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Chapter 2

enviro sci chapter 2.odt

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McMaster University
Environmental Science
Luc Bernier

Variations of Surface Temperature -Earth revolves around Sun in ecliptic plane known as revolution -closet to sun in january, point known as perihelion -furthest in july, point known as aphelion – earth's axis is offset 23.5 from perpendicular plane (plane of ecliptic) – circle of illumination: separates portion of earth that is light or dark – june solstice: longest day of the year, subsolar point at 23.5 degrees north of tropic of cancer subsolar point: angle of sun's ray and earth's surface is 90 degrees 24 hour daylight in arctic circle -december solstice: shortest day in northern hemisphere subsolar point is at 23.5 degrees south of tropic of capricorn, 24 hr daylight in antarctic circle Equinox: subsolar point is at equator, 12 hr daylight everywhere, circle of illumination touches both poles -daily insolation of Sun: angle at which Sun hit the earth's surface, and how long the sun is over the surface subarctic zone: extremely large variations in daylight, covered in evergreens midlatitude zone: differences in daylight are large, seasonal contrast tropical zone: home to world's driest dessert, high annual insolation, no seasonal contrast equatorial zone: no seasonal cycle,
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