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GEOG 2110L (50)


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GEOG 2110L
David Stanley

WEATHER VS CLIMATE Weather Climate ***day-to-day conditions of the *** the statistical properties of the atmosphere atmosphere, including measures of the average conditions, variability, etc ** constantly changing ** slow long-term changes ** the state or condition of the atmosphere ** a description of aggregate weather at a particular time and place conditions **comprised of various factors: air ** a sum of the daily and seasonal pressure, air temperature, humidity, weather events over decades of years clouds, precipitation, wind, visibility(average of these factors) Meteorology: the science that studies the atmosphere Climatology: the study of long-term atmospheric conditions ORIGIN OF THEATMOSPHERE ORIGIN OF THEATMOSPHERE ORIGIN OF THEATMOSPHERE A B C D --|------------------------------------|------------------------------|-------------------- 4.5 bya 3 - 1.5 bya .5 bya A: earth formed, hot gases escape, degassing B: Earth cooled and gases accumulate; atmosphere comprised of carbon dioxide, nitrogen and methane, BUT NO oxygen or ozone C: O2 generating aquatic organisms evolved, oxygen supply slowly rises D: green plants widespread; atmosphere takes on present conditions; ozone levels increase and spread ** Main process for increased oxygen levels is photosynthesis COMPOSITION OF THEATMOSPHERE ** a mixture of discrete gases with solid and liquid particles suspended in it ** Some components are fairly stable while others vary spatially and temporally ** constant gases (found in same proportions within lower atmosphere) ** variable gases (present in differing amounts spatially and/or temporally) Constant Gases: 3 gases make-up just under 100% of the atmosphere Nitrogen(N): ~ 78% Oxygen(O ):2~ 21% Argon(Ar): ~ .9% Variable Gases: 3 which influence weather and life systems Carbon dioxide(CO ) 2 Water vapor(H O2 Ozone(O ) 3 ** Carbon dioxide: ** Water vapor: quite variable throughout the atmosphere * 4% by volume in tropics to <1% in deserts * source of clouds and precipitation * absorbs radiant ener
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