106 



WIND. 



Table 60. 

 Frequency of Winds of Different Velocities, per cent. 



For comparison' with th(3 curves Eor the stations near the Antarctic Continent, the wind 

 observations made at Kerguelen were examined. This .station, although near to the Antarctic, 

 is certainly under the influence of frequent and deep cyclones. The frequency curve for this 

 station is also shown on figure 3-5. It is most strongly of the cyclonic type, the first group 

 containing only 11 per cent, of the observations, and the maximum frequency does not occur 

 before the fifth group wdth wand velocities from 20 to 24 miles an hour. 



The frequencv curves have not been calculated for other stations than those discussed 

 in this section, but it is very unlikely that two curves could be more widely different than 

 those for Cape Adare and Kerguelen, which are both marine stations on the same ocean. 



Although all the curves for the true Antarctic Stations are of the anticvelonic type they 

 show most instructive differences. The curves for Cape Adare and Framheim are .similar to 

 those for Jubbulpore during the winter, they all decrease rapidly and regularly from their 

 maximum. The curve for Snow Hill is somewhat different : it has the maxinnim in the first 

 .group, but the maximum is only 20 per cent, of the whole and the curve decreases very 

 slowly although regularly. A curve of the simple anticyclonic type with 4.3 per cent, of the 

 wincfe of a greater velocity than 20 miles an hour mu.st be very unusual. The curve for 

 the Gauss Station shows a depai-t.ure from the simple anticyclonic type. In.stead of decreasing 

 regularlv from the maximum the curve decreases at fir.st fairly rapidly and then after the 

 third group much more slowly so that the curve has an upward bulge between the third 

 and the seventh groups showing that the frequency of the winds between 15 and 30 miles 

 an hour is greater than they would be at a place having the same mean velocity and the 

 anticyclonic type of frequency. This anomaly is much more marked at Cape Evans in fact 

 after the fourth group, the frequency actually increases to the sixth group after w'hich it 

 decreases even more slowly than the curve for Snow Hill. Framlieim is about three hundred 

 miles to the east and Cape Adare is nearly the same distance to the north of Cape Evans. 

 Yet neither of these stations shows the anomaly which is so strongly marked at Cape Evans. 

 There is obviously at Cape Evans and to a lesser extent at the Gauss Station some factor 

 affecting the winds other than the simple anticyclonic distribution of pressure. 



