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polar-front jet stream
polar-front jet stream The jet stream that is observed in different positions over middle and higher latitudes at heights of 10–13 km, and is associated with the boundary zone between polar and tropical air above the polar front. Maximum velocity averages 60 m/s, but can be twice this in extreme cases. The jet is typically discontinuous but at times can extend almost around the globe. It is more persistent in winter in response to the stronger temperature gradient between north and south than in summer. The jet is related to the development of surface frontal depressions of middle latitudes.
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Cite this article
MICHAEL ALLABY. "polar-front jet stream." A Dictionary of Ecology. 2004. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "polar-front jet stream." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O14-polarfrontjetstream.html MICHAEL ALLABY. "polar-front jet stream." A Dictionary of Ecology. 2004. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-polarfrontjetstream.html |
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polar-front jet stream
polar-front jet stream The jet stream observed in different positions over middle and higher latitudes at heights of 10–13 km, and associated with the boundary zone between polar and tropical air above the polar front. Maximum velocity averages 60 m/s, but can be twice this in extreme cases. The jet is typically discontinuous but at times can extend almost around the globe. It is more persistent in winter in response to the stronger temperature gradient between north and south than in summer. The jet is related to the development of surface frontal depressions of middle latitudes.
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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "polar-front jet stream." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "polar-front jet stream." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O13-polarfrontjetstream.html AILSA ALLABY and MICHAEL ALLABY. "polar-front jet stream." A Dictionary of Earth Sciences. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-polarfrontjetstream.html |
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