Difference between revisions of "Airmass classification"

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<div class="definition"><div class="short_definition">A system used to identify and to characterize the different [[air masses]] according  to a basic scheme.</div><br/> <div class="paragraph">A number of systems have been proposed, but the [[Bergeron classification]] has been the most  widely accepted. In this system, air masses are designated first according to the [[thermal]] properties  of their source regions: [[tropical]] (T); [[polar]] (P); and less frequently, [[arctic]] or [[antarctic]] (A). For  characterizing the moisture distribution, air masses are distinguished as to [[continental]] (c) and  [[maritime]] (m) source regions. Further classification according to whether the air is cold (k) or  warm (w) relative to the surface over which it is moving indicates the low-level [[stability]] conditions  of the air, the type of modification from below, and is also related to the weather occurring within  the air mass. This outline of classification yields the following identifiers for air masses: cTk, cTw,  mTk, mTw, cPk, cPw, mPk, mPw, cAk, mAk, mAw; the last of which is never used. H. C. Willett,  in his classification, introduces further distinction between stable (s) and unstable (u) conditions  in upper levels. Some authors may include [[equatorial]] (E), [[monsoon]] (M), or [[superior air]] (S) in  their classifications. Others prefer to omit the arctic (A) type and describe all air masses on the  basis of polar and tropical air, separated by the [[polar front]].</div><br/> </div><div class="reference">Byers, H. R. 1944. General Meteorology.  p. 247. </div><br/> <div class="reference">Hewson, E. W., and R. W. Longley 1944. Meteorology, Theoretical and Applied.  p. 249. </div><br/> <div class="reference">Willett, H. C. 1944. Descriptive Meteorology.  183&ndash;191. </div><br/> <div class="reference">Palm&eacute;n, E. 1951. Compendium of Meteorology.  599&ndash;620. </div><br/>  
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<div class="definition"><div class="short_definition">A system used to identify and to characterize the different [[air masses]] according  to a basic scheme.</div><br/> <div class="paragraph">A number of systems have been proposed, but the [[Bergeron classification]] has been the most  widely accepted. In this system, air masses are designated first according to the [[thermal]] properties  of their source regions: [[tropical air|tropical]] (T); [[polar air|polar]] (P); and less frequently, [[arctic air|arctic]] or [[antarctic air|antarctic]] (A). For  characterizing the moisture distribution, air masses are distinguished as to [[continental air|continental]] (c) and  [[maritime air|maritime]] (m) source regions. Further classification according to whether the air is cold (k) or  warm (w) relative to the surface over which it is moving indicates the low-level [[stability]] conditions  of the air, the type of modification from below, and is also related to the weather occurring within  the air mass. This outline of classification yields the following identifiers for air masses: cTk, cTw,  mTk, mTw, cPk, cPw, mPk, mPw, cAk, mAk, mAw; the last of which is never used. H. C. Willett,  in his classification, introduces further distinction between stable (s) and unstable (u) conditions  in upper levels. Some authors may include [[equatorial air|equatorial]] (E), [[monsoon]] (M), or [[superior air]] (S) in  their classifications. Others prefer to omit the arctic (A) type and describe all air masses on the  basis of polar and tropical air, separated by the [[polar front]].</div><br/> </div><div class="reference">Byers, H. R. 1944. General Meteorology.  p. 247. </div><br/> <div class="reference">Hewson, E. W., and R. W. Longley 1944. Meteorology, Theoretical and Applied.  p. 249. </div><br/> <div class="reference">Willett, H. C. 1944. Descriptive Meteorology.  183&ndash;191. </div><br/> <div class="reference">Palm&#x000e9;n, E. 1951. Compendium of Meteorology.  599&ndash;620. </div><br/>  
 
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Latest revision as of 15:21, 25 April 2012



airmass classification

A system used to identify and to characterize the different air masses according to a basic scheme.

A number of systems have been proposed, but the Bergeron classification has been the most widely accepted. In this system, air masses are designated first according to the thermal properties of their source regions: tropical (T); polar (P); and less frequently, arctic or antarctic (A). For characterizing the moisture distribution, air masses are distinguished as to continental (c) and maritime (m) source regions. Further classification according to whether the air is cold (k) or warm (w) relative to the surface over which it is moving indicates the low-level stability conditions of the air, the type of modification from below, and is also related to the weather occurring within the air mass. This outline of classification yields the following identifiers for air masses: cTk, cTw, mTk, mTw, cPk, cPw, mPk, mPw, cAk, mAk, mAw; the last of which is never used. H. C. Willett, in his classification, introduces further distinction between stable (s) and unstable (u) conditions in upper levels. Some authors may include equatorial (E), monsoon (M), or superior air (S) in their classifications. Others prefer to omit the arctic (A) type and describe all air masses on the basis of polar and tropical air, separated by the polar front.

Byers, H. R. 1944. General Meteorology. p. 247.

Hewson, E. W., and R. W. Longley 1944. Meteorology, Theoretical and Applied. p. 249.

Willett, H. C. 1944. Descriptive Meteorology. 183–191.

Palmén, E. 1951. Compendium of Meteorology. 599–620.