5 Written questions
5 Matching questions
- What is the ITCZ?
- Thermal equator?
- What are the four major pressure areas on Earth?
- Describe the Subpolar Low Pressure area.
- What do low pressure cells tend to do?
- a 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.
- b Low pressure cells tend to ascend and converge.
- c The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.
The four major pressure areas on Earth are the Equatorial Low (warm, wet 10 degrees N/S), Polar High (cold, dry 90 N/S), Subtropical High (hot, dry 20-35 N/S), and the Subpolar Low (cool, wet 60 N/S).
- e An isoline connecting all points of highest mean temperature.
5 Multiple choice questions
- The four factors that affect atmospheric circulation are as follows: the Coriolis Effect, gravity, friction forces, and changes in air pressure.
- Equal elevation.
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.
Land-sea breezes are driven by the thermal inertia of water. When land and sea receive the same amount of insolation, the land heats up faster than the water. This temperature gradient causes winds to blow. At night, radiational cooling cools the land faster than the water so that the temperature gradient makes a wind blow from land to sea. These breezes also occur for large bodies of water, such as the Great Lakes.
- The Equatorial Low Pressure area occurs along the Intertropical Convergence Zone (ITCZ) and is the area where the Trade Winds and doldrums occur.
5 True/False questions
What is the rule for naming winds? → 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.
What are doldrums? → Doldrums refers to a broad east-west belt of light winds that occur along the equator where the Trade Winds from the northern and southern hemispheres converge.
Describe the Polar High Pressure area. → The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.
Explain air pressure tendency. → Air pressure tendency is important, along with the air pressure reading on a barometer. Falling air pressure, which corresponds to a decrease in the length of mercury in the column on a mercurial barometer, generally indicates stormy weather.
Isotach? → Equal pressure.