thermal circulation by dr. robert m mackay clark college physics & meteorology
TRANSCRIPT
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Thermal CirculationThermal Circulation
ByBy
Dr. Robert M MacKayDr. Robert M MacKay
Clark College Physics & Clark College Physics & MeteorologyMeteorology
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A tale of two identical A tale of two identical citiescities
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The air above City 1 cools and that The air above City 1 cools and that above City 2 warmsabove City 2 warms
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Air pressure aloft is High above City Air pressure aloft is High above City 22
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Winds aloft blow from city 2 to city Winds aloft blow from city 2 to city 1.1.
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Examples of Thermal Examples of Thermal CirculationsCirculations
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Sea Breeze during the day
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Land Breeze at night
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South East Asian MonsoonVery dry
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South East Asian Monsoon
Very wet
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Mountain or Valley breeze??
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Upward motion of Valley breeze made visible by clouds
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Sea breeze convergence zone in Florida giving rise to very frequent thunderstorms. Florida has more thunderstorms each year than anywhere else in the US.
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Stepped Art
Fig. 9-25, p. 241
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Local WindsLocal Winds
• Santa Anna WindsSanta Anna Winds– Warm dry that blows from east or Warm dry that blows from east or
northeast don canyons into S. Californianortheast don canyons into S. California– Very fast, desiccates vegetation, Very fast, desiccates vegetation,
providing fuel for firesproviding fuel for fires
• Desert windsDesert winds– Dust storms, sand storms, dust devil, Dust storms, sand storms, dust devil,
haboobhaboob
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