Lecture12 oct21-bb (1)
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  • 1. isobars 820 mb 860 mb 900 mb 90oF 70oF Cold Warm 780 mb
  • 2. Land breeze
  • 3. 3
  • 4. Monsoon
  • 5. wind system is one that changes direction seasonally, blowing from one direction in summer and from the opposite direction in winter
  • 6. Summer  where is the pressure higher between land and ocean? Warm surface  air rising  low surface pressure Wind Cool surface  air sinking  high surface pressure
  • 7. monsoon wind system is one that changes direction seasonally, blowing from one direction in summer and from the opposite direction in winter Stepped Art
  • 8. Valley breeze
  • 9. -Upslope/valley breeze forms as solar radiation heats the slope of mountain Q: What would happen for the air adjacent to the slope from the heating? SW 750 mb H L 800 mb 850 mb 850 mb 900 mb 900 mb 9 Stepped Art
  • 10. Katabatic winds
  • 11. Katabatic winds decent down a mountain slope Q: What would happen ? conditions for katabatic winds ? be optimal LW 750 mb 750 mb 800 mb 800 mb 850 mb 850 mb 900 mb 900 mb 11
  • 12. Katabatic winds decent down a mountain slope Optimal conditions o snow-covered elevated plateau o generates a horizontal pressure gradient H PGF LW L 750 mb 800 mb 850 mb 900 mb 12
  • 13. 13 Fig. 7-13, p. 179
  • 14. Advection issues on eddy flux measurements
  • 15. Tower-1 Tower-2
  • 16. Chinook
  • 17. 1.The air at point A in the figure below will be WARMER COLDER than at B and will have a HIGHER LOWER dew point.
  • 18. 2. Lifting by topography Fig. 5-14, p. 119
  • 19. chinooks are descending, warm and dry winds on the leeside of a mountain range 19
  • 20. Santa Ana winds
  • 21. Santa Ana winds created wildfire 21
  • 22.  hot and dry winds that often sweep through the LA Basin in the fall and winter winds descend from hot desert terrain down to the L.A. Basin  parcel becomes warmer and drier because of compression heating need a strong high over southwestern U.S. 22 Stepped Art
  • 23. Single-Cell Model Three-Cell Model
  • 24. Single-cell model of General Circulation If you assume earth is uniformly covered by water sun is directly over equator no rotation you will end up with a single cell pattern called the Hadley Cell warm air rises at the equator, cold air sinks in the poles Q: This single cell has never observed, what important processes have we neglected?
  • 25. Three-cell model of General Circulation Hadley cell (0-30o); Ferrel cell (30-60o); and Polar cell (60-90o) Q: How can we draw the basic characteristics of the general circulations?
  • 26. 1. 3. draw wind directions by taking into account CF draw five belts at 0, 30, and 60 degree and mark L and H on each of them NH, deflection to right SH, deflection to left 2. draw PGF from H to L Polar H 60o 30o L H Subpolar low L Subtropical high 60o H 30o PGF L Intertropical convergence zone L 0o PGF 0o 30o H 60o Subtropical high L Subpolar low L Polar H H 30o
  • 27. Hadley cell Thermal cell