Kotaro YOKOYAMA

Shunichi KOBAYASHI

National Institute of Polar Research Repository

2. Measurements of Drifting Snow on the Route between Syowa Station and Mizuho Camp, 1973 Shun'ichi KO BAY AS HI* and Kotaro YOKOYAMA** Drifting snow occurs perpetually in such a strong katabatic slope as Mizuho Plateau. Measurements of snow transport under different wind regime are very important to the studies of the snow cover formation and mass budget of the ice sheet. To measure the amount of drifting snow under the severe conditions in Mizuho Plateau, a handy collector, a chest with 10 drawers, was devised (Kobayashi, 1975). The collector with collection efficiency of about 0.23 can measure the mass flux at ten levels up to 1 m above the surface. Measurements of snow transport were made at the following three stations. Wind speed profiles were measured at the same time. Station Latitude Longitude Altitude (S ) (E) (meters) Mizuho Camp 70°41.9' 44°19.9' 2,230 260 70°24. 3' 43°50.5' 2,100 H90 69°15. 5' 41 °14.6' 1,260 The annual net accumulation at Mizuho Camp, 260 and H90 in 1973 was about 10 cm, 5 cm, and 30 cm in snow, respectively ( Yokoyama, 1975). The amount of snow drift at H90 was much larger than at other two sites. Data of mass flux at various heights were listed in Table 1 together with the wind speed at 1 m height. References Kobayashi, S. ( 1975 ): Saikuron-kata jifubuki-kei to hikidashi-kata jifubuki­kei no hikaku ( A comparison between cyclone-type and chest-of-drawer­type drift collectors ). Teion Kagaku ( Low Temp. Sci.), Ser. A, 32, 89 - 95. Yokoyama, K. ( 1975 ): Net accumulation by stake measurements. JARE Data Rep., 28 ( Glaciol. ), 62 - 82. * The Institute of Low Temperature Science, Hokkaido University, Sapporo 060 ** Disaster Prevation Research Institute, Kyoto University, Uji 611. -154-..... CJl CJl Observation Station Date No. 1 Mizuho 1 7 Ap r, Camp 2 II l 8 Apr. 3 II 21 Apr. 4 " 22 Apr. 5 Z60 26 Apr. 6 II II 7 H90 28 Apr. 8 II II 9 II II l 0 ,, " I 1 Mizuho 8 Sep. Camp 1 2 II 1 7 Sep. 1 3 H II 1 4 II 18 Sep. 1 5 II 19 Sep. 1 6 II 21 Sep, 1 7 N 22 Sep. Table 1. Mass flux (g • m-2 • sec· 1) of drifting snow and data of wind. Ti me of Mass flux(g·m-� · sec- 1) of various heights(cm) exposure ( min ) 0-5 10-1 5 20-25 30-35 40-45 50-55 G0-65 70-75 80-85 33 233 4 7 l 8 1 I 7 I l 9 3 3 30 222 166 88 55 23 33 23 I 6 I 6 32 262 87 78 42 23 48 3 I 30 l 7 32 267 105 63 42 23 ') -- ,) l 8 I 1 1 4 49 1 3 9 33 J 0 6 4 5 1 2 1 30 188 77 48 28 22 20 l 6 1 5 1 0 30 477 352 2 5 7 2 5 5 253 250 250 2 4 1 2 3 1 II 497 294 290 255 245 239 236 236 2 3 I II 390 332 294 253 244 2 4 1 235 233 233 II 372 292 32 9 2 76 254 250 237 237 233 30 226 1 2 1 1 9 28 1 9 1 9 1 2 I 1 ·18 II 2 2 7 102 I 4 6 I 8 18 I 6 I 3 I 2 II 164 68 I 9 I 6 1 4 1 5 1 0 9 l 0 II 109 33 20 7 l 0 I 0 6 6 6 II 24 2 4 5 3 i 4 5 3 4 II 21 7 1 1 6 68 ,t 4 25 1 7 I 6 l 3 I 4 II I 5 s 1 6 I 3 2 2 2 * Th e values of mas s  f lux cor rect ed by th e value of co llection effici ency 0.23 . Wind speed Friction Roughness at 1 m, velocity, pararmiter, 90-95 U1 (J1Vs) th ( crrvs) Zo (cm) 3 I 0.5 5 3.9 0.04 I 9 I 2.5 6 9.6 0.0 6 5 I 5 l 3.5 7 4.8 0.0 7 2 1 7 l 1.0 6 4.3 0.0 9 2 2 1 1.0 - -1 0 II 2 2fi l 2.0 7 1.3 0.8 2 229 II II II 2 31 II II II 236 II II II 1 5 l 2.0 5 5.7 0.0 33 1 4 1 2.:3 7 3.0 0.1 0 1 2 1 1. () 7 1.3 0.1 0 9 8.5 5 7.4 0.2 5 3 6.5 5 7.4 0.80 1 2 9.5 5 3.9 0.0 4 2 7.0 S 3.� 0.4 5 

2. Measurements of Drifting Snow on the Route between Syowa Station and Mizuho Camp, 1973 (III. SURFACE METEOROLOGICAL DATA)

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2. Measurements of Drifting Snow on the Route between Syowa Station and Mizuho Camp, 1973 (III. SURFACE METEOROLOGICAL DATA)

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