tropopauzën

Tropopause is the boundary layer between the troposphere and the stratosphere, the two lowest layers of Earth's atmosphere. It is characterized by a sharp change in lapse rate, the rate at which temperature decreases with altitude. In the troposphere, the lapse rate is approximately 6.5 degrees Celsius per kilometer, while in the stratosphere, it increases with altitude. The tropopause is typically found at an altitude of about 11 kilometers (7 miles) in the tropics and 17 kilometers (11 miles) in the polar regions.

The tropopause is not a fixed altitude but varies with latitude, season, and weather conditions. It is higher in the tropics due to the intense solar heating and lower in the polar regions due to the lack of solar heating. The tropopause also varies with the seasons, being higher in summer and lower in winter.

The tropopause plays a crucial role in weather and climate. It acts as a barrier to the vertical mixing of air, separating the well-mixed troposphere from the more stable stratosphere. It also influences the distribution of ozone in the atmosphere, with most of the ozone being found in the stratosphere above the tropopause.

The tropopause is not a physical boundary but a transition zone where the properties of the atmosphere change rapidly. It is defined by the World Meteorological Organization as the lowest level at which the lapse rate decreases to 2 degrees Celsius per kilometer or less, provided that the average lapse rate between this level and all higher levels within 2 kilometers does not exceed 2 degrees Celsius per kilometer.