Post on 11-May-2022
Ch 163 notes.notebook December 09, 2015
Feb 242:08 PM
1. Define wind and explain what causes it.
Wind is the horizontal movement of air from HIGH pressure to LOW pressure.
3. What causes differences in air pressure?
Unequal heating of the earth's surface causes temperature differences which cause pressure differences.
http://science.discovery.com/videos/deconstructedbarometer.html
Feb 242:41 PM
Unequal heating of earth's surface
Poles get indirect rays, equator gets direct rays
Dec 99:45 AM
Unequal Heating
Temperature Differences
Pressure Differences
Wind
Feb 243:20 PM
Higher temperatures (lighter air) cause lower air pressure
Lower temperatures (heavy air) cause higher air pressure.
Feb 258:33 AM
4. In what two ways do we describe wind?
By speed and direction. Ex 25mph westerly wind.
5. How do we determine wind direction? Explain
Wind direction is described as where the wind is coming from. For example a northerly wind blows from the north to the south.
Feb 258:37 AM
6. Toward what direction does a west wind blow?
To the east
7. What is the instrument used to measure wind speed? Describe how it works.
Wind speed is measured with an anemometer. Four cups are mounted on spokes. As the wind turns the spokes, a speedometer attached to the spokes measures the wind speed.
Ch 163 notes.notebook December 09, 2015
Feb 258:43 AM
8. Define wind chill.
Wind chill is increased cooling caused by higher wind speeds.The greater the wind, the lower the wind chill
Feb 258:46 AM
Feb 258:47 AM
Local Winds1. Define and give an example of a local wind.
Local winds blow over short distances. For example, land breezes and sea breezes.
2. What causes local winds?Local winds are caused by unequal heating of the surface over a small area.
Feb 258:50 AM
4 and 5 Sea breeze and land breeze.
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1903/es1903page01.cfm?chapter_no=visualization
Feb 258:51 AM
5. Describe a monsoon.
Sea and land breezes over a large area that change direction seasonally.
6. Compare and contrast summer and winter monsoons.
Summer=High pressure over the ocean, low pressure over land brings warm moist air over land. (Rainy season)
Winter=High pressure over the land, low pressure over the ocean causes winds to blow from land to water.(Dry season)
Mar 14:18 PM
LANDWATER
Ch 163 notes.notebook December 09, 2015
Feb 258:53 AM
Global Winds1. Define global winds.Winds that blow steadily over a long distance from specific direction.
2. Why is there unequal heating of the earth's surface?The angle in incoming solar radiation affect the temperature of the earth's surface.The more direct the rays, the hotter the surface.Equator is hottest; poles, coldest.
Feb 2511:57 AM
3. Explain global convection currents. What do they produce?Warm air rises at the equator and cold air sinks at the poles.Low pressure is created at the equator and high pressure is created at the poles.The movement of air from High to Low created global winds.
Feb 2511:58 AM
4. Describe the Coriolis effect.
As the earth rotates from east to west, global winds appear to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1904/es1904page01.cfm?chapter_no=visualization
http://www.youtube.com/watch?v=mcPs_OdQOYU
Feb 2512:07 PM
Polar Easterlies
Horse Latitudes
Prevailing Westerlies
Doldrums
Trade Winds
Feb 2512:14 PM
Doldrums: Areas of LOW pressure at the equator with little or no wind.
When sailing ships were stuck in the doldrums they drifted for days or weeks.
Feb 2512:18 PM
Horse Latitudes: Areas of High Pressure where cool air sinks at 30 degrees N and S of the equator
Due to the lack of wind,sailors ran out of food andwater when they got stuck in the horse latitudes and had to throw the horses overboard.
Ch 163 notes.notebook December 09, 2015
Feb 2512:24 PM
Trade Winds: Surface winds that blow from High to Low pressure between 30 degrees N and S toward the equator.
Feb 2512:25 PM
Prevailing Westerlies: Surface winds that blow from High to Low pressure between 30 degrees N and S and 60 degrees N and S.
Feb 2512:27 PM
Polar Easterlies: Surface winds that blow from high to low pressure between 90 degrees N and S and 60 degrees N and S.
Feb 2512:28 PM
Jet Stream: Upper level winds (10KM above the earth's surface the blow from East to West at speed of 400600 kph.Jet streams may wander N and S.
Mar 17:41 AM Dec 11:05 PM