Class 3b: Winds (global and local). Atmospheric pressure.
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Class 3b: Winds (global and local)
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Transcript of Class 3b: Winds (global and local). Atmospheric pressure.
![Page 1: Class 3b: Winds (global and local). Atmospheric pressure.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d795503460f94a5cccd/html5/thumbnails/1.jpg)
Class 3b: Winds (global and local)
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Atmospheric pressure
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Atmospheric pressure
• Warm air rises, cold air sinks
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Measuring pressure
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Mapping pressure
• Isobars connect points of equal pressure
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What is wind?
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Local winds: sea and land breezes
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Land and sea breezes
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Valley and mountain breezes
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Foehn/chinook winds
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Global circulation
• Hadley cells
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Coriolis effect
• Deflection from Earth’s rotation
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Global circulation
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ITCZ
• Convergence of rising air
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Tradewinds
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Subtropical highs
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Westerlies
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Polar highs and easterlies
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Seasonal shifts
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Monsoons
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Monsoons
• Half the world’s population relies on monsoons