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Air Pressure and Wind

Review Activity

Sydney Stribrny

on 8 March 2013

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Transcript of Air Pressure and Wind

Review Activity Air Pressure and Wind Air Pressure The measure of the force with which air molecules push on a surface. Wind Barometer an instrument that measures atmospheric pressure Air pushes mercury down and forces it up the tube. The higher up you travel there is less air molecules pushing down on you causing there to be a lower pressure. An increase in altitude leads to a decrease in pressure. Mercury drops = low pressure because the air is less dense which causing it to rise. The rising air puts less force on the mercury in the dish, allowing the mercury in the tube to drop and fill the dish. Mercury rises = high pressure because the air is denser it sinks, pushing the mercury in the dish down and forcing it up the tube. Temperature Warm air Cold air Less dense
Lower pressure More dense
Higher pressure Humidity High humidity = LOW pressure Low humidity = HIGH pressure Humidity Temperature Reading Maps Figure out the air pressures in the flagged areas High humidity + Warm Temperatures = LOW pressure Low humidity + cold temperatures = HIGH pressure Low humidity + Hot temperatures = Low/High pressure (Heat rises = less force) (Cool air sinks = more force) Isobars -Shows the strength of the air pressure in an area. STRONG pressure gradient weak pressure gradient Low pressure = isobar bar numbers decreasing High pressure = isobar numbers increasing H L High pressure Low pressure Low humidity Cold temperatures cP air masses High humidity Warm temperatures mT air masses Decreasing numbers = decreasing pressure Barometer rises Barometer drops Metal Can Lab -Metal can is heated.
-Cap is off
-Air molecules are starting to rise. -Heat is taken away
-Cap is on
-Unequal balance in pressure or force = crushed can H L Air travels from high to low pressure seeking equilibrium. Coriolis Effect -is the curving of the path of a moving object from an otherwise straight path due to the Earth's rotation Rule 1:
Wind flows from High to Low pressure Rule 2:
Winds from the N. hem. curve to the RIGHT.
Winds from the S. hem. curve to the LEFT. Wind Rules Rule 3:
Winds are named for where they COME FROM. Global Winds And Wind Belts L H L H L N. East Trade Winds S. East Trade Winds Prevailing S. Westerlies Polar N. Easterlies Prevailing N. Westerlies Polar S. Easterlies Rule # 1 (Wind travels from high to low pressure). Radiation from from the sun hits the equator on a direct angle of isolation. This heat is condensed in a smaller area which increases the temperature. Warm, less dense air rises creating a low pressure. It cools and condenses when it gets farther away from the equator creating a higher pressure. Air flows from high to low pressure. Therefore, the cold air would flow towards the lower pressure at the 60 degrees N. Air would be trapped in this circular motion known as convection. Local Winds What causes Wind? H L L STRONGER winds because of the steeper slope. STRONG pressure gradient WEAK pressure gradient WEAKER winds because of the broader slope. High Pressure System L H H WEAK pressure gradient STRONG pressure gradient STRONGER winds WEAKER winds *wind flows from HIGH to LOW pressure *wind flows from HIGH to LOW pressure Low Pressure System 116 115 114 Close isobars = STRONG winds Spread out isobars = weak winds 996 997 998 Spread out isobars = weak winds Close isobars = STRONG winds Pressure Gradient Force: the force that results from differences in pressure and causes air to move from High to Low pressure. Air flows out of the high pressure.
Coriolis Force is stronger as the wind leaves the center of the system
Winds are curved to the right
clockwise flow around the higher pressure system WIND BELTS - breaks between the convection currents Northern Hemisphere (spinning counter clockwise) - Because of Earth's rotation winds are deflected to the right of the direction they are moving. No rotation that can effect the direction of the wind. High Pressure System High Pressure Low Pressure Wind flows into the low pressure system
Pressure Gradient Force is stronger as the wind nears the center of the system.
Winds curve to the left
Counter clockwise motion around the low pressure Low Pressure SEA breeze Radiation travels through the air and is absorbed through conduction into the ground. Warm air rises because it is less dense. There is then a less force pushing down on earth = low pressure. As the air moves away it begins to cool and condense. Air begins to sink, creating a higher pressure over the water. Air flows from high to low pressure. Air from the higher pressure over the water will flow to the lower pressure over the land creating a sea breeze. Water heats slower because it is transparent and less dense than the land. The sun's radiation can penetrate meters deep in the water and only the very top layer of the crust. Once the radiation hits the water, it spreads out evenly over a bigger area compared to the land. Therefore taking longer to heat. LAND breeze Air then sinks creating a higher pressure over the land. Water takes longer to cool because the temperature has to spread out over a bigger distance than the land. The warmer temperature causes the air to rise. The decrease in force is a decrease in pressure. Air begins to cools as it gets father away from the ocean. Air flows from high to low pressure, so the air will blow toward the lower pressure over the water. The Southern Hemisphere does the exact opposite. It spins clockwise which deflects the winds to the left. 0 30 30 60 60 90 90 H H System Winds
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