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By David H. Bromwich, Charles R. Stearns

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Published by way of the yankee Geophysical Union as a part of the Antarctic study Series.

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T h e high surface albedo results in a counterintuitive p r o c e s s : with increasing global radiation t h e net radiation is decreasing (see Figure 12). Loewe [1956] making m e a s u r e m e n t s in 1951/ 1952 at P o r t Martin, Adelie Coast, w a s t h e first to point this out. B o t h t h e s h o r t w a v e and the long-wave radia­ tion budget d e p e n d on cloudiness, the s h o r t w a v e budget increasing, the long-wave radiation budget decreasing TABLE 2. 6 D57 D80 Dome C with decreasing cloudiness.

While the individual radiation fluxes are large, t h e all-wave radiation b a l a n c e , or net radiation, is small in s u m m e r as t h e positive s h o r t w a v e radiation b u d g e t is nearly canceled b y a negative long-wave radiation b u d ­ get. In Table 4 t h e m e a n and e x t r e m e daily values a r e given for a 33-day period in s u m m e r for a station s o m e 100 k m from the edge of t h e c o n t i n e n t . Figure 14 s h o w s D10 Dome C JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Fig.

T h e general picture emerging from the wind profiles (Figure 20) is a p r o n o u n c e d low-level j e t in all profiles. T h e wind increases from the surface to a b o u t 120-200 m in height, depending on the time of t h e d a y , having t h e local m a x i m u m wind speed at that height. T h e n it d e c r e a s e s to a height of 800-900 m , w h e r e t h e local minimum of the wind speed is seen. F u r t h e r u p , t h e wind speed increases with height. T h e variations of the m e a n profiles of wind direction do not s h o w a distinguished diurnal p a t t e r n ; h o w e v e r , the change in wind direction is v e r y small in b o t h t h e b o u n d a r y layer and the free a t m o s p h e r e .

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