warming NYC Climate •More than just ‘average weather’ •Extreme events & probability •Sum of all statistical weather information describing a place or region Elements of WAC 1. Temperature of Air 2. Humidity of Air 3. Cloud Cover (type and amount) 4. Precipitation (type and amount) 5. Air Pressure 6. Wind Speed and Direction The Climate System Earth’s four spheres 1. Lithosphere 2. Atmosphere 3. Hydrosphere 4. Biosphere Climate Change? - Paleo studies show climate varies on every temporal scale -Human activities are changing climate - Recent data indicates climate is becoming more variable -modern record is ~200 years -satellites 1980s Measuring Climate Change - Seafloor sediments -Oxygen isotope ratios - Old Soils -Tree Rings: Dendrochronology -Historical documents Sea-Floor Sediments Organisms at the surface Balance between ocean surface waters and the atmosphere As climate changes so does the composition of the surface organisms Recorded in sediments as the organisms die
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