. Compendium of meteorology. Meteorology. Fig. 14.—500-mb chart over North America, 0300 GMT, November 4, 1946. Solid lines are contours of 500-mb surface, dashed lines are isotherms (degrees centigrade). of cold air as a result of isentropic exchange of air par- cels conserving their absolute angular momentum. This process would obviously result in a change in circula-. tion (increasing cyclonic vorticity in the central upper parts of the cold drop) similar to the vertical circula- tion outlined here. Quite different points of view have been expressed by Rossby [54] in his paper on the meridi
. Compendium of meteorology. Meteorology. Fig. 14.—500-mb chart over North America, 0300 GMT, November 4, 1946. Solid lines are contours of 500-mb surface, dashed lines are isotherms (degrees centigrade). of cold air as a result of isentropic exchange of air par- cels conserving their absolute angular momentum. This process would obviously result in a change in circula-. tion (increasing cyclonic vorticity in the central upper parts of the cold drop) similar to the vertical circula- tion outlined here. Quite different points of view have been expressed by Rossby [54] in his paper on the meridional movement of sinking cold domes. It seems obvious that the problem of the extreme meandering of the west-wind belt resulting in the formation of cold upper lows must be subjected to further investigations before the nature of the process can be regarded as completely clarified. The meandering of the belt of upper westerlies and the deformation of the upper polar front also result iia an increase of the amplitude of the warm upper ridges. In extreme cases a warm ridge can be completely sepa-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F. Boston : American Meteorological Society
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