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Energy Transfers

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by

Miss Cummins

on 21 October 2015

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Transcript of Energy Transfers

High and Low pressure
Energy Transfers
Latitude
Location on earth - north and south of the equator

Angular distance
Measured in
degrees

Ranges from 0° at equator to 90° at the Poles
90° N and 90° S
Winds blow from ......
At the equator, the warm air rises, creating a zone of low pressure.

The warm air spreads outwards towards the poles.
The Coriolis Effect
Global Winds
Wind is moving air

Difference in temperature cause wind movement

Air moving from high pressure to low pressure
Pressure is the force of air on the earth's surface
Low pressure
is the result of rising air, which is warm.

Warm
air rises as it is light.
High pressure
is the result of decending air, which is cold.

Cold
air falls as it is heavy.
Difference
in air pressure caused by unequal heating of the earth.
Warm
winds blow from the equator.
Cool
winds blow from high latitudes.
high pressure to low pressure areas.
Global pattern
A.k.a General Circulation
As is nears the poles the air
cools
- becomes heavier and sinks earthwards.

This occurs about
30° north and south
of the equator.

Sinking air = areas of
high
pressure.
This air blows out from these areas of high pressure.

Some blows back towards equator (
trade winds
).

They are pulled back by
vactating warm air
, while some travels polewards.
Air moving from low latitudes = generally warmer.

60° N&S
warm air meets cold polar air.

These areas were the masses meet form
polar fronts
and are areas of
low pressure.
At the
poles
(90°) the extremely cold air presses down to create a
zone of high pressure.

This process continues over and over creating
convection currents
(circular) - this keeps the atmosphere in constant motion.
Global winds are deflected when the earth rotates.

The earth rotates on its axis from west to east.
The result of this is that the winds are deflected:

1. To the
right
of its direction of motion in the Northern Hemisphere.

2. To the
left
of its direction of motion in the Southern Hemisphere.
Winds blow from east and west and not just north and south, this is due to the . . .
Zones seperating wind belts
Doldrums
Horse Latitudes
Polar Fronts
Doldrums
Area near the
equator
(0°)

Trade winds die out here

Means 'stagnation or listlessness'

Named by English sailors who were trapped by the lack of 'trade' winds to carry them onto the next port.
Horse Latitudes
Areas of still, dry weather
30° North and South of the equator
Ships tried to avoid this zone

Where did this name come from?
Horses being transported
Sailors - threw cargo over
Polar Fronts
60° North and South of equator

Varies with seasons
Ocean Currents
'
Rivers
' of water

This movement is caused by the
earths rotation; winds; temperature
in the ocean
Warm Currents
From the equator
Example:
North Atlantic Drift
Also known as the
Gulf Stream
Begins in the Caribbean
Flows past the West of Ireland -
increasing the temperature
Keeps coasts in Western Europe ice-free
Cold Currents
From areas of
high latitude

Example:
Labrador Current

Travels
South
along NE coast of N.America

Freezes water -
icebergs

Effects of Ocean Current
Positives
Negatives
Ice-free coasts

Warmer winds

Good fishing grounds
Creation of icebergs

Colder winds

Difficult sailing conditions
Page 76
Question 1, 2 and 3
Full transcript