Renji NARUSE

ナルセ レンジ

National Institute of Polar Research Repository

XI. DENSITY AND HARDNESS OF SNOW IN MIZUHO PLATEAU IN 1969 - 1970 Renji NARUSE * In the previous report (Naruse, 1972), the result of the stratigraphic observation of the surface snow cover was given only by graphical descrip­tions. For the sake of convenience for calculation, numerical data of density and hardness of snow measured by JARE-10 in 1969 - 1970 are given in Tables 1 and 2. Reference Naruse, R. 0972): Stratigraphic observation of the surface snow cover in Mizuho Plateau, East Antarctica, 1969 - 1970. JARE Data Rep., 11. (Glaciology), 77 - 87. Table 1. Snow density of the surface snow cover in Mizuho Plateau Station S20 530 in 1969 - 1970. Level (cm) 3 - 10 22 - 30 45 - 51 64 - 70 83 - 90 100 - 104 110 - 115 125 - 130 140 - 146 155 - 164 170 - 176 185 - 190 200 - 206 4 - 10 15 - 28 40 - 51 55 - 75 77 - 100 Density (g/ cm9 ) 0.49 0.45 0.43 0.45 0.44 0.62 0.47 0.50 0.46 0.48 0.51 0.50 0.52 0.40 0.38 0.43 0.42 0.46 Station Level (cm) S35 0 - 8 10 - 18 21 - 31 35 - 45 49 - 60 64 - 79 83 - 95 540 l - '8. 7 12 - 20.9 22 - 31.6 32 41.7 42 - 51.7 52 60.1 65 - 72.7 85 - 92.5 95 - 110.0 110 - 121 .1 125 - 133 .9 Density (}2./ cm3 ) 0.44 0.39 0.39 0.42 0.44 0.45 0.47 0.40 0.42 0.42 0.41 0.42 0.44 0.43 0.44 0.44 0.49 0.45 * The Institute of Low Temperature Science, Hokkaido University, Sapporo. -180-Station S40 Level (cm) 140 - ·148 . .3 149 - 164 .8 165 - 179.4 180 - 193 .4 198 - 220 .4 222 - 239 .4 240 - 260 .0 260 - 279,3 280 - 298 .8 304 - 324 .4 328 - 348 .0 348 - 367. 7 368 - 387 .2 388 - 393.2 398 - 417. 6 418 - 438 .2 442 - 458 .0 458 - 470.4 474 - 492.9 494 - 512 .2 520 - 538 .2 544 - 555 .o 555 - 575 .0 575 - 597.8 603 - 621.8 622 - 640.6 641 - 659 .4 663 - 674.8 680 - 700.0 700 - 716.9 718 - 736 .3 737 - 753 .4 758 - 765 .4 770 - 788 .0 792 - 804.7 805 - 814 .1 815 - 831. 0  Density (g./ cmi) Station 0.44 S40 0.45 0.49 0.48 0.46 a.so 0.49 0.51 0.51 0.51 0.52 S45 0.51 0.49 a.so 0.52 0.52 0.56 0.56 0.53 0.54 0.54 S55 0.56 0.56 0.56 0.56 0.57 S60 0.55 0.56 0.56 0.54 0.56 0.56 S65 0.56 0.57 0.58 0.57 0.56 - 181 -Level Density (cm) ('1./ cm11 ) 833 - 846 .s 0.58 850 - 864.5 0.60 865 - 872 .1 0.57 878 - 891. 7 0.59 892 - 905 .2 0.59 908 - 927 .2 0.58 928 - 945 .4 0.57 947 - 963 .6 0.59 968 - 980.2 0.61 981 - 991.3 0.59 2 - 6 0.37 9 - 17 0.47 18 - 24 0.34 24 - 32 0.38 34 - 42 0.43 45 - so 0.42 59 - 69 0.44 74 - 78 0.43 86 - 95 0.42 2 - 6 0.43 19 - 27 0.40 30 - 40 0.39 43 - 57 0.40 61 - 77 0.44 6 - 13 0.37 17 - 30 0.41 31 - 45 0.42 45 - 59 0.45 59 - 69 0.46 75 - 86 0.41 1 - 6 0.43 14 - 28 0.39 31 - 45 0.42 57 - 79 0.41 79 - 86 0.46 Station Level Density (cm) (g/ cm3) Station Level Density (cm) (Q./ cm8 ) S70 2 - 7 0.36 S90 60 - 69.6 0.46 10 - 19 0.42 70 - 79,3 0.38 25 - 38 0.43 84 - 98.5 0.43 42 - 52 0.39 99 - 109 .6 0.43 56 - 80 0.42 S95 1 - 6 0.43 95 - 105 0.43 10 - 21 0.44 106 - 120 0.46 25 - 37 0.37 120 - 134 0.47 44 - 53 0.43 136 - 150 0.44 54 - 69 0.42 150 - 169 0.44 74 - 83 0.50 170 - 187 0.48 88 - 99 0.42 S75 1 - 7.7 0.38 S110 2 - 10.8 0.39 23 - 36.0 0.38 22 - 36.2 0.44 36 - 41.0 0.40 43 - 58.5 0.40 41 - 51. 7 0.36 63 - 75.1 0.42 59 - 74.7 0.45 84 -101.9 0.47 75 - 90.3 0.42 92 - 102.9 0.42 Sl20 6 - 19. 7 0.42 23 - 38.5 0.46 S80 0 - 4 0.37 42 - 54.0 0.40 10 - 13 0.36 55 64.5 0.44 17 - 20 0.35 68 - 75.4 0.37 28 - 31 0.41 78 - 86.7 0.46 40 - 43 0.40 46 - so 0.43 S130 6 - 16.2 0.40 60 - 64 0.42 20 - 26.0 0.44 80 - 84 0.44 28 - 44.7 0.52 90 - 93 0.38 49 - 68.2 0.47 77 - 87.6 0.51 S85 3 - 12.8 0.46 92 - 105.2 0.44 15 - 22.5 0.41 106 - 110.5 0.45 27 - 40.0 0.38 40 - 53.9 0.38 S140 8 - 17.5 0.41 58 - 73.2 0.42 20 - 31.3 0.42 74 - 87.0 0.45 36 - 47.8 0.42 - 53 - 65.7 0.42 S90 1 - 8.0 0.22 68 - 78.0 0.47 16 - 26.2 0.40 80 - 98.2 0.39 38 - 52.2 0.45 - 182-Station 5160 5186 Level (cm) 1 - 14.5 18 - 22.8 26 - 34.2 38 - 49.1 51 - 62.0 62 - 73.7 75 - 85.9 94 - 100.1 101 - 113.0 113 - 123. 7 126 - 140.0 140 - 156.2 164 - 176.7 181 - 194 ,9 196 - 209.6 210 - 224.2 227 - 241.0 241 - 251.1 252 - 263. 7 264 - 278.2 279 - 290.2 310 - 313,9 314 - 325 .4 326 - 342 .3 343 - 361.8 366 - 380. 7 381 - 392 .8 393 - 404.1 414 - 430.6 432 - 442 .4 443 - 456. 7 457 - 470 .1 482 - 499.6 12 - 14.2 40 - 42.2 60 - 62.2 Density (Q./ cm3) Stati on 0.46 5233 0.43 0.44 0.39 0.42 0 ,41 5240 0.45 0.37 0.36 0.39 0.40 0.41 0.54 A075 0.47 0.40 0.46 0.46 0.45 0.45 0.43 0.51 0.44 0.45 0.45 0.48 0.46 0.46 0.44 0 .43 0.48 0.47 0.48 0.46 0.45 0.41 0.44 - 183-Leve] Density (cm) (Q./ cm3) 1 - 10.2 0.42 16 - 30.2 0.50 39 - 52.7 0.41 56 - 72.1 0.44 82 - 102.8 0.44 10 - 12.2 0.45 20 - 22.2 0.44 35 - 37.2 0.45 45 - 47.2 0.46 55 - 57.2 0.35 70 - 72.2 0.48 2 - 10 0.44 38 - 47 0.47 so - 57 0.42 62 - 75 0.43 90 - 114 0.47 123 - 130 0.49 132 - 142 0.46 148 - 157 0.40 158 - 168 0.44 172 - 186 0.43 194 - 200 0.45 200 - 204 0.44 205 - 215 0.45 217 - 227 0.46 230 - 240 0.55 240 - 250 0.56 256 - 267 0.44 281 - 292 0.49 293 - 305 0.48 311 - 320 0.62 322 - 334 0.47 337 - 345 0.46 351 - 360 o·.46 361 - 369 0.45 370 - 380 0.51 Station Level Uensit) <cm) (g/ cm3 Station Level D/csit) (cm) (� cm• A075 380 - 397 0.49 A075 871 - 880 0.53 403 - 412 0.50 880 - 893 0.54 414 - 424 0.50 897 - 913 0.52 424 - 436 0.54 918 - 927 0.52 440 - 450 0.49 930 - 935 0.52 451 - 461 0.46 938 - 942.5 0.54 466 - 474.5 0.53 945 - 954 0.53 480 - 490 0.51 956 - 968 0.52 490 - 500 0.50 970 - 983.: 0.53 501 - 507 0.47 984 -1000 0.55 511 - 520 0.50 C60 15 - 21 0.45 524 - 533 0.50 35 - 42.5 0.52 535 - 549 0.49 50 - 59 0.47 558 - 561 0.46 65 - 82 0.43 562 - 572 0.50 C80 0 - 4 0.32 575 - 583 0.50 20 - 23 0.48 588 - 600 0.49 31 - 34 0.42 600 - 613 0.50 (Snow 36 - 39,5 0.42 617 - 626.S 0.50 pit) 50 - 53.5 0.42 633 - 657 0.55 60 - 64 0.45 663 - 675 0.53 66 - 70 0.45 675 - 685 0.52 80 - 84 0.52 687 - 700 0.53 C80* 80 - 97 0.49 700 - 705 0.50 241 - 253 0.45 710 - 720 0.51 310 - 327 0.51 722 - 732 0.51 382 - 399 0.51 735 - 745 0.51 430 - 449 0.52 746 - 754 0.52 465 - 475 0.58 766 - 777 0.48 (Snow 580 - 595 0.54 core) 778 - 789.5 0.47 700 - 719 0.55 791 - 800 0.50 805 - 819 0.57 802 - 815 0.56 840 - 854 0.52 815 - 826 0.54 910 - 927 0.57 830 - 842 0.55 975 - 990 0.59 843 - 852 0.54 857 - 868 0.54 -184-Table 2. Kinosita' s hardness of the surface snow cover in Mizuho Plateau in 1969 - 1970. Level Kinosita's Station (cm) hardness (kg/ cm2 ) Level Kinosita's Station (cm) hardness (k.12./ cm� ) S- 75 23 10 A075 192 18 37 10 205 20 17 216 16 59 15 228 140 75 8.6 240 140 30 292 37 92 8.0 310 75 26 323 58 S-80 10 4.3 336 18 17 4,3 350 so 28 12 360 38 14 370 58 40 3.8 380 45 4.6 390 so 47 8.0 403 35 9,0 414 20 60 14 423 67 70 50 440 44 80 12 450 29 90 6.6 466 85 100 12 480 48 S-186 0 42 490 so 20 33 500 48 40 14 511 48 60 13 523 48 A 075 37 29 535 65 so 15 557 14 61 15 561 35 90 17 574 67 102 18 588 so 122 38 601 so 130 19 617 47 157 9.5 632 140 171 7.7 646 90 -185-Level Kinosita's Level Kinosita's Station hardness Station hardness (cm) (k'1./ cm�) (cm) (kg/ crrr ) A 075 662 140 C-55 25 26 675 90 60 30 687 77 80 20 700 50 C-60 35 30 710 77 50 26 721 77 65 7.2 734 100 C-65 5 15 746 77 20 5.0 765 34 40 20 777 35 65 2.2 790 31 C-75 0 6.2 802 130 50 815 130 35 9.0 830 100 50 1.3 842 100 60 50 857 130 70 14 870 130 C-80 10 2.5 880 160 20 60 897 67 31 29 917 50 36 29 930 57 50 25 939 100 60 77 946 46 67 67 956 50 81 77 969 100 102 100 985 100 116 7.8 C-45 0 30 C-85 0 4.6 60 3.0 8.7 C-50 0 20 17 6.0 3 11 15 11 70 5.6 70 2.0 C-111 10 so· C-55 0 1.9 65 15 4.8 10 17 -1 86-

XI. DENSITY AND HARDNESS OF SNOW IN MIZUHO PLATEAU IN 1969-1970

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XI. DENSITY AND HARDNESS OF SNOW IN MIZUHO PLATEAU IN 1969-1970

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