Oxygen isotopes -- snowpits; GISP2 Site 51 REFERENCES: Bolzan, J.F., and M. Strobel. 1994. Accumulation-rate variations around Summit, Greenland. Journal of Glaciology 40:56-66. DATA DESCRIPTION: These files contain oxygen-isotope profiles for 9 shallow cores (to approximately 17 m depth) recovered over a 150 x 150 km survey grid in central Greenland. All cores were recovered in May, 1987. Isotopic data in the upper 2 m of each profile were from the shallow drilling pits. Details on the site location, the core recovery, and the assignment of core loss are given in Bolzan and Strobel, (1994). For the data below, all depths are in cm. Dating of samples was based on the seasonal variation in the oxygen isotope stratigraphy, along with measurements of gross beta activity (see Bolzan and Strobel, 1994). Time is in decimal years, where 87 = 1987, etc. The first 2 columns refer to the true depth and age at the top of the sample, where the age is based on a spline interpolation of the dating described in Bolzan and Strobel (1994). The time is in decimal calendar years. Column 3 is density in kg/m3. Column 4 are the O18 values in per mil. Column 5 is the ice-equivalent depths at the top of the sample. SITE 51: N 71 55 36, W 39 50 07, 3112 m DATA: Depth Top Cal. Year Density del18O Ice depth (cm) Top kg/m^3 (per mil) (cm) 0 1987.42 387.4 -33.28 0 10 1987.36 326.81 -28.88 4.22 20 1987.28 358.02 -35.55 7.78 30 1987.21 368.12 -38.9 11.68 40 1987.13 391.07 -37.11 15.69 50 1986.87 380.05 -42.07 19.95 60 1986.68 294.68 -29.37 24.09 70 1986.51 313.04 -33.19 27.3 80 1986.35 354.35 -30.62 30.71 90 1986.25 320.38 -29.29 34.57 100 1986.16 351.59 -32.09 38.06 110 1986.06 405.76 -38.34 41.89 120 1985.94 418.61 -39.63 46.31 130 1985.79 421.36 -37.12 50.87 140 1985.66 349.76 -32.3 55.46 150 1985.55 323.14 -26.35 59.27 160 1985.45 333.23 -26.87 62.79 170 1985.35 403.92 -25.52 66.42 180 1985.26 372.71 -34.12 70.82 190 1985.16 384.64 -34.87 74.88 200 1985.09 391.07 -35.58 79.8 205 1985.03 392.9 -38.91 81.93 210 1984.97 391.07 -39.65 84.07 215 1984.89 391.07 -38.54 86.2 220 1984.81 391.07 -37.45 88.33 225 1984.73 392.9 -33.98 90.46 230 1984.64 391.07 -29.63 92.6 235 1984.55 391.07 -27.5 94.73 240 1984.45 391.07 -26.63 96.86 245 1984.36 385.56 -27.19 98.99 250 1984.27 376.38 -28.03 101.09 255 1984.19 376.38 -29.48 103.14 260 1984.11 376.38 -32.14 105.19 265 1984.03 376.38 -34.38 107.24 270 1983.97 376.38 -36.93 109.29 275 1983.91 376.38 -39.41 111.34 280 1983.86 376.38 -37.47 113.39 285 1983.82 399.84 -35.07 115.44 289.5 1983.78 397.8 -35.31 117.4 294 1983.73 400.25 -37.19 119.35 299 1983.67 398.41 -35.43 121.53 304 1983.6 398.41 -32.23 123.7 309 1983.54 393.72 -32.94 125.87 313.5 1983.46 377.4 -33.55 127.8 318 1983.37 378.22 -31.24 129.65 323 1983.26 378.22 -30.32 131.71 328 1983.15 396.57 -33.25 133.77 333 1983.05 396.58 -37.54 135.93 338 1982.95 396.58 -39.93 138.09 343 1982.87 396.58 -39.56 140.25 348 1982.8 394.74 -36.61 142.41 353 1982.73 396.58 -34.44 144.56 358 1982.66 396.58 -34.06 146.72 363 1982.6 396.57 -33.32 148.88 368 1982.53 396.58 -31.68 151.04 373 1982.46 396.58 -31.41 153.2 378 1982.39 394.74 -31.44 155.36 383 1982.25 437.3 -35.83 158.62 388.5 1982.15 435.13 -37.98 161.24 393.5 1982.06 436.97 -40.72 163.61 398.5 1981.94 435.63 -42.29 165.99 404 1981.85 418.61 -37.67 168.6 409 1981.75 416.77 -33.07 170.88 414 1981.64 418.94 -31.15 173.15 419.5 1981.55 416.77 -29.72 175.66 424.5 1981.45 418.94 -28.43 177.93 430 1981.36 424.12 -30.47 180.44 435 1981.28 422.28 -32.69 182.75 440 1981.2 422.28 -35.37 185.05 445 1981.12 424.12 -37.54 187.35 450 1981.04 422.28 -39.05 189.66 455.5 1980.96 424.12 -40.61 192.19 460.5 1980.89 422.28 -39.82 194.5 466 1980.82 422.28 -36.85 197.03 471 1980.74 438.8 -34.5 199.8 476 1980.67 438.8 -33.05 202.19 481 1980.6 438.8 -30.98 204.58 486 1980.53 438.8 -28.69 206.97 491 1980.47 438.6 -27.86 209.36 495.5 1980.4 436.56 -30.6 211.51 500 1980.33 435.13 -33.65 213.65 505 1980.24 436.97 -35.78 216.02 510 1980.15 436.97 -37.01 218.4 515 1980.05 435.13 -38.24 220.78 520 1979.94 436.97 -38.54 223.15 525 1979.82 435.13 -38.05 225.53 530 1979.7 436.97 -35.85 227.9 535 1979.6 436.56 -33.37 230.28 539.5 1979.5 411.27 -31.92 232.42 544.5 1979.42 411.26 -32.07 234.66 549.5 1979.35 411.27 -33.15 236.9 554.5 1979.3 411.27 -33.45 239.14 559.5 1979.25 411.26 -34.44 241.38 564.5 1979.19 452.88 -33.32 243.62 569 1979.13 451.66 -33.26 245.84 574 1979.05 453.49 -35.22 248.3 579 1978.95 453.49 -36.08 250.77 584 1978.83 451.65 -35.27 253.24 589 1978.7 453.5 -32.53 255.7 594 1978.56 462.34 -29.66 258.17 599.5 1978.44 460.67 -28.19 260.94 605 1978.35 462.67 -28.89 263.7 610 1978.27 462.67 -30.44 266.22 615 1978.2 460.84 -31.43 268.74 620 1978.14 462.67 -32.82 271.25 625 1978.08 469.2 -36.05 273.77 629.5 1978.03 470.02 -37.45 276.07 634.5 1977.97 468.18 -38.15 278.63 639.5 1977.91 470.02 -37.6 281.18 644.5 1977.85 468.18 -36.52 283.74 649.5 1977.78 470.02 -35.06 286.29 654.5 1977.72 470.02 -31.53 288.85 659.5 1977.65 468.18 -28.3 291.41 664.5 1977.59 446.15 -27.42 293.96 669.5 1977.53 447.98 -27.29 296.39 674.5 1977.47 446.15 -26.48 298.83 679.5 1977.41 468.18 -27.13 301.26 684.5 1977.35 477.36 -27.38 303.81 689.5 1977.28 477.36 -28.91 306.41 694.5 1977.21 479.19 -30.81 309.01 699.5 1977.14 477.36 -33.19 311.62 704.5 1977.05 477.36 -34.91 314.22 709.5 1976.95 477.36 -36.81 316.82 714.5 1976.84 477.36 -36.17 319.42 719.5 1976.72 477.36 -34.08 322.02 724.5 1976.62 483.48 -30.6 324.62 729 1976.5 486.54 -28.81 326.99 734 1976.39 488.37 -29.1 329.64 739 1976.29 486.54 -30.06 332.3 744 1976.2 486.54 -30.72 334.95 749 1976.12 468.18 -33.37 337.6 754 1976.04 468.18 -38.5 340.15 759 1975.96 470.02 -39.51 342.7 764 1975.89 470.02 -37.89 345.26 769 1975.82 481.03 -36.62 347.82 774 1975.76 479.19 -34.87 350.44 779 1975.7 479.2 -32.53 353.05 784 1975.64 471.85 -30.92 355.66 789 1975.58 470.02 -29.22 358.23 794 1975.53 468.18 -27.19 360.79 799 1975.47 470.02 -26.43 363.34 804 1975.42 468.18 -27.09 365.9 809 1975.37 471.85 -29.1 368.45 814 1975.3 481.04 -32.95 371.02 819 1975.23 481.03 -35.57 373.64 824 1975.15 481.03 -37.53 376.26 829 1975.05 481.03 -38.89 378.88 834 1974.94 481.03 -39.55 381.5 839 1974.81 479.2 -36.63 384.12 844 1974.68 481.03 -32.89 386.73 849 1974.56 481.03 -30.08 389.35 854 1974.45 481.03 -28.83 391.97 859 1974.35 481.03 -29.75 394.59 864 1974.26 475.52 -30.72 397.21 869 1974.16 471.85 -32.72 399.8 874 1974.06 468.18 -34.21 402.37 879 1973.94 466.34 -34.39 404.92 884 1973.79 477.36 -33.88 407.46 889 1973.64 486.54 -32.7 410.06 894 1973.5 488.38 -31.41 412.71 899 1973.38 488.38 -31.44 415.37 904 1973.28 493.88 -33.24 418.03 909 1973.19 510.41 -35.76 420.72 914 1973.12 510.41 -38.4 423.5 919 1973.04 512.25 -39.93 426.28 924 1972.96 510.41 -41.9 429.07 929 1972.87 510.41 -41.26 431.85 934 1972.78 512.25 -38.51 434.63 939 1972.7 510.41 -36.73 437.42 944 1972.61 510.41 -34.87 440.2 949 1972.53 512.24 -34.36 442.98 954 1972.47 510.41 -33.76 445.77 959 1972.41 497.56 -33.89 448.55 964 1972.37 482.87 -33 451.26 969 1972.32 484.7 -35.03 453.89 974 1972.27 512.04 -36.46 456.53 978.5 1972.21 514.08 -37.09 459.04 983.5 1972.14 514.08 -37.66 461.84 988.5 1972.05 514.08 -38.79 464.64 993.5 1971.94 514.08 -40.38 467.44 998.5 1971.81 514.08 -39.06 470.24 1003.5 1971.68 497.55 -33.95 473.04 1008.5 1971.56 497.55 -31.29 475.75 1013.5 1971.45 497.56 -30 478.46 1018.5 1971.35 497.55 -31.62 481.17 1023.5 1971.26 495.72 -33.5 483.88 1028.5 1971.17 497.56 -34.84 486.58 1033.5 1971.06 497.55 -35.11 489.29 1038.5 1970.93 497.55 -35.33 492 1043.5 1970.78 497.56 -34.35 494.71 1048.5 1970.63 495.72 -32.83 497.42 1053.5 1970.5 497.55 -31.3 500.12 1058.5 1970.4 495.72 -31.23 502.83 1064 1970.33 495.72 -33 505.8 1069 1970.28 493.88 -35.69 508.5 1074 1970.24 495.72 -37.04 511.19 1079 1970.19 495.72 -37.67 513.89 1084 1970.13 493.88 -37.17 516.59 1089 1970.05 506.73 -37.79 519.28 1094 1969.94 506.74 -38.28 522.04 1099 1969.8 506.74 -38.06 524.8 1104 1969.64 504.9 -35.78 527.56 1109 1969.5 501.22 -32.98 530.31 1114 1969.38 499.4 -32.92 533.04 1119 1969.28 499.39 -33.66 535.76 1124 1969.19 499.4 -33.71 538.48 1129 1969.11 475.69 -34.03 541.2 1134.5 1969.04 457.16 -34.05 544.05 1139.5 1968.96 455.34 -34.15 546.54 1144.5 1968.88 520.2 -34.07 549.02 1149 1968.78 519.59 -33.84 551.57 1154 1968.68 521.42 -32.51 554.4 1159 1968.59 521.43 -30.55 557.24 1164 1968.5 523.26 -29.81 560.08 1169 1968.42 521.43 -29.73 562.93 1174 1968.35 523.26 -31.07 565.77 1179 1968.28 523.26 -32.97 568.62 1184 1968.2 523.27 -34.74 571.47 1189 1968.13 519.59 -35.32 574.32 1194 1968.05 515.92 -36.01 577.15 1199 1967.95 517.75 -36.65 579.96 1204 1967.85 515.92 -35.4 582.78 1209 1967.74 515.92 -33.32 585.59 1214 1967.62 515.92 -31.77 588.4 1219 1967.5 519.08 -31.2 591.21 1224.5 1967.39 519.59 -31.15 594.32 1229.5 1967.28 519.58 -32.32 597.15 1234.5 1967.17 519.59 -34.07 599.98 1239.5 1967.06 519.59 -34.85 602.81 1244.5 1966.94 539.11 -35.53 605.64 1250 1966.81 539.78 -35.05 608.87 1255 1966.69 537.95 -34.56 611.81 1260 1966.56 530.61 -32.72 614.74 1265 1966.44 528.77 -31.39 617.63 1270 1966.31 530.61 -32.19 620.51 1275 1966.18 530.6 -34.03 623.4 1280 1966.06 530.61 -36.21 626.29 1285 1965.94 528.77 -36.6 629.18 1290 1965.83 530.61 -36.34 632.06 1295 1965.73 530.61 -35.11 634.95 1300 1965.63 530.6 -32.69 637.84 1305 1965.54 528.77 -30.48 640.73 1310 1965.46 543.46 -29.65 643.61 1315 1965.38 548.96 -29.99 646.57 1320 1965.31 548.96 -31.24 649.56 1325 1965.24 548.96 -32.64 652.55 1330 1965.17 547.14 -34.26 655.54 1335 1965.1 548.96 -35.12 658.52 1340 1965.04 548.96 -36.49 661.51 1345 1964.96 548.96 -36.69 664.5 1350 1964.89 548.96 -36.22 667.49 1355 1964.81 548.96 -35.01 670.48 1360 1964.72 543.46 -33.19 673.47 1365 1964.64 541.62 -31.46 676.43 1370 1964.55 543.46 -29.86 679.38 1375 1964.45 543.45 -29.26 682.34 1380 1964.36 543.46 -29.63 685.3 1385 1964.27 530.61 -31.07 688.26 1390 1964.18 525.09 -33.24 691.15 1395 1964.09 525.09 -34.74 694.01 1400 1964 525.09 -35.24 696.87 1405 1963.91 561.82 -35.2 699.73 1410 1963.82 569.17 -34.84 702.79 1415 1963.73 570.99 -33.77 705.89 1420 1963.64 569.16 -31.76 709 1425 1963.55 571 -29.97 712.1 1430 1963.45 569.16 -28.7 715.21 1435 1963.35 550.8 -30.14 718.31 1440 1963.25 547.12 -32.87 721.31 1445 1963.15 545.3 -35.48 724.29 1450 1963.05 545.29 -35.83 727.26 1455 1962.95 556.31 -35.66 730.23 1460 1962.86 556.3 -36.05 733.26 1465 1962.76 554.48 -35.88 736.29 1470 1962.66 556.31 -34.81 739.31 1475 1962.56 556.3 -33.16 742.34 1480 1962.44 554.48 -32.05 745.37 1485 1962.32 556.3 -32.77 748.39 1490 1962.19 554.48 -34.99 751.42 1495 1962.06 556.3 -37.16 754.44 1500 1961.94 554.48 -39.35 757.47 1505 1961.83 556.31 -38.8 760.49 1510 1961.73 554.46 -37.22 763.52 1515 1961.63 554.48 -33.88 766.54 1520 1961.54 556.31 -30.44 769.56 1525 1961.46 554.46 -28.88 772.59 1530 1961.37 554.48 -29.44 775.61 1535 1961.28 552.64 -31.08 778.63 1540 1961.2 552.64 -33.17 781.64 1545 1961.1 552.63 -35.73 784.65 1550 1961 554.48 -36.89 787.66 1555 1960.89 554.48 -36.7 790.68 1560 1960.78 556.3 -35.31 793.7 1565 1960.66 556.31 -34.19 796.73 1570 1960.55 561.82 -32.82 799.76 1575 1960.45 561.82 -31.18 802.82 1580 1960.36 563.65 -31.72 805.88 1585 1960.28 563.65 -32.53 808.95 1590 1960.2 563.65 -33.76 812.02 1595 1960.12 563.64 -35.39 815.09 1600 1960.04 563.65 -37.01 818.16 1605 1959.96 561.82 -37.43 821.23 1610 1959.86 563.65 -36.69 824.29 1615 1959.76 563.65 -35.42 827.36 1620 1959.66 512.41 -33.55 830.43 1625.5 1959.55 563.65 -31.8 833.5 1630.5 1959.45 563.65 -31.05 836.57 1635.5 1959.34 561.82 -31.36 839.64 1640.5 1959.24 563.65 -32.75 842.7 1645.5 1959.14 563.65 -34.7 845.77 1650.5 1959.04 626.27 -35.87 848.84