Atmospheric Circulation
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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Barometer
Is used to measure air pressure
Wind
Is the horizontal motion across the Earths surface • It is created by gradients in air pressure/density • The greater the pressure gradient/difference the stronger the wind is
Forces that determine winds:
• Pressure gradient force • Coriolis Effect • Frictional Force
Pressure Gradient Force
• Is responsible for generating wind to blow from high pressure to low pressure perpendicular to the isobars • Fluids like air/water move from areas of high pressure to low pressure
Wind blows which was to the isobars?
They blow perpendicular to the isobars from a high pressure zone to low pressure zone
When considering PGF on its own, the angle is…
Perpendicular
How are convection loops created?
They are created by unequal heating a cooling of the surface
Pressure gradient controls…
Horizontal air movement
Air temperature controls…
Vertical air movement
Coriolis Effect
Is an apparent force caused by the Earth’s rotation
Coriolis force is always ____ to the wind
Perpendicular
Coriolis Force =
PGF, then the wind blows parallel to the isobars with low pressure to the left if you’re in the Northern Hemisphere
Geostrophic Winds
Are upper atmospheric winds with no friction - Upper level winds run parallel to the isobars, with low pressure to the left when you’re unfacing the wind in the northern hemisphere
Friction Force
• Friction from the surface slows wind speed and combines with other forces to influence wind direction, basically friction slows down wind
The effect of friction extends to about…
500m above the surface
The winds from a northern hemisphere cyclone rotate
counter-clockwise
The winds from a low pressure system in the Southern Hemisphere rotate:
clockwise
Why do cyclones in the northern and southern hemisphere spine in opposite directions?
Because of the Coriolis effect
Will land or land near the water be cooler? Why?
Land near the water will be cooler as land warms up quickly during the day and cools down quickly at night
Why will the water stay warm at night?
Because water has the capacity to store heat for a longer period of time
It is always low pressure…
Along the surface of the equator as it is near the tropics (its always warm near the equator)
What kind of cells does the subtropics have?
High pressure cells
Why do the poles have high pressure?
Cause it is so cold at the poles, the air falls
Atmospheric circulation between the equator and the sub tropics is called:
Hadley cells