Presentation on theme: "Atmosphere Layers separated by temperature variations. 1. Troposphere: 0-12 km -- where we live -- gets colder as you go up. -- all weather occurs here."— Presentation transcript:
Atmosphere Layers separated by temperature variations. 1. Troposphere: 0-12 km -- where we live -- gets colder as you go up. -- all weather occurs here. -- all water vapor occurs here.
Atmosphere 2.Stratosphere: km -- ozone layer --ozone absorbs short-wave (dangerous) radiation. --temperature gets warmer as you go up.
Annual Maximum Ozone Hole
Atmosphere 3.Mesosphere: km -- gets cold again as you go up. -- air is very thin. 4.Thermosphere: km -- gets warmer as you go up. -- last layer
Greenhouse Effect Atmosphere holds in heat radiated from Earth. - keeps Earth warm for us. Greenhouse Gas = chemical compound that allows short-wave radiation in, but, absorbs outgoing long-wave radiation (infrared/heat).
Greenhouse Gases 1.Water vapor - most abundant (largest amount). 2.Carbon dioxide (CO 2 ) - natural (plants) and man-made (oil and gas). 3.Methane (best absorber), CFCs (aerosol sprays…stay 100 years in atmosphere).
Greenhouse effect Increasing greenhouse gases trap more heat
Carbon Dioxide Carbon Dioxide (CO 2 ) levels historically precede and/or follow temperature rises. How do we know? Ice cores from Antarctica… 450,000 year record.
Natural CO 2 Range
Aspen, CO Forecast: Partly cloudy today High : 28°F Low: 13°F Increasing clouds over night. Colder tomorrow.
Why Should We Care?
Climate Climate = characteristic weather of a region. Ex. 100 year pattern. Major Elements: Temperature Precipitation (Moisture)
Problems Climate change = warmer, drier, wetter, more extreme weather. 3 to 7 feet rise in sea levels by end of century. Arctic temperature rising faster than others. Glacier melting = too much fresh water.