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Atmosphere
The atmosphere is composed of gases, vapour, and particulates that surround the Earth. It is divided into four main layers: 1) The troposphere, the lowest layer where weather occurs, decreases in temperature with height up to 16km. 2) The stratosphere temperature increases up to 50km where the ozone layer is located. 3) The mesosphere temperature decreases again up to 80km. 4) The thermosphere is the outermost layer where temperature rapidly increases with altitude up to 640km and beyond.
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Atmosphere
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- 2. ATMOSPHEERE – Theatmosphere is a thick gaseous envelope which sorrounds the earth from all sides and is attached to the earth`s surface by gravitational force.
- 3. The atmosphere is composedof – 1. Gases 2. Vapour 3. Particulates
- 4. Structure of the atmosphere structurallyatmosphere is divided into 4 parts . 1.Troposphere 2.Stratosphere 3.Mesosphere 4.Thermosphere
- 5. 1. TROPOSPHERE- • Lowermostlayer with all weather phenomenon. • Temperature decreases with increasing height at the rate of 6.5*/km, is called normal lapse rate. • The average height of the troposphere changes from equator towards poles (decreases). • Average height of tropsphere is about 16km. TROPAUSE - • Upper limit of the troposphere is called tropause. • Tropause is about 1.5 km thick. • Troposphere is called zone of mxing while •The tropause is called zone of mixing stop.
- 6. 2. STRATOSPHERE - •Above the tropopause with less weather phenomenon. • Temperature increases and becomes 0*c at 50km. • It is divided into two parts ozonosphere (17-35km ) an dremaining part (35-50). STRATOPAUSE - • Upper limit of the tstratosphere is called stratopause.
- 7. 3. MESOOSPHERE - •Temp. starts decreasing and becomes -80* at it`s upper limit. • It extends between 50-80 km. MESOPAUSE - • Upper limit of the mesosphere is called mesopause.
- 8. 4. THERMOSPHERE- • Temperatureincreases rapidly and becomes 1700*c at it`s upper limit. • In this region we are unable to measure the temperature by ordinary thermometer because of extremely low density. • Extends from 80-640km. • In the ionosphere we found D(60-99km), E(99-150),F (150-380)& G (400-above) layers. IONOSPHERE - EXOSPHERE - • This is the uppermost layer extending beyond 640km