Dear Gargi,

The tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere.

Going upward from the surface, it is the point where air ceases to cool with height, and becomes almost completely dry. More formally, the tropopause is the region of the atmosphere where the environmental lapse rate changes from positive, as it behaves in the troposphere, to the stratospheric negative one. Following is the exact definition used by the World Meteorological Organization:

The boundary between the troposphere and the stratosphere, where an abrupt change in lapse rate usually occurs. It is defined as the lowest level at which the lapse rate decreases to 2 °C/km or less, provided that the average lapse rate between this level and all higher levels within 2 km does not exceed 2 °C/km.[1]

The tropopause occurs at approximately 20,000 feet over the poles and at approximately 60,000 feet above the equator. The International Standard Atmosphere assumes that the average height of the tropopause is 36,000 feet.

[1]  International Meteorological Vocabulary (2nd ed.). Geneva: Secretariat of the World Meteorological Organization. 1992. p. 636. ISBN 92-63-02182-1.

Hoping this will be helpful,

Rafik

Thanku so much Sir.....for this valuable information. Sir, one more query which I want to ask is, that I have temperature data, will it be sufficient to calculate "Tropopause height"??

Thanks & Regards

Dear Gargi,

Temperature data should be accompanied with height data.

Rafik 

Dear Michael,

I have cited the original paper.

Rafik

the lowest temperature level determine the height of the Tropopause Layer.

Thanku Neeraj for your kind help.....!!!

Regards