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39 terms

The earth and its atmosphere

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Atmosphere
thin, gaseous envelope of gases
99% lies within 30 km of earth's surface
No definite upper limit
protects us from UV rays
Sun radiation
Drives weather patterns, average temperature
What is the atmosphere composed of?
99% permanent gases and 1% variable gases
Permanent gases
constant concentration with time & space.
Variable gases
varying concentration depending upon where/when you are. All weather and climate are associated this.
Atmosphere composition
Permanent gases:Nitrogen 78%, Oxygen 21%
Variable gases: Water vapor (H2O), Carbon dioxide (CO2),
Ozone (O3), Aerosols & Pollutants
Variable gas - Water Vapor
More vapor in warmer locations, less in colder
Only substance that exists in 3 phases near the surface, Phase changes (condensation) form clouds and drive weather
Greenhouse gas - absorbs earth's radiation to keep the surface warm
Variable gas - Carbon Dioxide
Greenhouse gas
Increasing CO2 causes warming
Carbon Dioxide Sources
Decay of plants
Volcanic eruptions
Exhalation of animals
Burning fossil fuels
Deforestation
Carbon Dioxide Sinks
Photosynthesis
Oceans
Why is Ozone high in the atmosphere a good thing?
blocks out harmful UV rays, and is formed naturally. When it is low it create photochemical smog (created by humans)
What causes an Ozone hole?
1) CFC's breaking down into chlorine in the presence of UV radiation then
2) the chlorine reacts with ozone resulting in ozone destruction
Variable components - Aerosol
tiny solid or liquid particles
Important for cloud formation
Variable component - Pollutants
products from incomplete combustion of fossil fuels react with sunlight to form smog and acid rain
Vertical Structure of Atmos
Atmosphere has no definite top, rather thinning out gradually.
Changes in atmospheric properties describe vertical structure.
Vertical structure determines weather and climate.
Where is atmosphere most crowded and most dense?
Most of atmosphere is crowded near the surface
More dense closer to the surface, with density decreasing rapidly with height
Density
the amount of matter (mass) in a given space (volume)
Densit= Mass/ Volume
Air pressure
is a measure of the weight of a column or air over an area. It is defined as force divided by the area

P=f/a
Layer structures
Lapse rate, Isothermal environment, Inversion layer
Lapse rate
rate at which the troposphere cools as you move up in elevation.
Isothermal environment
no change in temperature with height
Inversion layer
change in the sign of the lapse rate (increase)
Vertical profile temperature
Thermosphere, Mesosphere, Stratosphere, Troposphere
Thermosphere
increase in temperature, suns strongest radiation (75 miles)
Mesosphere (mesopause)
decrease in temperature (53 miles)
Stratosphere (stratopause)
increase in temperature, ozone, (31 miles)
Troposphere (Tropopause)
decrease in temperature, day to day weather. All weather occurs here Strong turbulent mixing forced by surface heating. (7 miles)
Weather
is the current state of the atmosphere at a specific time and place. This constantly changes because of temperature, precipitation, pressure, visibility, humidity, winds.
Climate
is the average weather at a particular location. Accumulation of daily and seasonal weather events over a long period. This happens very slow.
Reasons to study weather patterns
Economic efficiency and public safety
What is the primary source of energy for the earth's
atmosphere?
Radiant energy
List the four most abundant gases in today's atmosphere.
Nitrogen, Carbon Dioxide, oxygen, Water vapor
Of the four most abundant gases in our atmosphere,
which one shows the greatest variation at the earth's surface?
Nitrogen
What are some of the important roles that water plays in our atmosphere?
It absorbs CO2, It plays an important role in the heat energy balance. 1) helps transformation from gas to liquid help form latent heat (this an important source for Atmospheric energy), 2) It is also a green house that absorbs the earths out going radiant energy,
Potential energy equation
P=Mgh
M= Mass
G= acceleration of gravity
H= Height above the ground
Kinetic energy
KE= (1/2)mv^2
M= mass
V= velocity= distance divided by time
Fahrenheit to Celsius
C=5/9(F-32)
Celsius to farenheit
5/9(C)+32= F
Fahrenheit to kelvin
Convert to Celsius, add 273 degrees