. Compendium of meteorology. Meteorology. 586 MECHANICS OF PRESSURE SYSTEMS but the cause of such an increase of gradient wind is not necessarily attributable to the frontal mechanism. Whenever VxdVg/dx + dvg/dt has the same sign in each of the two air masses, v, will also have the same sign in the whole field; but its maximum numerical the line of maximum \v,,\ . In the stratosphere the terms downgliding and upgliding must be interchanged, because of the opposite tilt of isentropic surfaces, but the statement about the isentropic divergence remains identical for stratosphere and troposphere.
. Compendium of meteorology. Meteorology. 586 MECHANICS OF PRESSURE SYSTEMS but the cause of such an increase of gradient wind is not necessarily attributable to the frontal mechanism. Whenever VxdVg/dx + dvg/dt has the same sign in each of the two air masses, v, will also have the same sign in the whole field; but its maximum numerical the line of maximum \v,,\ . In the stratosphere the terms downgliding and upgliding must be interchanged, because of the opposite tilt of isentropic surfaces, but the statement about the isentropic divergence remains identical for stratosphere and troposphere. At the line » -60*. ISOmb 200 300 t= 400 500 600 fe-— "x"^^-- 0»-700 35»N eoo 900 1000 700 800 ^="—i290r-900 ,»'000 40» I 3? 10" sec' Fig. 7.—Meridional profiles through a model of straight westerlies with quasi-stationary polar front (Palmen and Newton [24]). Left: Dashed lines show isotherms (degrees centigrade), and solid lines isovels (m see"') of zonal geostrophic wind. Right: Dashed lines show the field of dry-isentropes (degrees absolute), and the saturation-isentrope of 281° in the frontal zone. Solid lines represent the quantity 2^2 — dvg/dti in units of 10"^ sec"'.. 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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