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Transcript of Mesosphere
The mesosphere is situated between the stratosphere an the thermosphere and extends from 50km to 80-85km above the surface of Earth.
Where is it?
The mesosphere is the coldest of the atmospheric levels of our planet. As altitude increases, temperature decreases and in the highest parts of the layer it can be as cold as -100oC.
The mesosphere, combined with the stratosphere, are sometimes considered as a whole (middle atmosphere) because in both layers gasses of different kinds are mixed and there is no clear separation between their groups. To the contrary, in the thermosphere unlike gasses stay in groups, as they do not collide often and thus cannot mix up.
Mix of Gasses
The mesosphere is where most meteors "vaporize" and since some parts of them remain in it, it has a fairly high concentration of iron and other metal atoms. Because of them some clouds, called "polar mesospheric clouds" occasionally form at the Earth's poles and lead to lightning high above the thunderclouds that we often observe.
What happens in it?
There is not much information available about the mesosphere because it is very difficult to study. Some tests with sound rockets are being performed but they are too short to lead to clear conclusions. The layer is not used for many human purposes, as satellites are in the upper layer (the thermosphere) and airplanes and weather balloons cannot reach that altitude and stay in the troposphere and stratosphere.
This is because the air there is less dense and there are not as much molecules that can engross heat from the sun, as there are in the lower layers. Also, the constantly colliding CO2 molecules take away some of the energy while bouncing off.
Ivana Kafedjian &
Mesosphere's most important role is to protect the Earth from meteors. More than 40 tons of meteors burn up in this layer every year preventing enormous damages.
If the Mesosphere did not exist ....
Life on Earth would be impossible. We would all die because all the meteors that vanish in this layer will continue their way to our planet and will hit us. Our planet will start to burn and very soon there aren't going be almost any living creatures. That's why it is one of the most important
layers to save our existence.
THANK YOU FOR THE ATTENTION!
"Polar Mesospheric Clouds"
In the mesosphere near the poles the highest in altitude clouds are formed. Odd electrical discharges akin to lightning, called "Elves", appear dozens of kilometers (miles) above thunderclouds in the troposphere.