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Characteristics of the Atmosphere

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Katelynn Dorn

on 10 February 2015

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Transcript of Characteristics of the Atmosphere

23.1
Characteristics of the Atmosphere
weather- condition of atmosphere at particular time or place
climate- general weather conditions over many years in a certain place
Meteorology
1. Nitrogen, 2. oxygen, 3. argon
water vapor- how does it get added to the atmosphere?
1-4%
ozone- absorbs UV rays
CFCs and nitrous oxide break down ozone
atmospheric dust
Composition of the Atmosphere
what uses up the most oxygen?
what adds oxygen back to the air?
Oxygen in Atmosphere
nitrogen cycle
nitrogen-fixing bacteria change N2 gas into nitrates
animals eat plants so their waste contains nitrogen and they return it to the soil
the denitrifying bacteria return the nitrogen to the atmosphere
Nitrogen in Atmosphere
Atmospheric Pressure
99% of Earth's gases are found w/in 32 km of its surface
atmospheric pressure- ratio of force of air to area of surface it presses on (10,300 kg per1 m^2 from sea level to top of atmosphere
how do you know when atmos. pressure changes when you're on a plane?
Barometers
mercurial barometer
- higher pressure squeezes mercury higher up the tube
760 mm- 1 atmosphere
millibars- .001 of S.A.P.
Anaeroid barometer
- w/o liquid, vacuumed container
sides bulge out- low pressure
sides cave in- high pressure
altimeter
Layers of the Atmosphere
troposphere- weather
temp. decreases with altitude
tropopause
stratosphere- ozone layer (-60 degrees C at bottom, 0 degrees C at top)
stratopause
mesosphere- 50-80 km high
coldest layer (-90)--> mesopause
thermosphere- thinnest air, highest temps
2000 degrees C
ionosphere- bottom, exosphere- closer to space
Air Pollution
sulfur dioxide, CO, lead, hydrocarbons
burning of fossil fuels
acid precipitation
temperature inversion- warm air on top of cool air
L.A
smog- trapped by mountains
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