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Ch 13: Deserts

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Title: Ch 13: Deserts


1
Ch 13 Deserts Winds
Today
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We dont survive the desert, we live here
- Pima Indian
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1) Deserts where why
Deserts winds
Earths 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?
5
1) Deserts where why
Deserts winds
What causes deserts?
Important factors
Global distribution of
  • air pressure
  • wind

Relationship between
  • rainfall
  • evaporation

www.weatherchannel.com
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1) Deserts where why
Deserts winds
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1) Deserts where why
Deserts winds
Low-latitude deserts
(recall latitude east-west line on the globe)
  • Tropic of Cancer
  • Tropic of Capricorn

In contrast.
  • Equator
  • hot air
  • rises to 15-20 km
  • low pressure belt

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1) Deserts where why
Deserts winds
9
1) Deserts where why
Deserts winds
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1) Deserts where why
Deserts winds
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1) Deserts where why
Deserts winds
Middle-latitude deserts
  • exist in rain shadows.

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Deserts winds
2) Basin and range
Basin and range
  • mountainous desert landscape

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Deserts winds
2) Basin and range
Basin and range
  • mountainous desert landscape

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3) Wind erosion/ deposits
Deserts winds
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?

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3) Wind erosion/ deposits
Deserts winds
Sand dune formation
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3) Wind erosion/ deposits
Deserts winds
Desert pavement
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3) Wind erosion/ deposits
Deserts winds
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3) Wind erosion/ deposits
Deserts winds
Graded beds
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