
1) Atmospheric boundary 2) Layer
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https://www.crosswordclues.com/clue/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 ....
Found on
http://en.wikipedia.org/wiki/Tropopause

The boundary layer between the troposphere and stratosphere, where an abrupt change in temperature lapse rate usually occurs. It is defined as the lowest level at which the lapse rate decreases to 2
Found on
http://nsidc.org/arcticmet/glossary/tropopause.html

The level separating the troposphere and the stratosphere, occurring at an altitude of 5-10 miles.
Found on
http://www.braeunig.us/space/glossary.htm

(from the article `weather forecasting`) One weakness common to virtually all satellite-borne sensors and to some ground-based radars that use UHF/VHF waves is an inability to measure thin ... [6 related articles]
Found on
http://www.britannica.com/eb/a-z/t/84

The boundary in Earth`s atmosphere between the troposphere and the stratosphere. Its height is about 15-17 km over the tropics and 10 km nearer the poles, but it varies seasonally and with changes in weather.
Found on
http://www.daviddarling.info/encyclopedia/T/tropopause.html

the upper boundary of the troposphere
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-05-02

Boundary between the upper troposphere and the lower stratosphere that varies in altitude between approximately 8 km at the poles to 18 km at the equator.
Found on
http://www.encyclo.co.uk/local/20130

The boundary between troposphere and the stratosphere. It is usually characterized by an abrupt change in temperature with height from positive (decreasing temperature with height) to neutral or negative (temperature constant or increasing with height).
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http://www.encyclo.co.uk/local/22268

The tropopause is a relatively thin atmospheric transition layer found between the troposphere and the stratosphere. The height of this layer varies from 8 to 16 kilometers above the Earth's surface.
Found on
http://www.physicalgeography.net/physgeoglos/t.html

[
n] - the region of discontinuity between the troposphere and the stratosphere
Found on
http://www.webdictionary.co.uk/definition.php?query=tropopause

the boundary layer between the troposphere and stratosphere , where an abrupt change in temperature lapse rate usually occurs; it is defined as the lowest level at which the lapse rate decreases to 2 degrees Celsius per kilometer or less, provided that the average lapse rate between this level and all higher levels within 2 kilometers does not exc...
Found on
https://nsidc.org/cryosphere/glossary?page=27

The boundary between the troposphere and the stratosphere (about 8 km in polar regions and about 15 km in tropical regions), usually characterized by an abrupt change of lapse rate. The regions above the troposphere have increased atmospheric stability than those below. The tropopause marks the vertical limit of most clouds and storms.
Found on
https://www.encyclo.co.uk/local/20128

The narrow region separating the troposphere and the stratosphere. More information here..
Found on
https://www.encyclo.co.uk/local/20751

The region of the atmosphere between the stratosphere and the troposphere.
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https://www.encyclo.co.uk/local/20784
noun the region of discontinuity between the troposphere and the stratosphere
Found on
https://www.encyclo.co.uk/local/20974

The boundary between the troposphere and stratosphere found between 8 to 20 km in altitude. The tropopause is higher over the tropics and lowest in the polar regions. It is characterized by an abrupt increase in temperature (the stratospheric temperature inversion). The tropopause generally marks the vertical limit of most clouds and storms.
Found on
https://www.encyclo.co.uk/local/21131
No exact match found.