Lecture 21

Lecture 21 - BWh & BSh: Tropical Desert...

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Lecture 21 'B' CLIMATES * Areas where the Potential Evaporation > Precipitation * PE (Potential Evapotranspiration): the amount of moisture that, if it were available, would evaporate from a given area * 'B' climates are the only climates based on precipitation ** General characteristics: * cover 25 - 35% of earth's land area * precip. is quite variable, spatially & temporally Types: BW: Arid or desert BS: Semi-arid or steppe (< 10 inches) (10-20 inches) BWh: Tropical Desert BSh: Tropical Steppe BWk: Mid-latitude Desert BSk: Midlatitude Steppe * 3rd letter: h = hot & k = cool to cold
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Unformatted text preview: BWh &amp; BSh: Tropical Desert &amp; Tropical Steppe Location : centered on ~ 20 - 30 N &amp; S: n Mexico, sw U.S.; Atacama, Sahara &amp; the Sahel, Namib, Kalahari, Saudi Arabia, central &amp; western Australia Characteristics : very low precip.; high Ts, hottest on earth * highest T's ever recorded on earth (136F in Libya) Mechanisms : * dominated by STH cells all year BWk &amp; BSk: Mid-latitude Desert &amp; Steppe Location : poleward of BSh &amp; BWh areas; Great Basin and Great Plains(U.S.); Patagonia(Argentina), central Turkey to central Asia, Takla Makan(sw China) Gobi desert area (Mongolia/nw China) Characteristics : hot summers, BUT cool to cold winters Mechanisms : Rainshadow effect: Great Basic and Great Plains, Patagonia, Russian Steppe *...
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Lecture 21 - BWh &amp;amp;amp; BSh: Tropical Desert...

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