the general circulation anthes 5: 97-106. global pressure and precipitation zones
TRANSCRIPT
The General Circulation
Anthes 5: 97-106
Global Pressure and Precipitation Zones
Jet Streams
Regional and Local Circulations
Anthes, Chapter 5, pp. 105-07 and 132-35
World’s Deserts and Dust Trajectories
Indian Summer Monsoon (wet)
Thermal low over Nepal.
Winds from sea.
Land slopes up.
Very wet.
425 in. of rain.
Latent heat release intensifies the circulation.
Indian Winter Monsoon (dry)
Cold, shallow High over Nepal.
Winds from land.
Air subsides from the highlands.
Climate fair and dry.
Pacific High (cold) vs. Bermuda High (warm)
Florida sea breeze convergence
Hawaii sea breezes from space
Lake Effect
Rain, Freezing Rain, Sleet, Snow
Air Masses and Fronts
Anthes, Chapter 5, pp. 107-113.
Air Masses
HOT COLD
WET mT mP
DRY cT cP
Air Mass Source Regions
Classic Norwegian Cyclone Model
Life Cycle of a Cyclone
Cold Fronts and Warm FrontsA Front is a transition zone between two air masses.
Stationary front -- no movement
Cold front
1. Sharp temperature change over short distance
2. Marked changes in the moisture (dew point)
3. Wind shift
4. Pressure change
5. Showery (convective) precipitation, then clearing
Warm front
1. Slower and more gradual transition than cold front
2. Lowering clouds (stratus) and steady precipitation
Cold Front (top), Warm Front (bottom)
Occluded Front
Upper Air Support: The Big Picture