Murgatroyd, R. J. Meteorological Office, Bracknell, United Kingdom.
Last reviewed:December 2019
- Related Primary Literature
- Additional Reading
The boundary between the troposphere and the stratosphere in the atmosphere. The tropopause is broadly defined as the lowest level above which the lapse rate (decrease) of temperature with height becomes less than 6°F/mi (2°C/km). In low latitudes the tropical tropopause is at a height of 9–10.5 mi or 15–17 km (−135°F or 180 K) and the polar tropopause between tropics and poles is at about 6 mi or 10 km (−63°F or 220 K). There is a well-marked “tropopause gap” or break where the tropical and polar tropopause overlap at 30–40° latitude. The break is in the region of the subtropical jet stream and is of major importance for the transfer of air and tracers (humidity, ozone, radioactivity) between stratosphere and troposphere. Tropopause breaks also occur in the neighborhood of polar jet streams. The height of the tropopause varies seasonally and also daily with the weather systems, being higher and colder over anticyclones than over depressions. The detailed vertical temperature structure is often complex, showing multiple or laminated tropopauses and it is often difficult to decide on the precise height of the tropopause, particularly in winter at high latitudes. See also: Air temperature; Atmosphere; Radio-wave propagation; Stratosphere; Troposphere
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 10,000 highly qualified scientists and 45 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information