5 Written Questions
5 Matching Questions
- What is the rule for naming winds?
- What is the ITCZ?
- Explain air pressure tendency.
- Describe the Subpolar Low Pressure area.
- What are the four major pressure areas on Earth?
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).
- b The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.
- c 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.
- d 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.
- e 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.
5 Multiple Choice Questions
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.
- High pressure cells tend to descend and diverge.
- Equal wind speed.
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.
- Equal rainfall.
5 True/False Questions
Isoheight or contour line is what? → Equal elevation.
Explain pressure gradients. →
Pressure gradients drive air from an area of high pressure to an area of low pressure, creating winds.
Isotherms are equal to what? → An isoline connecting all points of highest mean temperature.
What does primary circulation in the atmosphere entail? → Primary circulation entails global circulation - the mass movement of air all over the globe.
Describe the Subtropical High Pressure area. → The Subtropical High Pressure area consists of Westerlies, the Bermuda High, the Azores High, and the Pacific High.