5 Written questions
5 Matching questions
- What does primary circulation in the atmosphere entail?
- Describe the Equatorial Low Pressure.
- Isotherms are equal to what?
- Describe the Polar High Pressure area.
- What are the four major pressure areas on Earth?
- a Equal temperature.
- b Primary circulation entails global circulation - the mass movement of air all over the globe.
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).
- d The Equatorial Low Pressure area occurs along the Intertropical Convergence Zone (ITCZ) and is the area where the Trade Winds and doldrums occur.
- e The Polar High Pressure consists of polar easterlies and the Antarctic High pressure area.
5 Multiple choice questions
- High pressure cells tend to descend and diverge.
- The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.
- 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.
- Secondary circulation consists of the migration of high and low pressure cells. Major pressure cells move from high pressures to lower pressures, bringing with them fluctuations of temperature and moisture, causing climate.
- 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.
5 True/False questions
Isotach? → Equal pressure.
Isobar? → Equal wind speed.
What do low pressure cells tend to do? → Low pressure cells tend to ascend and converge.
Describe land-sea breezes. →
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.
Explain pressure gradients. → 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.