Thermal Circulation By Dr. Robert M MacKay Clark College Physics & Meteorology.

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Presentation transcript:

Thermal Circulation By Dr. Robert M MacKay Clark College Physics & Meteorology

A tale of two identical cities

The air above City 1 cools and that above City 2 warms

Air pressure aloft is High above City 2

Winds aloft blow from city 2 to city 1.

Examples of Thermal Circulations

Sea Breeze during the day

Land Breeze at night

South East Asian Monsoon Very dry

South East Asian Monsoon Very wet

Mountain or Valley breeze??

Upward motion of Valley breeze made visible by clouds

Sea breeze convergence zone in Florida giving rise to very frequent thunderstorms. Florida has more thunderstorms each year than anywhere else in the US.

Stepped Art Fig. 9-25, p. 241

Local Winds Santa Anna Winds Santa Anna Winds –Warm dry that blows from east or northeast don canyons into S. California –Very fast, desiccates vegetation, providing fuel for fires Desert winds Desert winds –Dust storms, sand storms, dust devil, haboob

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