Naturalists at Large: deserts

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Naturalists at Large Desert Slide Show

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Naturalists at Large: deserts

  1. 1. Deserts & Winds
  2. 2. “We don’t survive the desert, we live here” - Pima Indian
  3. 3. Deserts & winds 1) Deserts: where & why Earth’s dry regions: 30% of all land 2 climate types of dry regions: q desert (arid) q steppe (semi-arid, surrounds deserts)
  4. 4. Deserts & winds 1) Deserts: where & whyWhat causes deserts?Important factors: Global distribution of q air pressure q wind Relationship between q rainfall q evaporation www.weatherchannel.com
  5. 5. Deserts & winds 1) Deserts: where & why
  6. 6. Deserts & winds 1) Deserts: where & why Low-latitude deserts (recall: “latitude” = east-west line on the globe) x Tropic of Cancer x Tropic of Capricorn In contrast…. x Equator: x hot air x rises to 15-20 km x low pressure belt
  7. 7. Deserts & winds 1) Deserts: where & why
  8. 8. Deserts & winds 1) Deserts: where & why
  9. 9. Deserts & winds 1) Deserts: where & why
  10. 10. Deserts & winds 1) Deserts: where & why Middle-latitude deserts x exist in rain shadows.
  11. 11. Deserts & winds 2) Basin and range Basin and range x mountainous desert landscape
  12. 12. Deserts & winds 2) Basin and range Basin and range x mountainous desert landscape
  13. 13. Deserts & winds 3) Wind erosion/ deposits Wind erosion: Important in arid environments Example: Types of sand dunes: Sand dune shape depends on: Flat or hilly? How much sand? Winds steady or intermittent? Wind direction constant? Vegetation present?
  14. 14. Deserts & winds 3) Wind erosion/ deposits Sand dune formation
  15. 15. Deserts & winds 3) Wind erosion/ deposits Desert pavement
  16. 16. Deserts & winds 3) Wind erosion/ deposits
  17. 17. Deserts & winds 3) Wind erosion/ deposits Graded beds

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