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Atmosphere- a blanket of air that surrounds the earth
Function of the atmosphere
1. It insulates us so that we don’t freeze at night.
2. Its ozone layer protects us from the sun’s ultraviolet rays.
3. It also contains the carbon dioxide needed by plants for photosynthesis, and the oxygen we need to breathe.
Layers of the atmosphere

Troposphere • Layer closest to the Earth. • Where all weather occurs • The higher you go in the Troposphere the colder it gets. • The only layer of the atmosphere where life is possible. • Extends 5-10 kms up from the Earth’s surface.

Stratosphere • Second layer of the atmosphere. • Extends from 10-50 kms above the Earth’s surface. • Temperatures remain fairly constant. • Very calm.....NO WEATHER! • Special form of oxygen-OZONE, which protects us from harmful UV rays. • Planes fly here, birds do not!

Mesosphere ❑ Air here is very cold and thin ❑ Extends to a height of 80 kms ❑ Meteorites are burnt out at this layer

Thermosphere • Found between 80 km and 700 kms • Space shuttles fly in this area. • Aurora lights are found here

Terms to remember ▪ Meteorology - is the study of the entire atmosphere including weather ▪ Weather - is the present state of the atmosphere at a specific time and place. ▪ Weather forecast – the prediction about the weather that will be experienced a short period of time in the future

3 factors that affect tha weather a. Air pressure ความกดอากาศ It is the weight of the air above the given point Barometer – measures the air pressure

b. Humidity ความชื้น The amount off water vapor present in the air. Hygrometer – instrument used to measure relative humidity

c. temperature อุณหภูมิ Is a measure of how hot or cold the air is Maximum minimum thermometer – used to measure air temperature

▪ Temperature is inversely proportional to atmospheric pressure. When the temperature is high, the atmospheric pressure is lower or vice versa

[pic] 3 typical weather phenomena in Asia ▪ 1. Monsoon- A wind system that influences large climatic regions and reverses direction seasonally.

▪ 2. Tropical cyclones - Large rotating area of clouds, wind and thunderstorm activity ▪ 3. thunderstorm - Characterized by the presence of lightning and thunder [pic][pic][pic]
Weather and Atmosphere

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