. Compendium of meteorology. Meteorology. 554 THE GENERAL CIRCULATION inferred from the classical work of Dines [18] in which was pointed out the good correlations between tem- perature and pressure in mid-troposphere and at the tropopause. The strength of the circumpolar whirl is diminished with decreasing elevation. Below the level of 700 mb the circumpolar vortex begins to be somewhat obscured by the appearance of a more cellular character of the general circulation, and by the time we reach maps at sea level (Figs. 5 and 6) the "centers of action" take on considerable cellular ch
. Compendium of meteorology. Meteorology. 554 THE GENERAL CIRCULATION inferred from the classical work of Dines [18] in which was pointed out the good correlations between tem- perature and pressure in mid-troposphere and at the tropopause. The strength of the circumpolar whirl is diminished with decreasing elevation. Below the level of 700 mb the circumpolar vortex begins to be somewhat obscured by the appearance of a more cellular character of the general circulation, and by the time we reach maps at sea level (Figs. 5 and 6) the "centers of action" take on considerable cellular character. Noteworthy is the emergence of easterly winds north of the subpolar lows and in the subtropics. The easterlies of the polar regions are for the most part shallow phenomena gen- erally below 3 km, but in low latitudes, particularly in summer, easterly winds are very deep and extend well into the stratosphere. The circumpolar vortex in the upper troposphere and lower stratosphere, while primarily zonal in character, undergoes gentle north-south undulations so that the isobars have a roughly sinusoidal character. The ridges and troughs aloft have their reflections at the surface. 1 90° 60° so° 40° 30° LAT i]j25 §20 to £io N ^ "" ' ' Fig. 5.—Normal pressure distribution at sea level (below) and normal contours at 700 mb (above) for January. Profiles inserted. Dashed lines at 700 mb are isotherms for every five centigrade degrees. JULY Fig. 6.—Normal pressure distribution at sea level (below) and normal contours at 700 mb (above) for July. Profiles inse' 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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