g10 - Today Ch 13 Deserts& Winds “We don’t survive...

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Unformatted text preview: Today: Ch 13: Deserts & Winds “We don’t survive the desert, we live here” here” - Pima Indian Pima Deserts & winds 1) Deserts: where & why 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) Question: how much rain do we get in Tempe every year? Deserts & winds 1) Deserts: where & why 1) Deserts: where & why What causes deserts? Important factors: Global distribution of q air pressure air q wind wind Relationship between q rainfall rainfall q evaporation evaporation www.weatherchannel.com Deserts & winds 1) Deserts: where & why 1) Deserts: where & why Deserts & winds 1) Deserts: where & why 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: hot air x rises to 15-20 km x low pressure belt x Deserts & winds 1) Deserts: where & why 1) Deserts: where & why Deserts & winds 1) Deserts: where & why 1) Deserts: where & why Deserts & winds 1) Deserts: where & why 1) Deserts: where & why Deserts & winds 1) Deserts: where & why 1) Deserts: where & why Middle-latitude deserts x exist in rain shadows. Deserts & winds 2) Basin and range 2) Basin and range Basin and range x mountainous desert landscape Deserts & winds 2) Basin and range 2) Basin and range Basin and range x mountainous desert landscape Deserts & winds 3) Wind erosion/ deposits 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? Deserts & winds 3) Wind erosion/ deposits 3) Wind erosion/ deposits Sand dune formation Deserts & winds 3) Wind erosion/ deposits 3) Wind erosion/ deposits Desert pavement Deserts & winds 3) Wind erosion/ deposits 3) Wind erosion/ deposits Deserts & winds 3) Wind erosion/ deposits 3) Wind erosion/ deposits Graded beds ...
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