Transcript 22.3 Notes Wind

22.3
Atmospheric Circulation
It all starts with unequal heating of Earth
that cause differences in pressure
• Warm air is less dense, rises
and creates LOW pressure
• Cold air is more dense, sinks
and creates HIGH pressure.
• Air flows from poles (H) to
equator (L)
In a high pressure area,
air will (rise, sink)
because the air is
(less, more) dense.
This is because the air is
(cold, warm)
and (rises, sinks).
Therefore, clouds CANNOT form.
In a low pressure area,
air will (rise, sink)
because the air is
(less, more) dense.
This is because the air is
(cold, warm)
and (rises, sinks).
Therefore, clouds are
LIKELY to form.
Coriolis Effect
• Moving objects follow a
curved path due to Earth’s
rotation.
• Deflected right in northern
hemisphere (Clockwise)
• Deflected left in southern
hemishphere
(Counterclockwise)
Global Winds
• Wind flows from
poles to equator in
convective cells.
• Each cell correlates
to a wind belt that
forms wind that
flows one way.
(prevailing wind)
• Wind is named for
the direction it
come from.
• Doldrums – form at
equator where the
warm air moves upward
and there is little wind.
• Horse Latitudes –form
at 30 degrees N and S
where the air decends
and there is little wind
Jet Stream
Narrow band of strong wind
that blows in the upper
troposphere
Local Wind
Sea Breeze – cool
wind moving
from water to
land in afternoon
L
H
Warm Land
Cool Water
Land Breeze – cool
wind moving from
land to water at
night
H
Cool Land
L
Warm Water
Valley Breeze – warm
air from the valley
moves upslope during
day
Mountain Breeze –
cool air descends
from mountain peak
at night
• Mountain Breeze