1Chapter 14: The Changing Climate Detecting Climate ChangeNatural Causes of Climate ChangeAnthropogenic Causes of Climate ChangePossible Consequences of Global WarmingNYCClimate•More than just ‘average weather’•Extreme events & probability•Sum of all statistical weather information describing a place or regionElements of WAC1.Temperature of Air2.Humidity of Air3.Cloud Cover (type and amount)4.Precipitation (type and amount)5.Air Pressure6.Wind Speed and DirectionThe Climate SystemEarth’s four spheres1. Lithosphere2. Atmosphere3. Hydrosphere4. BiosphereClimate 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 1980sMeasuring Climate Change-Seafloor sediments-Oxygen isotope ratios-Old Soils-Tree Rings: Dendrochronology-Historical documentsSea-Floor SedimentsOrganisms at the surfaceBalance between ocean surface waters and the atmosphereAs climate changes so does the composition of the surface organismsRecorded in sediments as the organisms die
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