5 Written questions
5 Matching questions
- Isotherms are equal to what?
- What is the rule for naming winds?
- Describe land-sea breezes.
- Describe friction forces.
- Describe the Coriolis Effect.
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.
- b 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.
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.
- d Equal temperature.
The Coriolis Effect deflects winds fro ma straight line in relation to the Earth's rotating surface. Earth's rotation adds the Coriolis Effects and a "twist" to air movements. In the Northern Hemisphere, winds are deflected to the right, or the east. In the Southern Hemisphere, winds are deflected to the left, or the west.
5 Multiple choice questions
- Equal wind speed.
- Primary circulation entails global circulation - the mass movement of air all over the globe.
- An isopleth is a line on a weather chart that represents an equal value of some quantity.
- The four factors that affect atmospheric circulation are as follows: the Coriolis Effect, gravity, friction forces, and changes in air pressure.
- 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
Isobar? → Equal wind speed.
Isoheight or contour line is what? → Equal temperature.
What do low pressure cells tend to do? → Low pressure cells tend to ascend and converge.
Describe the Subpolar Low Pressure area. → The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.
What does tertiary circulation in the atmosphere entail? → Primary circulation entails global circulation - the mass movement of air all over the globe.