In fact, this warming is caused by ozone absorbing ultraviolet radiation. Warm air remains in the upper stratosphere, and cool air remains lower, so there is much less vertical mixing in this region than in the troposphere. The troposphere extends from the surface up to about 10 km in altitude, although this height varies with latitude. Almost all weather takes place in the troposphere. Mt. Everest, the highest mountain on Earth, is only 8.8 km high.
Temperatures decrease with altitude in the troposphere.
As warm air rises, it cools, falling back to Earth. This process, known as convection, means there are huge air movements that mix the troposphere very efficiently. UVA is not absorbed by ozone . UVB is mostly absorbed by ozone, although some reaches the Earth under normal conditions and even more will reach the surface because of ozone depletion . NASA provides more information on their web site .