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tropopause
The tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere.
==Definition==
Going upward from the surface, it is the point where air ceases to cool with height, and becomes almost completely dry. More formally, the tropopause is the region of the atmosphere where the environmental lapse rate changes from positive, as it behaves in the troposphere, to the stratospheric negative one. Following is the exact definition used by the World Meteorological Organization:
The tropopause as defined above renders as a first-order discontinuity surface, that is, ''temperature'' as a function of height varies continuously through the atmosphere but the ''temperature gradient'' does not.
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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