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Unformatted text preview: highs to equatorial lows (Hadley Cell) • Polar easterlies—air moving away from the poles (Polar Cells) • Westerlies—trade winds descend in subtropics • Abiabatic Processes o Temperature change w/o loss of heat Warm air expands and rises Cold air loses temperature w/o losing heat Contracts and warms • Pressure gradient over polar • Jet Stream o Tropical atmosphere absorbs heat, air expands, becomes less dense, rises, forms thick mass o Polar air cold, lies near surface o Interaction makes “jet stream” o Belt of winds 1000 km wide, flows 120-300 mph o Changes seasonally (over Canada in summer and US in winter) • When air masses meet o Cold fronts cold air lifts warm air to high altitudes, produces thunderstorms o Warm Fronts warm air driven on top of cold, produces clouds/rain...
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This note was uploaded on 04/07/2008 for the course ENV 114 taught by Professor Cole during the Spring '08 term at Northeastern.
- Spring '08