BIO 200 Lecture Notes - Lecture 25: Pacific Decadal Oscillation, Heat Capacity, Cool Air
18 Dec 2018
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Outline: rays strike at steep angle so more heat per unit area, direct path to earth so shorter distance and more reflection. Heat rises and spreads to n&s of equator. Cool air holds h20 less effectively so condenses to form rain [tropics] Now cool, dry air sinks under high pressure and heats up. Hadley circulation: single loop of falling & rising air repeating around earth. Rising air= rain (lush); sinking air= deserts: angle of earth: 23. 5 tilt causes seasons. Summer= sun above horizon longer and rays strike ground more directly. Seasons magnified away from equator: variation in local conditions: the reason for differences within latitude features. Topography/terrain- landforms aka elevation, slope, orientation to other. Rain in sh- more rainfall in sh than nh: 81% sh in h20 vs 61% nh; Slope and local drought- microclimates: slopes: soil drains down so tops are dry; plants likely drought resistant, base: likely h20 saturated; trees.
