5 Written Questions
5 Matching Questions
- How is air pressure measured?
- Isoheight or contour line is what?
- Explain pressure gradients.
- What is the rule for naming winds?
- a The wind direction is always reported as the direction from which the wind is blowing. Winds which blow from the west, for example, are westerlies. They blow towards the east. Winds which blow from the south are called southerlies. They blow towards the north.
Pressure gradients drive air from an area of high pressure to an area of low pressure, creating winds.
- c Equal pressure.
- d A barometer can measure changes in air pressure. The two types of barometers are the mercurial barometer, which is more accurate but less easily transportable, and the aneroid barometer, which is less accurate but more portable.
- e Equal elevation.
5 Multiple Choice Questions
- Equal wind speed.
- The Equatorial Low Pressure area occurs along the Intertropical Convergence Zone (ITCZ) and is the area where the Trade Winds and doldrums occur.
Friction forces drag winds as they move across various surfaces. This effect decreases with height above a surface, and causes air spiraling out of a high pressure cell to turn clockwise (anticyclone). Air spiraling out of a low pressure cell turns counter-clockwise (cyclone). NOTE that in the Southern Hemisphere, this effect is in reverse: high pressures produce cyclones, and low pressures produce anticyclones.
- The ITCZ stands for the Intertropical Convergence Zone, which is the area along the equator where a discontinuous series of thunderstorms occurs, due to the uplift caused by the convergence of winds and solar heating of the ground along the equator.
- The Subtropical High Pressure area consists of Westerlies, the Bermuda High, the Azores High, and the Pacific High.
5 True/False Questions
What are Trade Winds? → Trade Winds blow out of the equator side of the anticyclones. In the Northern Hemisphere, they are the Northeasterly Trade Winds. They are the most persistent winds in the world, blowing in the same direction about 80% of the time.
What do low pressure cells tend to do? → Low pressure cells tend to ascend and converge.
What are the four major pressure areas on Earth? → The Polar High Pressure consists of polar easterlies and the Antarctic High pressure area.
Isotherms are equal to what? → Equal temperature.
Thermal equator? → Equal pressure.