Oxygen isotopes -- snowpits; GISP2 Site 57 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. For the data below the sample size was 10 cm for the upper 2 m (pit wall), and 5 cm below that (core). All depths are in cm. 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 57: N 71 55 14, W 35 57 33, 3090 m DATA: Depth Top Cal. Year Density del18O Ice depth (cm) Top kg/m^3 (per mil) (cm) 0 1987.78 279.07 -33.85 0 10 1987.85 320.38 -37.49 3.04 20 1987.82 349.76 -33.83 6.53 30 1987.68 391.07 -37.39 10.34 40 1987.43 369.04 -36.39 14.6 50 1987.14 339.66 -38.24 18.62 60 1986.86 320.38 -35 22.32 70 1986.61 300.19 -30.42 25.81 80 1986.4 304.78 -32.52 29.08 90 1986.23 341.5 -36.84 32.4 100 1986.07 383.72 -38.85 36.12 110 1985.93 457.16 -38.04 40.3 120 1985.77 369.04 -36.3 45.28 130 1985.59 291.01 -27.73 49.3 140 1985.4 353.43 -30.91 52.47 150 1985.13 373.63 -36.52 56.32 160 1984.89 351.59 -36.15 60.39 170 1984.75 359.86 -31.81 64.22 180 1984.65 391.07 -32.64 68.14 190 1984.55 335.07 -31.2 72.4 200 1984.19 337.82 -36.81 82.56 205 1984.12 339.66 -39.7 84.4 210 1984.04 376.38 -40.5 86.25 215 1983.96 403.92 -40.04 88.3 220 1983.87 385.56 -39.57 90.5 225 1983.8 372.71 -39.02 92.6 230 1983.73 370.87 -37.25 94.63 235 1983.66 359.86 -34.11 96.65 240 1983.59 343.33 -32.52 98.61 245 1983.53 345.17 -34.05 100.48 250 1983.47 385.56 -32.24 102.36 255 1983.4 403.92 -32.85 104.46 260 1983.33 402.08 -34.64 106.66 265 1983.25 402.08 -37.18 108.85 270 1983.16 403.92 -39.23 111.04 275 1983.06 402.08 -40.02 113.24 280 1982.94 405.76 -35.15 115.43 285 1982.79 405.76 -32.95 117.64 290 1982.61 405.76 -32.1 119.85 295 1982.38 407.59 -34.94 122.06 300 1982.12 414.94 -40.96 124.28 305 1981.9 413.1 -38.59 126.54 310 1981.76 398.41 -36.25 128.79 315 1981.67 374.54 -37.28 130.96 320 1981.62 376.38 -35.16 133 325 1981.58 374.54 -32.7 135.05 330 1981.53 405.76 -30.52 137.09 335 1981.46 403.92 -31.3 139.3 340 1981.36 405.76 -33.39 141.5 345 1981.25 405.75 -35.93 143.71 350 1981.14 403.92 -38.24 145.92 355 1981.04 405.76 -38.6 148.12 360 1980.96 405.59 -37.4 150.33 365.5 1980.91 405.59 -35.93 152.76 371 1980.67 400.25 -32.26 166.19 376 1980.57 400.25 -30.24 168.37 381 1980.42 402.08 -31.52 170.55 386 1980.25 409.43 -37.25 172.74 391 1980.08 407.59 -37.96 174.97 396 1979.93 409.43 -37.25 177.19 401 1979.83 407.59 -36.69 179.42 406 1979.75 407.59 -35.14 181.64 411 1979.68 409.43 -34.23 183.86 416 1979.61 407.59 -34.45 186.09 421 1979.5 409.43 -33.96 188.31 426 1979.36 407.59 -33.73 190.54 431 1979.21 427.79 -38.16 192.76 436 1979.06 427.79 -38.86 195.09 441 1978.96 427.79 -38.45 197.42 446 1978.9 427.79 -36.81 199.75 451 1978.86 433.3 -36.44 202.08 456 1978.82 435.13 -35.79 204.44 461 1978.73 407.59 -33.72 206.81 466 1978.59 385.56 -33.25 209.03 471 1978.39 400.25 -34.71 211.13 476 1978.12 398.41 -36.02 213.31 481 1977.89 400.25 -35.37 215.48 486 1977.74 475.52 -32.73 217.66 491 1977.62 528.77 -30.11 220.25 496 1977.55 528.77 -29.52 223.13 501 1977.5 528.77 -29.56 226.01 506 1977.45 528.77 -29.98 228.89 511 1977.39 528.77 -30.48 231.77 516 1977.2 411.27 -31.77 238.61 521 1977.12 409.43 -34.21 240.85 526 1977.04 403.92 -36.13 243.08 531 1976.96 420.45 -35.22 245.28 536 1976.87 447.98 -32.7 247.57 541 1976.76 446.15 -31.29 250.01 546 1976.66 447.98 -28.84 252.44 551 1976.55 446.15 -28.42 254.88 556 1976.45 442.48 -29.18 257.31 561 1976.34 442.48 -31.71 259.72 566 1976.24 442.48 -34.7 262.13 571 1976.14 442.48 -37.07 264.54 576 1976.05 444.31 -37.76 266.95 581 1975.96 440.64 -37.59 269.37 585.5 1975.88 442.68 -37.12 271.53 590 1975.73 440.64 -36.34 275.94 595 1975.65 449.82 -33.72 278.34 600 1975.58 460.83 -31.09 280.79 605 1975.5 462.68 -30.79 283.3 610 1975.42 460.83 -32.59 285.82 615 1975.34 459 -34.19 288.33 620 1975.26 447.98 -36.01 290.83 625 1975.17 446.15 -37.63 293.27 630 1975.06 447.98 -38.51 295.7 635 1974.94 447.98 -36.63 298.14 640 1974.8 446.15 -34.18 300.58 645 1974.65 457.16 -32.22 303.01 650 1974.5 460.84 -32.17 305.5 655 1974.35 460.83 -33.98 308.01 660 1974.2 473.69 -36.67 310.52 665 1974.07 471.85 -37.68 313.1 670 1973.94 471.85 -37.08 315.67 675 1973.82 473.69 -34.91 318.24 680 1973.7 471.85 -33.11 320.82 685 1973.57 473.69 -32.33 323.39 690 1973.42 481.44 -33.82 325.97 694.5 1973.28 482.87 -33.61 328.33 699.5 1972.9 451.65 -33.89 334.97 704.5 1972.79 451.66 -33.07 337.43 709.5 1972.7 451.65 -31.89 339.89 714.5 1972.63 451.65 -30.95 342.35 719.5 1972.57 471.85 -30.34 344.81 724.5 1972.52 488.38 -29.36 347.38 729.5 1972.48 488.38 -30.52 350.04 734.5 1972.45 488.37 -32.07 352.7 739.5 1972.42 488.38 -33.73 355.36 744.5 1972.39 488.38 -34.15 358.02 749.5 1972.35 539.78 -34.25 360.68 754.5 1972.31 741.75 -35.34 363.62 759.5 1972.22 741.75 -36.14 367.66 764.5 1972.09 743.58 -36.38 371.7 769.5 1971.9 574.67 -33.84 375.75 774.5 1971.73 462.67 -30.7 378.88 779.5 1971.58 466.35 -29.32 381.4 784.5 1971.42 473.69 -31.59 383.94 789.5 1971.28 473.69 -33.45 386.52 794.5 1971.14 497.55 -35.09 389.1 799.5 1971 497.55 -35.14 391.81 804.5 1970.88 497.56 -33.82 394.52 809.5 1970.76 497.55 -32.1 397.23 814.5 1970.66 497.76 -30.7 399.94 819 1970.56 473.69 -29.89 402.38 824 1970.44 473.69 -30.89 404.96 829 1970.32 475.52 -33.55 407.54 834 1970.2 473.69 -36.14 410.13 839 1970.07 473.69 -36.91 412.71 844 1969.93 475.52 -36.47 415.29 849 1969.8 473.69 -34.92 417.88 854 1969.68 482.87 -32.19 420.46 859 1969.56 490.21 -30.56 423.09 864 1969.44 490.21 -31.3 425.76 869 1969.34 488.38 -33.87 428.43 874 1969.24 489.6 -36.13 431.09 878.5 1969.15 489.6 -36.44 433.49 883 1968.95 493.88 -36.62 438.11 888 1968.83 495.72 -35.91 440.8 893 1968.7 493.88 -34 443.5 898 1968.56 493.88 -33.14 446.19 903 1968.44 493.88 -33.71 448.88 908 1968.31 493.88 -35.52 451.57 913 1968.19 495.72 -37.32 454.26 917.5 1968.07 495.72 -38.26 456.69 922.5 1967.92 497.55 -37.32 459.39 927.5 1967.76 495.72 -36.07 462.1 932.5 1967.59 497.56 -35.85 464.8 937.5 1967.41 495.72 -36.13 467.51 942.5 1967.23 504.9 -38.07 470.21 947.5 1967.07 510.41 -40.45 472.96 952.5 1966.94 510.41 -40.04 475.74 957.5 1966.84 488.38 -39.06 478.52 962.5 1966.78 468.18 -37.6 481.18 967.5 1966.73 468.18 -38.66 483.73 972.5 1966.69 468.18 -37.76 486.28 977.5 1966.65 462.68 -36.35 488.83 982.5 1966.6 454.92 -35.43 491.35 987 1966.54 506.74 -34.2 493.58 992 1966.45 508.57 -34.56 496.34 997 1966.33 506.74 -35.05 499.11 1002 1966.19 507.96 -35.21 501.87 1006.5 1966.06 507.96 -35.49 504.36 1011 1965.83 508.57 -34.7 509.07 1016 1965.71 510.41 -33.53 511.84 1021 1965.6 508.58 -32.63 514.62 1026 1965.5 510.4 -32.6 517.39 1031 1965.42 508.58 -32.85 520.17 1036 1965.34 510.4 -33.94 522.94 1041 1965.27 508.58 -34.33 525.72 1046 1965.18 510.41 -35.27 528.49 1051 1965.07 508.56 -35.73 531.27 1056 1964.93 510.41 -35.42 534.04 1061 1964.76 508.58 -34.64 536.82 1066 1964.58 510.4 -34.51 539.59 1071 1964.42 508.58 -34.6 542.37 1076 1964.27 510.4 -35.47 545.14 1081 1964.13 508.58 -35.81 547.92 1086 1964 510.4 -35.85 550.69 1091 1963.87 508.58 -35.35 553.47 1096 1963.73 510.41 -34.68 556.24 1101 1963.58 508.56 -33.77 559.02