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mesosphere : ウィキペディア英語版
mesosphere

The mesosphere (; from Greek ''mesos'' "middle" and ''sphaira'' "ball") is the layer of the Earth's atmosphere that is directly above the stratopause and directly below the mesopause. In the mesosphere temperature decreases as the altitude increases. The upper boundary of the mesosphere is the mesopause, which can be the coldest naturally occurring place on Earth with temperatures below . The exact upper and lower boundaries of the mesosphere vary with latitude and with season, but the lower boundary of the mesosphere is usually located at heights of about above the Earth's surface and the mesopause is usually at heights near , except at middle and high latitudes in summer where it descends to heights of about .
The stratosphere, mesosphere and lowest part of the thermosphere are collectively referred to as the "middle atmosphere", which spans heights from approximately to . The mesopause, at an altitude of , separates the mesosphere from the thermosphere—the second-outermost layer of the Earth's atmosphere. This is also around the same altitude as the turbopause, below which different chemical species are well mixed due to turbulent eddies. Above this level the atmosphere becomes non-uniform; the scale heights of different chemical species differ by their molecular masses.
==Temperature==
Within the mesosphere, temperature decreases with increasing height. This is due to decreasing solar heating and increasing cooling by CO2 radiative emission. The top of the mesosphere, called the mesopause, is the coldest part of Earth's atmosphere. Temperatures in the upper mesosphere fall as low as , varying according to latitude and season.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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