Post on 15-Jul-2015
What can cause the changes of weather?
• Weather variables:
1) Temperature
2) Wind
3)Moisture
4)Precipitation
What is the angle of insolation?
• a measure of how high the sun is in the sky • measured from the horizon up to the position of the sun
What happens as the angle increases or decreases?
• As the angle of insolation increases, intensity increases. (heat concentrated in smaller area.)
Low angle: Less absorbedHigh angle: More absorbed
• Intensity of insolation varies over the Earth because of the curvature of the Earth.
Earth
Where is intensity the greatest and lowest?
• Intensity greatest near the Equator.
– Sun’s rays are direct
• Intensity low at the poles
At what time is the angle and intensity of insolation greatest?
•The noon sun has the greatest angle of insolation.
Why does the angle of insolation change between midday and
evening?
The angle of insolation decreases because the Earth’s rotation ,and the air temperature usually decrease