GEOG 1112 Notes 1

GEOG 1112 Notes 1 - lifetimes) changes hemispheric...

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Geography August 18, 2006 Introduction to Weather and Climate -The atmosphere is a mixture of gas molecules, suspended particles, and falling precipitation in an envelope surrounding the earth -The atmosphere strongly affects our day-to-day lives -Suspended particles allow precipitation to fall -Sports, transportation, attire, human health, agriculture and housing are all affected by the atmosphere -Meteorology – study of the atmosphere and the processes that cause “weather” -Climatology – examines weather elements over long periods -The source of all weather is the sun -Causes of the earth’s season: orbital alignment to the sun = seasonal variations in solar energy; revolution = the ecliptic plane; perihelion (January 3, 147 million km); aphelion (July 3, 153 million km); seasonal radiation variations = ~7%; earth receives about 7% less sunlight in July than in January -Earth rotation – once every 24 hours; rotational axis offset by 23.5º - axis is fixed (over our
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Unformatted text preview: lifetimes) changes hemispheric orientation through orbit and causes seasons-Solstices maximum axial tilt in relation to the sun (June and December); hemisphere axes inclined toward or away from sun causes maximum or minimum solar radiation receipt-Subsolar point (where sun is directly over head) occurs at the declination-Solar angle radiation is proportional to solar angle higher angles equal reduced beam spreading which equals greater heating-Period of daylight circle of illumination unequally bisects latitudes day length changes across latitudes (everywhere gets 12 hours day/ 12 hours night on equinox)-Beam depletion (attenuation) solar radiation diminished is relative to the path length (high solar angles = small energy reductions)-changes in energy receipt with latitude winter hemisphere = energy deficits; summer hemisphere = energy surplus-lower angles = increased path lengths...
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