air masses & fronts€¦ · when warm air rises and remains over the same area for days or...
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Air Masses & Fronts
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Essential Standard 2.5
Understand the structure of and
processes within our atmosphere.
Learning Objective 2.5.2
Explain the formation of typical air
masses and the weather systems that
result from air mass interactions.
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I Can StatementsAt the end of this lesson, you should be
able to say, with confidence:
• I can explain how heat is transferred through
radiation, conduction, and convection.
• I can list four different types of air masses and
describe their characteristics.
• I can distinguish describe the weather
associated with cold, warm, stationary, and
occluded fronts.
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Solar FundamentalsThe Sun is the source of all energy in the atmosphere
and is transferred throughout the atmosphere by radiation, conduction, and convection.
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RadiationRadiation is the transfer of energy
through electromagnetic waves
Long Wavelengths
LowFrequency
Short Wavelengths
HighFrequency
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Radiant energy, specifically light and heat energy, is transferred from the Sun to Earth in the form of
electromagnetic waves.
Radiant Energy
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RadiationAs radiation enters Earth’s atmosphere, about 25% of the energy is absorbed by the clouds
and gas molecules in the atmosphere.
Another 25% is reflected back out
into space.
About 50% of solar radiation is
absorbed by Earth’s surface.
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ConductionConduction is the transfer of
energy when molecules come in contact and collide.
Once radiant energy strikes Earth’s surface, heat energy is transferred across the ground surface and into the above air molecules through
conduction.
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ConvectionConvection is the transfer of
energy by the flow of a heated substance.
Cool
Condenses
Warm
Expands
When air cools, the molecules condense and
the air sinks.
When air warms up, the molecules expand and
their air rises.
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ConvectionConvection occurs in the atmosphere when the
warm air, above the surface of Earth, rises, cools, and sinks creating convection currents.
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When warm air rises and remains over the same area for days or weeks, the result is a formation of an air mass.
Air Mass
An air mass is a large body of air that takes on the characteristics of the area over which it forms.
Air masses can form over both land and water.
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An air mass that forms over water will have a high water
content and are called maritime air masses.
Maritime Air Mass
An air mass that
forms over cold water
is called a maritime
polar air mass.
An air mass that forms
over warm water is
called a maritime
tropical air mass.
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An air mass that forms over land is called a continental
air mass and tend be very dry.
Continental Air Mass
An air mass that
forms over cold land
is called a continental
polar air mass.
An air mass that forms
over warm land is
called a continental
tropical air mass.
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Air masses do not stay in one place indefinitely.
Fronts
Eventually they
move and
encounter other air
masses.
When two different air
masses interact, it is
called a front.
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In a cold front, cold, dense air forces warm air
upwards where it cools and condenses.
Cold Front
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Cold Front – Rain & ThunderstormsAt the frontal boundary, the water vapor in the
rising warm air condenses into clouds, rain,
and thunderstorms.
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Cold FrontCold fronts are represented on maps as a solid
blue line with blue triangles that point in the
direction of the front’s motion.
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Warm FrontIn a warm front, advancing warm, moist air from
the southwest displaces cold air.
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Warm FrontAt the frontal boundary there is usually extensive
cloudiness and gentle rains, followed by prompt
clearing and warming as the front passes.
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Warm fronts appear on a map as red lines with
red semicircles pointing toward the direction the
front is moving.
Warm Front
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A stationary front occurs when two air masses
meet with neither one advancing into the
other’s territory.
Stationary Front
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Stationary FrontStationary fronts are associated with long
continuous periods of rain.
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Stationary fronts are represented on a map
by a combination of blue triangles and red
semi-circles on opposite sides.
Stationary Front
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Occluded FrontAn occluded front occurs when a warm front
becomes wedged between two cold fronts
with the warm air being pushed upwards.
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Occluded fronts are association with
rain and snow, followed by drier air.
Occluded Front
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Occluded fronts are represented on a map
with alternating purple triangles and semi-
circles on the same side.
Occluded Front
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The End