WOU ES 106 - Air Pressure and Wind (3 pages)

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Air Pressure and Wind



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Air Pressure and Wind

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Lecture Notes


Pages:
3
School:
Western Oregon University
Course:
Es 106 - Earth System Sci
Earth System Sci Documents

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ES 106 Air Pressure and Wind I Pressure A 14 7 lab in2 exerted in all directions up down sideways B Measuring air pressure with barometer 1 millibars standard sea level pressure 1013 2 mb 2 inches of mercury a rises in evacuated tube from pressure on open dish b standard sea level pressure 29 92 inches 3 aneroid barometer uses partly evacuated metal chamber a high fair b low storm c overgeneralization 4 barograph records pressure continuously II Wind A Horizontal movement of air advection 1 flows due to pressure differences Pressure Gradient Force a from high to low b created by unequal heating of Earth s surface 2 affected by surface friction 3 affected by Coriolis Effect B pressure gradient force 1 maps drawn of pressure shown with isobars equal pressure lines 2 spacing of isobars shows the pressure gradient 3 wind blows more strongly with larger pressure gradients 4 initial direction from high pressure toward low pressure but C Coriolis Effect begins to affect direction 1 general mechanism a deflected to right of their path in Northern Hemisphere b deflected to left of their path in Southern Hemisphere c regardless of direction of travel d not affected at equator 2 affect on wind flow a changes direction at 90O angle to wind flow b does not affect wind speed c wind speeds affect amount of Coriolis Effect 1 greater speeds more deflection 2 slower speeds less deflection D friction of Earth s surface affects wind flow 1 upper levels of atmosphere not affected by friction a wind flow follows isobars b geostrophic winds 2 slows wind speeds at lower levels of atmosphere a reduces amount of Coriolis Effect pressure gradient prevails b surface winds directed toward low pressure at angle across isobars c surface roughness affects amount of surface friction III High pressure and low pressure A Low pressure called a cyclone 1 northern hemisphere cyclones turn counterclockwise as winds blow inward toward low pressure and are deflected to right by Coriolis effect 2 southern



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