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Arid environment By MUHAMMAD FAHAD ANSARI 12IEEM 14

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MUHAMMAD FAHAD ANSARI
12IEEM 14

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Arid environment By MUHAMMAD FAHAD ANSARI 12IEEM 14

  1. 1. Hot Arid and Semi-arid EnvironmentsMUHAMMAD FAHAD ANSARI 12IEEM 14
  2. 2. Hot Arid and Semi-arid EnvironmentsCLASSIFICATION AND DISTRIBUTIONOF HOT ARID AND SEMI ARID ZONES
  3. 3. Definitions Simple oneWhat is a desert (arid area)?• <250mm precipitation per year(Semi arid area = 250 – 500 mm per year)More advanced……
  4. 4. WHAT IS ARIDITY? Ratio of average precipitation (P) to potential evapotranspiration (PET*) = aridity index Arid areas: <0.20 Semi-arid areas 0.20 -0.50 Koppens classification*See page 134 for def of pet
  5. 5. Semi- Aridarid
  6. 6. Today: Ch 13: Deserts & Winds
  7. 7. “We don’t survive the desert, we live here” - Pima Indian
  8. 8. Deserts & winds 1) Deserts: where & why Earth’s dry regions: 30% of all land 2 climate types of dry regions:  desert (arid)  steppe (semi-arid, surrounds deserts) Question: how much rain do we get in Tempe every year?
  9. 9. Deserts & winds 1) Deserts: where & whyWhat causes deserts?Important factors: Global distribution of  air pressure  wind Relationship between  rainfall  evaporation www.weatherchannel.com
  10. 10. Deserts & winds 1) Deserts: where & why

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