Chapter 7: Atmospheric Circulations Scales of Motions square6microscale square6mesoscale square6synoptic (weather map) scale square6planetary (global) scale Fig 7.2. 7.3, 7.4 The formation of a dust devil. head2rightOn a hot, dry day, the atmosphere next to the ground becomes unstable. head2rightAs the heated air rises, wind blowing past an obstruction twists the rising air, forming a rotating column, or dust devil. head2rightAir from the sides rushes into the rising column, lifting sand, dust, leaves, or any other loose material from the surface. square6isobars and density differences square6thermal circulations – Heating and cooling of the atmosphere above the ground create cold, core high pressure cells and warm, core low pressure cells. square6Sea and Land Breeze square6Uneven heating of land and water square6Day: land hot, water cold = sea breeze square6Night: water hot, land cold = land breeze square6Sea breeze convergence Land breezes occur because land cools off faster than water.
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