GSU GEOG 1112 - Geo_9e_Lecture_Ch03 (32 pages)

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Chapter 3 Lecture Geosystems 9th Edition Earth s Modern Atmosphere 2015 Pearson Education Inc Learning Objectives Draw a diagram showing atmospheric structure based on three criteria for analysis composition temperature and function List and describe the components of the modern atmosphere giving their relative percentage contributions by volume Describe conditions within the stratosphere specifically review the function and status of the ozonosphere or ozone layer Distinguish between natural and anthropogenic pollutants in the lower atmosphere Construct a simple diagram illustrating the pollution from photochemical reactions in motor vehicle exhaust Describe the sources and effects of industrial smog 2015 Pearson Education Inc The history of the atmosphere H2 He2 H2O 80 CO2 10 N2 10 N2 N2 78 O2 21 Others 1 Time The First Atmosphere 4 6 billion years ago The Second Atmosphere 3 5 billion years ago The Fourth Atmosphere The Modern Atmosphere The Third Atmosphere 1 7 billion years ago 2015 Pearson Education Inc Air Permanent Gases N2 78 O2 21 and others 1 Variable gases Water Vapor H2O 0 to 4 CO2 0 0035 4Less Odorless Colorless Tasteless and Formless 2015 Pearson Education Inc How thick is the atmosphere The thickness of the Earth s atmosphere is about 480km Thermopause Beyond that altitude is the exosphere outer sphere 2015 Pearson Education Inc Air Density Air density 1 2 kg m3 Liquid water density 1000kg m3 2015 Pearson Education Inc Air Density Profile Air density decreases with increase of altitude 2015 Pearson Education Inc Atmospheric Pressure Profile 2015 Pearson Education Inc Atmospheric Composition Profile Heterosphere 80km 480km Distinct layers due to gravity H2 He2 at the top of heterosphere N2 O2 in the lower heterosphere Homosphere 0 80km Uniformly mixed except for Ozone O3 Ozone in the Ozone layer 19km 50km 2015 Pearson Education Inc Components of the Homosphere 2015 Pearson Education Inc Atmospheric Temperature Profile Troposphere Stratosphere