ISP217_Atmosperic_circulation

Combooksearthscienceter 43

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Unformatted text preview: ill fall behind the straight southward direction (in northern hemisphere) since north moving slower than south. 40 Coriolis Effect: From Buffalo Earth spinning: object moving south to equator “falls behind” and veers west 41 Coriolis Effect: From Quito Earth spinning: object moving north from equator veers east 42 Video Link http://www.classzone.com/books/earth_science/ter 43 As air moves from south to north in the northern hemisphere, it is deflected to the east by the Coriolis effect. As air moves from north to south in the southern hemisphere, it is deflected to the east by the Coriolis effect. 44 Theoretical model of wind…if earth did not rotate. Because of Coriolis effect, this is not what happens. 45 3 cell model of atmospheric circulation Air moving up low pressure Solid lines -Little air movement Windy between solid lines Air moving down high pressure 46 3 cell model of atmospheric circulation Just another picture 47 Theoretical vs. Actual Large reason for difference: Land mass effects. 48 Effect of wind patterns on climate: At the equator (0°) and 60°N and 60°S: Rising air cools and the moisture in it wrings out as clouds and rain • A belt of wet climate occurs • Pressure is low At 30° N and S and at each pole: Falling air warms, and sucks moisture into it like a sponge • A belt of dry climate, deserts, occurs. • Pressure is high Note how dry and wet alternate every 30°. 49 50 Deserts of the World 30° 0° 30° 51 Horse latitude Doldrums Horse latitude 52 Main wind belts The Coriolis effect gives rise to the three main wind belts in each hemisphere at the surface: ∙ The easterly trade winds in the tropics ∙ The prevailing westerlies in mid­latitudes ∙ The polar easterlies 53 Doldrums, ITCZ Doldrums, ITCZ: The doldrums are the region near the equator where the trade winds from each hemisphere meet. This is also where you find the intertropical convergence zone (ITCZ). It is characterized by hot, humid weather with light winds. Major tropical rain forests are found in this zone. 54 Horse latitudes The horse latitudes are the region between the trade winds and the prevailing westerlies. In this region the winds are often light or calm. 55 Answer questions like: Why are there seasons? Why is one part of the world warmer than another? Why are there deserts and why are they where they are? Outline Why is there wind?! (That is, what causes wind?) Why are there windy areas over some parts of the seas, and “doldrums” over others? 56...
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This note was uploaded on 03/23/2010 for the course ISP 217 taught by Professor Peacor during the Spring '08 term at Michigan State University.

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