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ENV200H1 (60)
Karen Ing (49)
Lecture 7

lecture 7 env 200 jan 31.docx

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School of Environment
Karen Ing

Lecture 7 env 200 jan 31  Tutorial questions o What was the avg 2.7 global we have 7.1  The sun and latitude o Sun does not reach all places uniformly o The same amount of energy spread over a larger area, cannot heat to the same extent  As a general rule: the tilt of the earth axis means that more heat is absorbed near the equator and progressively less towards the poles (although this varies by season)  If ur near the equator you don’t have great temperature differences for each season, you might have wet or dry season this is because the earth is tilted on its axis o Inclination on its axis determines earth’s seasons o North and south hemispheres are opposite o The orbit doesn’t change very much its because of the tilt of the earth that changes its season  The atmosphere o Temperatures difference drive circulation we see in the earth o And it its continuous circulation moderates surface temperature on earth o As air cools (and condenses) its density increases and falls slowly back to earth  1. Sun heats ground surface  2. From this the warm ground heats the air above it  3. As air warms it becomes less dense and heat rises upward  4. As it rises it looses heat because it gets cooler  5. Air is pushed aside toward low pressure area, as it sink its pushing the air aside, like dropping a cloud  6. Cool dense air sinks to low pressure air area
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