All weather phenomena occur within the troposphere, although turbulence may extend into the lower portion of the stratosphere. The stratosphere is the second major strata of air in the atmosphere. Then it increases gradually to up to the stratopause . Because the air temperature in the stratosphere increases with altitude, it does not cause convection and has a stabilizing effect on atmospheric conditions in the region. Ozone plays the major role in regulating the thermal regime of the stratosphere, as water vapor content within the layer is very low.
Temperature increases with ozone concentration.
Solar energy is converted to kinetic energy when ozone molecules absorb ultraviolet radiation, resulting in heating of the stratosphere. These wavelengths are harmful to life because they can be absorbed by the nucleic acid in cells. Increased penetration of ultraviolet radiation to the planet's surface would damage plant life and have harmful environmental consequences. Appreciably large amounts of solar ultraviolet radiation would result in a host of biological effects, such as a dramatic increase in cancers. The coldest temperatures in Earth's atmosphere occur at the top of this layer, the mesopause , especially in the summer near the pole.