* Nitrogen (N2): About 78% of the mesosphere is nitrogen.
* Oxygen (O2): About 21% of the mesosphere is oxygen.
However, the concentration of these gases is significantly lower in the mesosphere compared to lower layers. This is because:
* Density decreases: As altitude increases, the air becomes thinner, leading to lower density in the mesosphere.
* Chemical processes: The mesosphere is also the region where some chemical reactions involving oxygen occur, converting it to atomic oxygen (O).
While the mesosphere is primarily nitrogen and oxygen, there are trace amounts of other gases:
* Carbon dioxide (CO2): A greenhouse gas present in small amounts.
* Argon (Ar): An inert gas.
* Ozone (O3): While the ozone layer is primarily in the stratosphere, some ozone exists in the mesosphere.
It's important to note that the composition of the mesosphere can be influenced by factors like solar activity and seasonal variations.
