Chapter: Atmosphere Section 3: Air...
Transcript of Chapter: Atmosphere Section 3: Air...
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Chapter: Atmosphere
Table of Contents
Section 3: Air Movement
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We will learn about Air Movement=Wind
-Why different latitudes on Earth will receive
different amounts of Solar Energy
-The Coriolis Effect
-How water and land affect the air above them
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Why it’s important:
Wind systems will affect weather and
climate all over the Earth
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When substances
are mixed:
less dense will float
on the denser one
**different densities
cause convection
currents
**This is also valid
for the air in the
atmosphere and
water in the
hydrosphere
We know:
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Air Density
• What happens to the molecules of a
substance when this substance is
warmed up?
• Does the density change?
The molecules or particles will expand
and the substance will become less dense
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Density of gases depends on temperature
Higher temperature - lower density: air rises
Lower temperature – higher density: air sinks
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*The density of the air affects Air Pressure
• Air Pressure – force exerted by the molecules
of air present in the atmosphere
• Read page 103 and write down on your
notebook how air density can affect air
pressure
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*The density of the air affects Air Pressure
• In areas where the air is heated (less dense),
the air pressure is lower, because the
molecules are further apart from each other.
• In areas where the air is cold, the air
pressure is higher.
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Air Movement – Wind
• What is wind?
• Wind is the movement of air from an area of higher pressure to an area of lower pressure
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**Air Movement – Wind
• Earth surface has land and water
• Land and water - strongly influence global wind systems
• Land and water absorb heat differently, creating areas with different air pressure, generating wind
• Land and water absorb heat differently because of their specific heat
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Heated Air
• Areas of Earth receive different amounts of radiation from the Sun because Earth is curved.
• some areas are warmer than others.
• areas closer to the Equator are warmer
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Longitude and Latitudelatitudes closer to the Sun receive more
radiation and are warmer
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How are Winds formed?
1)The heated air at
the equator is less
dense.
2)Moves up in the
atmosphere
3) It is replaced by
denser, colder air
from
the poles, creating
convection currents
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*Forming Wind
The differences in air temperature and density, generate areas with different air pressures in the atmosphere, which creates all the winds that circulate around the globe.
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How air moves
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What causes wind?
1) As we have seen: the difference in
temperature and density of the air in
different areas, but also….
2) the “Coriolis Effect” – phenomenon that
also causes winds
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*Coriolis Effect – Coriolis Effect happens
due to the rotation of the Earth.
It appears that winds and water are deflected
to the right in the Northern Hemisphere and
to the left in the Southern Hemisphere.
*Coriolis Effect
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*It is a phenomenon that causes fluids
such as air and water to curve as they
travel across and above the Earth’s
surface, affecting how winds and storms
move around Earth and therefore the
climate and weather.
*Coriolis Effect
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Coriolis Effect: Fun Fact
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Specific Heat of Water
• Specific heat of the water will affect the movement of air.
• read page 659 and copy the definition of specific heat.
• Read page 659 and explain how the specific heat of water differs from the specific heat of many other substances
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Local Winds: Sea and Land Breezes
• These breezes will blow in one direction during the day and to the opposite direction at night.
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Sea and Land Breezes
*This constant air movement happens because of the differences in the temperatures and density of the air above land and water.
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Sea and Land Breezes
• It takes more time for the water to cool down and warm up compared to the land (Sp. Heat), this affects the temperature and density of the air above it and the local wind patterns.
• Water has a high specificheat when compared to other substances
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- Sea breeze – the cool air
- Land breeze – the cool air
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• Global Winds – affect the weather
patterns of the entire planet
• Local Winds – affect local weather –
Sea breeze and Land breeze