GEOG 1112 Notes 3

GEOG 1112 Notes 3 - Geography Methane(CH4-A variable gas in...

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Geography August 25, 2006 Methane (CH 4 ) -A variable gas in small but recently increasing concentrations -Increases from burning of fossil fuels, livestock digestion, and agriculture cultivation (especially rice) -Effective absorber of terrestrial radiation (greenhouse gas) – plays a role in near-surface warming Aerosols (Particulates) -Any solid and/or liquid particle, other than water -Both natural (sea spray, dust, combustion) and human (combustion) sources -Long residence times for some types -Acts as condensation nuclei Vertical Structure of the Atmosphere -Density – mass (kg) per unit volume (m 3 ); sea level average is 1.2 kg/m 3 -Near surface air is denser; compressibility relates to density -Mean free path at surface is .0001 mm; at 150 km is 10m Thermal Layers of Atmosphere -Four distinct atmospheric layers 1. Troposphere 2. Stratosphere 3. Mesosphere 4. Thermosphere -Each has particular temperature characteristics with height Troposphere -Lowest layer -Steady temperature decrease with height (-6.5ºC/km)
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