TABLE 113. CONVENTIONAL INDEX OF ATMOSPHERIC TURBULENCE (MB/DAY) 



The average yearly computation of atmospheric turbulence varies still less from point to 

 point: from 4. 6 mb/day on Chetyryoldistolbovoi Island to 6. 2 mb/day in Yugorski Shar Straits. 



The data of the above table pertains to only one year. We may nevertheless observe that the 

 atmospheric turbulence is greater at stations west of Cape Chelyuskin than at stations east of it, 

 which fits perfectly into our conception of the agitating effect of Atlantic water. Further indication 

 is the fact that at all the stations shown, the minimum atmospheric turbulence was observed in the 

 summer (June to September); the maximum in the winter (December to February). 



Figure 167 shows the curve of the seasonal pattern of monthly many-year indices of atmos- 

 pheric turbulence on Dickson Island which I have computed for the time interval from 1916 through 

 1938. It is clear from the figure that the curve has two minimums. The first, or smallest, 

 occurs in January. In the Dickson region at this period, due to the homogenity of the underlying 

 surface (ice) and the absence of daily temperature change (polar night), more or less calm atmos- 

 pheric conditions are created. The second and considerably deeper minimum comes in July, 

 which is likewise explained by homogenity of conditions — water surface free of ice and polar day. 



In comparing data from individual years with the many year seasonal pattern of turbulence, 

 it appears that the general pattern of variability is basically preserved, but phase displacements 

 are observed in individual years, and this is reflected to a certain degree in ice conditions. 



As has already been noted, after the indices of atmospheric turbulence for the 1 day period, 

 month, season, or year have been computed and plotted on the geographical map, we may draw 

 the isolines of turbulence according to the data obtained. I have done this for the seas of the 

 Soviet Arctic for June and July of 1939 (figures 168 and 169). 



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