10forces.pt1.big

10forces.pt1.big - higher when the air is warmer. 7...

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1 Ch. 6: Atmospheric Pressure • Vertical Pressure Profile vs. Temperature • Pressure Measurement Mercury and Aneroid Barometers Electronic Barometers; Barographs • Maps of Pressure Fields Constant Height Chart Constant Pressure Chart
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2 Ch. 6: Forces and Wind • Atmospheric Forces Pressure Gradient Force Coriolis Force Friction • Winds and Balance of Forces Hydrostatic Balance Winds Aloft—Geostrophic Balance Surface Winds Convergence/Divergence • Wind Instruments
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3 Weight of Atmos. Force (F) Sea level pressures: • 1 atmosphere (atm) • 1013.2 millibars (mb) • 14.7 lb./sq. in. (psi)
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4 z P
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5 Pressures and Heights 500 600 700 800 900 500 600 700 800 900 500 mb surface 500-mb Height
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6 Pressures and Heights 500 600 700 800 900 500 600 700 800 900 Cold Warm 5 0 m b s u r f a c e Heights of pressure surfaces aloft are
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Unformatted text preview: higher when the air is warmer. 7 Barometers Mercury Barometer Very accurate and precise Fragile, expensive Needs altitude and temperature correction 8 Barometers Aneroid Barometer Vacuum tank (aneroid cell) Barograph Inexpensive, portable Not as accurate nor precise as mercury barometer No corrections needed after calibration 9 Altimeter 10 Electronic Barometers Sensing element: piezoelectric crystal 11 Reduction of Pressure to Sea Level 990 950 975 870 1000 SL 12 Constant Height Charts Isobars: lines connecting points of equal pressure 13 Constant Pressure Charts Isobaric Charts Height contours: lines connecting points of equal heights...
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10forces.pt1.big - higher when the air is warmer. 7...

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