According to Reichler et al, changes in wind patterns known as polar vortices in this area can cause a shift in deep sea circulation. During the winter, PSCs can be found in this area, which is also where blue jets reside. This area gets its name from a characteristic which is caused by the breakdown of ozone into atomic and diatomic oxygen in the presence of UVB and UVC radiation. These reactions cause this area to be warmer towards the top and colder towards the bottom, at an area called the tropopause. Aircraft often reach the lower levels of this atmospheric layer. For 10 points, identify 
According to Reichler et al, changes in wind patterns known as polar vortices in this area can cause a shift in deep sea circulation. During the winter, PSCs can be found in this area, which is also where blue jets reside. This area gets its name from a characteristic which is caused by the breakdown of ozone into atomic and diatomic oxygen in the presence of UVB and UVC radiation. These reactions cause this area to be warmer towards the top and colder towards the bottom, at an area called the tropopause. Aircraft often reach the lower levels of this atmospheric layer. For 10 points, identify this atmospheric layer that lies above the troposphere.
According to Reichler et al, changes in wind patterns known as polar vortices in this area can cause a shift in deep sea circulation.
Stratosphere