Energy Exchanges in the Atmosphere Atmosphere - blanket of gas that surrounds the earth (the air...
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Transcript of Energy Exchanges in the Atmosphere Atmosphere - blanket of gas that surrounds the earth (the air...
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Energy Exchanges in the
Atmosphere
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Atmosphere - blanket of gas that surrounds the earth (the air around us)
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Atmospheric Variables that cause weather conditions
TemperaturePressure
Air MovementVisibilityHumidity
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Weather - a description of the
atmospheric variables at a given place during a short period of time
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Where does most weather occur?
In the TROPOSPHERE which is the LOWEST
PART OF THE ATMOSPHERE
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Atmospheric Variables
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Temperature Variationsaffected byInsolationAltitudeClouds
Pollution
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Pressure Variations
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What causes air Pressure?Gravity
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Differences in Pressure are due to:
TemperatureAltitude
Humidity
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TemperatureWhat is heavier warm
air or cold air?COLD AIR
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COLD AIR is more dense and wants to sink causing an increase in
pressure
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AltitudeAs altitude increases air pressure DECREASES
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Because a smaller amount of air above you
weighs less
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Effect ofMoisture Content
orHumidity
on Pressure
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Opposite of what you normally expect
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As the amount of Water Vapor in the air
INCREASES, the weight of the air DECREASES
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Because: water vapor molecules weigh less than dry air molecules
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Measuring Air PressureAir Pressure is
measured using a BAROMETER
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Atmospheric Pressure is measured in
MILLIBARS and INCHES
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Aneroid Barometer
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ISOBAR-Line of equal air
pressure.
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Isobars are used ON WEATHER MAPS
They help show us the location of HIGHS &
LOWS
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Air Movement
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Wind -the horizontal
movement of air
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Atmospheric Transparency
- a measure of the ability of the
atmosphere to pass light
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Dust, Smoke, Water Droplets, etc. in the air
are calledAEROSOLS /
Condensation Nuclei
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They directly affect Transparency which
means, as the stuff in the air increases the amount
of light that can pass through decreases.
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Ingredients of Weather8min video