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Chapter 23 The Atmosphere, Climate, and Global Warming.

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Presentation on theme: "Chapter 23 The Atmosphere, Climate, and Global Warming."— Presentation transcript:

1 Chapter 23 The Atmosphere, Climate, and Global Warming

2 Videos Layers of the atmosphere, sorry, a bit boring, but all the info you need here.Layers of the atmosphere Greenhouse effect Global Warming

3 The Atmosphere The thin layer of glass that envelops the Earth Chemical reactions Atmospheric circulation produces weather and climates

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6 Climate Climate: –the representative or characteristic atmospheric conditions for a region on Earth Microclimate –The climate of a very small local area Urban Dust Dome –Polluted urban air produced by the combination of lingering air and abundance of particulates and other pollutants in the urban air mass

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8 Climatic Change Major climatic changes have occurred during the past 2 million years Appearances and retreats of glaciers During the past 100 years, the mean global annual temperature ahs increased by.5 degrees Celsius

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17 Global Warming A natural or human induced increase in the average global temperature of the atmosphere near the earth’s surface 4 factors –Amount of sunlight Earth receives –Amount of sunlight Earth reflects –Retention of heat by atmosphere –Evaporation and condensation of water vapor

18 Electromagnetic Radiation and Earth’s Energy Balance Electromagnetic spectrum –The collection of all possible wavelengths of electromagnetic energy, considered a continuous range

19 The Greenhouse Effect Greenhouse Effect –The process of trapping heat in the atmosphere –Water vapor and several other gases warm the Earth’s atmosphere because they absorb and emit radiation Greenhouse Gasses –Gasses that have a greenhouse effect –Water vapor, carbon dioxide, methane, CFCs

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24 Global Warming Negative and Positive feedback cycles affect the atmosphere Increase in emission of greenhouse gasses Solar Forcing, Natural Cycles, Aerosols (global dimming), Volcanic Eruptions, El Nino

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28 Effects of Global Warming Changes in climatic patterns Rise in sea level Changes in biosphere

29 Global Climate Patterns Earth’s global climate patterns –Are determined largely by the input of solar energy and the planet’s movement in space

30 Sunlight intensity –Plays a major part in determining the Earth’s climate patterns Figure Low angle of incoming sunlight Sunlight directly overhead Low angle of incoming sunlight North Pole 60  N 30  N Tropic of Cancer 0  (equator) 30  S 60  S Atmosphere LALITUDINAL VARIATION IN SUNLIGHT INTENSITY Tropic of Capricorn South pole

31 Figure June solstice: Northern Hemisphere tilts toward sun; summer begins in Northern Hemisphere; winter begins in Southern Hemisphere. March equinox: Equator faces sun directly; neither pole tilts toward sun; all regions on Earth experience 12 hours of daylight and 12 hours of darkness. 60  N 30  N 0  (equator) 30  S Constant tilt of 23.5  September equinox: Equator faces sun directly; neither pole tilts toward sun; all regions on Earth experience 12 hours of daylight and 12 hours of darkness. December solstice: Northern Hemisphere tilts away from sun; winter begins in Northern Hemisphere; summer begins in Southern Hemisphere. SEASONAL VARIATION IN SUNLIGHT INTENSITY

32 Descending dry air absorbs moisture Ascending moist air releases moisture Descending dry air absorbs moisture 30  23.5  00 30  Arid zone Tropics Arid zone 60  N 30  N 0  (equator) 30  S 60  S GLOBAL AIR CIRCULATION AND PRECIPITATION PATTERNS Air circulation and wind patterns –Play major parts in determining the Earth’s climate patterns Figure 50.10

33 GLOBAL WIND PATTERNS Westerlies Northeast trades Doldrums Southeast trades Westerlies Antarctic Circle 60  S 30  S 00 (equator) 30  N 60  N Arctic Circle Figure 50.10

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35 Adjustments to Global Warming Evidence based decision-making??? Mitigate warming through reduction of greenhouse gasses Energy conservation Alternative energy sources Danger: rapid climatic change

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37 Antarctic Heat Sink

38 Not always that easy to understand… Ice levels don’t always decrease neatly with AGWIce levels don’t always decrease neatly with AGW Check this out as well.this out


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