10Be concentration (103 atom/g) in GISP2 ice, 719 - 2253 m REFERENCES: Finkel, R.C., and K. Nishiizumi. 1997. Beryllium 10 concentrations in the Greenland Ice Sheet Project 2 ice core from 3-40 ka. Journal of Geophysical Research 102:26699-26706. Alley, R.B., R.C. Finkel, K. Nishiizumi, S. Anandakrishnan, C.A. Shuman, G.R. Mershon, G.A. Zielinski, and P.A. Mayewski. 1995. Changes in continental and sea-salt atmospheric loadings in central Greenland during the most recent deglaciation: Model-based estimates. Journal of Glaciology 41:503-514. Davis, J.C., I.D. Proctor, J.R. Southon, M.W. Caffee, D.W. Heikkinen, M.L. Roberts, T.L. Moore, K.W. Turteltaub, D.E. Nelson, D.H. Loyd, and J.S. Vogel. 1990. LLNL/UC AMS facility and research program. Nuclear Instruments and Methods in Physics Research B52:269-272. DATA DESCRIPTION: Melted water was collected from the outside of samples taken for cation and anion analysis by the UNH group. A small aliquot was taken for anion analysis (chloride, nitrate, and sulfate) and the remainder was weakly acidified with HNO3 to yield a final pH of about 2. Be, Cl and Al carriers were then added. The Be (and Al and Cl) were concentrated from the melted ice using ion exchange resins. Be was then eluted from the cation exchange column, precipitated as Be(OH)2 and ignited to BeO for accelerator mass spectrometry (AMS) measurement. The AMS measurements were carried out at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry (Davis et al., 1990). The 10Be (half-life = 1.5 x 10^6 years) concentration was normalized to an ICN standard (diluted by K. Nishiizumi) after carrier blank and boron background correction. Depth intervals are continuous. Missing data are denoted by '999999'. DATA: depth top (m) depth bottom (m) 10Be (10^3 atom/g) +/- age top (yr) age bottom (yr) (m) (m) (10^3 atom/g) (yr BP) (yr BP) 719.00 722.52 16.27 0.46 3288 3308 722.52 725.87 13.43 0.46 3308 3329 725.87 729.19 16.26 0.39 3329 3348 729.19 734.20 16.40 0.41 3348 3378 734.20 737.93 20.34 0.51 3378 3399 737.93 741.65 20.21 0.72 3399 3422 746.51 750.70 17.46 0.44 3451 3477 750.70 756.01 17.24 0.38 3477 3508 756.01 759.27 15.65 0.50 3508 3527 759.27 762.53 17.36 0.45 3527 3547 762.53 766.17 15.04 0.94 3547 3569 766.17 772.22 15.19 0.63 3569 3603 772.22 777.80 16.60 0.95 3603 3638 777.80 780.24 13.00 0.94 3638 3653 780.24 785.43 13.83 0.68 3653 3684 785.43 789.40 16.17 0.40 3684 3707 789.40 793.90 14.48 0.57 3707 3734 793.90 798.09 14.84 0.65 3734 3759 798.09 803.59 15.21 0.58 3759 3791 803.59 807.89 13.48 0.75 3791 3817 808.92 812.18 12.64 0.64 3824 3844 812.18 817.61 16.19 0.64 3844 3877 817.61 821.09 13.85 0.61 3877 3899 821.09 825.33 13.02 0.61 3899 3925 825.33 828.70 16.01 0.66 3925 3946 828.70 834.89 16.55 0.62 3946 3985 834.83 839.08 16.89 0.69 3985 4011 839.08 844.77 17.79 0.69 4011 4047 844.77 851.55 15.22 0.65 4047 4091 851.55 856.05 16.98 0.68 4091 4119 856.05 861.64 16.23 1.08 4119 4155 861.64 865.73 17.29 0.44 4155 4180 865.73 870.12 17.46 0.63 4180 4207 870.12 873.86 14.53 0.63 4207 4231 873.86 877.90 14.28 0.61 4231 4257 877.90 882.65 17.28 0.40 4257 4287 882.65 887.39 14.68 0.57 4287 4316 887.39 893.55 14.89 0.62 4316 4356 893.55 898.60 14.92 0.57 4356 4388 898.60 903.62 12.85 0.66 4388 4420 903.62 908.62 18.81 0.44 4420 4452 908.62 912.53 19.98 0.74 4452 4477 912.53 919.26 14.74 0.62 4477 4521 919.26 925.24 16.80 0.55 4521 4561 925.24 930.48 15.12 0.65 4561 4594 930.48 937.78 14.55 0.56 4594 4642 937.78 943.66 16.16 0.70 4642 4680 943.66 949.50 12.23 1.62 4680 4719 949.50 957.00 15.00 0.84 4719 4768 957.00 965.08 12.89 0.69 4768 4822 965.08 971.85 17.19 0.87 4822 4866 971.85 979.86 17.85 0.74 4866 4919 979.86 984.83 15.87 0.57 4919 4951 984.83 990.43 15.50 0.58 4951 4991 990.43 994.69 17.97 0.74 4991 5020 994.69 999.91 14.60 0.45 5020 5054 999.91 1003.16 16.43 0.52 5054 5078 1003.16 1008.02 17.83 0.56 5078 5111 1008.02 1012.52 15.33 0.56 5111 5142 1012.52 1017.01 16.36 0.45 5142 5174 1017.01 1021.79 17.26 0.58 5174 5208 1021.79 1028.45 18.40 0.75 5208 5254 1028.45 1033.54 20.23 0.64 5254 5291 1033.54 1038.87 23.25 0.73 5291 5330 1038.87 1044.10 22.75 0.56 5330 5367 1044.10 1049.52 20.22 0.55 5367 5404 1049.52 1052.45 15.48 0.38 5404 5425 1052.45 1056.75 15.77 0.48 5425 5457 1056.75 1061.94 20.02 1.17 5457 5495 1061.94 1065.59 24.10 0.59 5495 5523 1065.59 1070.42 18.48 0.51 5523 5559 1070.42 1074.94 16.56 0.77 5559 5592 1074.94 1078.83 19.69 0.58 5592 5620 1078.83 1083.00 22.07 0.63 5620 5653 1083.00 1087.16 17.68 0.62 5653 5685 1087.16 1091.58 17.20 0.60 5685 5720 1091.58 1096.87 15.64 0.64 5720 5763 1096.87 1101.83 18.04 0.60 5763 5802 1101.83 1107.05 16.50 0.77 5802 5841 1107.05 1114.54 16.07 0.61 5841 5898 1114.54 1119.11 17.10 0.60 5898 5933 1119.11 1127.34 18.46 0.65 5933 5994 1127.34 1133.21 15.57 0.66 5994 6038 1133.21 1138.65 16.94 0.69 6038 6081 1138.65 1144.65 14.69 0.62 6081 6129 1144.65 1150.63 17.08 0.65 6129 6173 1150.63 1156.03 18.20 0.61 6173 6217 1156.03 1161.41 17.72 0.61 6217 6261 1161.41 1167.34 17.14 0.65 6261 6308 1167.34 1172.13 19.64 0.63 6308 6345 1172.13 1178.03 21.43 0.63 6345 6390 1178.03 1186.98 16.62 0.65 6390 6462 1186.98 1193.09 17.19 0.60 6462 6510 1193.09 1199.51 17.76 0.61 6510 6561 1199.51 1204.22 14.71 0.65 6561 6598 1204.22 1208.92 16.94 1.31 6598 6635 1208.92 1214.98 17.11 1.00 6635 6683 1214.98 1221.03 19.00 0.78 6683 6733 1221.03 1226.23 15.65 0.97 6733 6776 1226.23 1230.60 19.07 0.81 6776 6814 1230.60 1236.31 16.08 0.66 6814 6861 1236.42 1241.49 17.03 0.73 6861 6902 1241.49 1246.37 19.53 1.07 6902 6942 1246.37 1250.70 17.07 1.20 6942 6980 1250.70 1256.10 17.06 0.74 6980 7026 1256.10 1260.13 16.43 0.89 7026 7061 1260.13 1265.23 17.30 0.88 7061 7105 1265.23 1269.35 15.45 0.74 7105 7140 1269.35 1273.79 16.29 0.69 7140 7175 1273.79 1278.85 21.24 0.87 7175 7220 1278.85 1283.37 19.72 0.71 7220 7260 1283.37 1287.88 19.07 0.74 7260 7298 1287.88 1291.85 21.77 1.13 7298 7333 1291.85 1296.02 19.11 0.75 7333 7368 1296.02 1299.50 20.12 0.73 7368 7397 1300.02 1303.70 20.39 0.71 7401 7433 1303.70 1308.16 21.60 0.95 7433 7471 1308.16 1312.09 20.86 0.71 7471 7505 1312.09 1316.00 19.69 0.59 7505 7540 1316.00 1319.65 17.68 0.56 7540 7570 1319.65 1322.51 20.38 0.58 7570 7595 1322.51 1325.63 21.42 0.76 7595 7622 1325.63 1328.74 21.83 0.98 7622 7649 1328.74 1332.11 17.22 0.70 7649 7679 1332.11 1335.43 14.31 0.69 7679 7707 1335.43 1339.07 19.19 0.74 7707 7740 1339.07 1342.16 16.43 0.75 7740 7766 1342.16 1345.24 16.83 0.68 7766 7793 1345.24 1348.83 15.25 0.67 7793 7823 1348.83 1353.44 16.06 0.83 7823 7863 1353.44 1357.27 17.19 0.68 7863 7898 1357.27 1361.09 15.86 0.64 7898 7931 1361.09 1364.65 16.09 0.70 7931 7965 1364.65 1368.20 17.48 0.65 7965 7995 1368.20 1370.58 18.12 0.79 7995 8017 1510.18 1513.40 16.94 0.62 9376 9411 1513.40 1516.60 19.53 0.59 9411 9445 1516.60 1519.60 21.59 0.65 9445 9477 1519.60 1522.96 21.63 0.60 9477 9517 1522.96 1526.30 21.31 0.92 9517 9554 1526.30 1529.60 21.21 0.61 9554 9591 1529.60 1532.50 17.11 0.64 9591 9625 1532.50 1535.76 16.02 0.59 9625 9662 1535.76 1538.00 16.45 0.72 9662 9690 1538.00 1542.19 17.98 0.65 9690 9738 1542.19 1545.55 17.09 0.58 9738 9778 1545.55 1548.70 18.24 0.61 9778 9815 1548.70 1551.64 16.86 0.65 9815 9848 1551.64 1554.73 18.96 0.63 9848 9884 1554.73 1557.98 17.91 0.59 9884 9920 1557.98 1561.20 21.06 0.62 9920 9959 1561.20 1564.21 16.71 0.60 9959 9993 1564.21 1567.20 15.87 0.56 9993 10028 1567.20 1570.51 18.72 0.59 10028 10068 1570.51 1573.66 18.28 0.63 10068 10105 1573.66 1576.52 20.17 0.64 10105 10141 1576.52 1579.58 23.05 0.70 10141 10181 1579.58 1582.60 24.68 0.66 10181 10221 1583.10 1586.00 22.39 0.67 10228 10262 1586.00 1588.91 22.05 0.68 10262 10297 1588.91 1591.20 18.98 0.59 10297 10329 1591.20 1594.76 16.77 0.59 10329 10373 1594.76 1597.81 18.80 0.64 10373 10413 1597.81 1601.00 19.23 0.63 10413 10456 1601.00 1604.29 17.17 0.61 10456 10503 1604.29 1607.40 19.72 0.63 10503 10547 1607.40 1610.79 18.33 0.64 10547 10593 1610.79 1614.00 18.75 0.75 10593 10640 1614.00 1617.16 16.79 0.61 10640 10684 1617.16 1620.44 20.62 0.59 10684 10731 1620.44 1623.84 19.07 0.69 10731 10779 1623.84 1627.19 18.93 0.60 10779 10827 1627.19 1630.51 19.82 0.60 10827 10876 1630.51 1633.79 19.87 0.60 10876 10924 1633.79 1637.17 17.94 0.59 10924 10975 1637.17 1640.37 20.95 0.63 10975 11024 1640.37 1643.67 24.17 0.64 11024 11076 1643.67 1646.80 24.33 0.61 11076 11122 1646.80 1650.02 28.72 0.73 11122 11175 1650.02 1653.34 25.54 0.68 11175 11225 1653.34 1656.62 28.51 0.68 11225 11280 1656.62 1659.86 23.00 0.66 11280 11331 1659.86 1663.05 25.05 0.66 11331 11390 1663.05 1666.34 23.48 0.77 11390 11447 1666.34 1669.33 19.61 0.77 11447 11494 1669.33 1671.00 21.55 0.95 11494 11520 1671.06 1672.90 22.85 0.83 11521 11554 1672.90 1674.84 22.94 0.77 11554 11587 1674.84 1676.41 18.88 1.01 11587 11617 1676.41 1677.80 24.15 0.73 11617 11647 1677.80 1679.60 35.21 0.83 11647 11704 1679.60 1681.40 32.61 1.21 11704 11765 1681.40 1683.01 37.07 0.95 11765 11819 1683.01 1684.60 38.56 1.21 11819 11871 1684.60 1686.10 36.42 2.49 11871 11924 1686.10 1687.80 33.49 1.05 11924 11984 1687.80 1689.30 32.37 1.06 11984 12037 1689.30 1690.80 33.63 1.06 12037 12095 1690.80 1692.40 39.82 1.75 12095 12152 1692.40 1694.00 33.78 1.31 12152 12208 1694.00 1695.50 36.87 1.11 12208 12263 1695.50 1697.10 34.13 1.00 12263 12327 1697.10 1698.70 41.28 1.02 12327 12389 1698.70 1700.30 40.56 1.47 12389 12448 1700.30 1701.80 46.27 1.29 12448 12504 1701.80 1703.40 46.12 1.09 12504 12566 1703.40 1704.80 39.94 1.16 12566 12620 1704.80 1706.30 54.81 1.39 12620 12679 1706.30 1707.90 50.82 2.34 12679 12738 1707.90 1709.50 43.16 1.89 12738 12798 1709.50 1711.00 999999 999999 12798 12849 1711.00 1712.70 30.98 2.05 12849 12902 1712.70 1715.79 27.61 0.98 12902 12972 1715.79 1719.00 30.78 1.03 12972 13041 1719.00 1722.20 32.30 0.65 13041 13113 1722.20 1725.40 30.19 0.60 13113 13208 1725.40 1728.40 29.66 0.83 13208 13289 1728.40 1731.60 27.26 0.77 13289 13369 1731.60 1734.60 22.66 0.78 13369 13435 1734.60 1737.60 24.74 0.77 13435 13501 1737.60 1740.60 26.99 0.91 13501 13560 1740.60 1743.60 23.10 0.72 13560 13624 1743.60 1746.60 27.92 0.71 13624 13695 1746.60 1749.60 24.87 0.83 13695 13756 1749.60 1752.60 22.35 1.47 13756 13816 1752.60 1755.60 24.36 0.56 13816 13877 1755.60 1758.60 12.67 0.78 13877 13942 1758.60 1761.60 22.27 1.56 13942 14005 1761.60 1764.60 999999 999999 14005 14085 1764.60 1767.60 15.59 1.09 14085 14143 1767.60 1770.60 23.53 1.38 14143 14198 1770.60 1773.60 22.20 0.50 14198 14254 1773.60 1776.60 20.09 0.88 14254 14307 1776.60 1779.60 26.28 1.38 14307 14356 1779.60 1782.60 19.36 1.46 14356 14409 1782.60 1785.60 21.28 0.64 14409 14456 1785.60 1788.80 21.01 0.55 14456 14507 1788.80 1792.00 29.17 1.15 14507 14558 1792.00 1795.20 26.73 0.63 14558 14614 1795.20 1798.20 23.05 0.98 14614 14681 1798.20 1801.40 40.08 1.88 14681 14800 1801.40 1804.60 40.46 0.90 14800 14916 1804.60 1807.60 41.80 0.94 14916 15020 1807.60 1811.00 37.91 1.75 15020 15138 1811.00 1814.20 36.20 0.76 15138 15262 1814.20 1817.40 38.80 0.83 15262 15398 1817.40 1820.40 32.76 1.52 15398 15515 1820.40 1823.40 36.80 0.91 15515 15638 1823.40 1826.40 40.27 1.84 15638 15762 1826.40 1829.40 41.36 1.56 15762 15882 1829.40 1832.40 31.47 1.19 15882 16011 1832.40 1835.40 47.51 1.77 16011 16137 1835.40 1838.40 40.67 2.17 16137 16252 1838.40 1841.40 34.59 0.66 16252 16367 1841.40 1844.40 27.87 0.87 16367 16489 1844.40 1847.60 28.01 1.43 16489 16611 1847.60 1850.60 32.51 1.45 16611 16722 1850.60 1853.60 42.29 1.75 16722 16831 1853.60 1856.60 40.32 1.41 16831 16945 1856.60 1859.60 42.41 1.80 16945 17071 1859.60 1862.60 35.52 1.24 17071 17193 1862.60 1865.60 43.16 0.62 17193 17320 1865.60 1868.60 41.93 0.56 17320 17447 1868.60 1871.59 41.60 0.77 17447 17582 1871.59 1874.60 38.64 0.64 17582 17720 1874.60 1877.60 39.21 0.61 17720 17862 1877.60 1880.60 34.52 0.57 17862 18012 1880.60 1883.60 39.52 0.79 18012 18158 1883.60 1886.80 38.97 0.70 18158 18313 1886.80 1889.80 38.65 1.05 18313 18466 1889.80 1892.80 999999 999999 18466 18614 1892.80 1895.80 38.60 0.91 18614 18771 1895.80 1898.80 35.85 0.51 18771 18931 1898.80 1901.80 33.59 0.71 18931 19078 1901.80 1904.80 34.32 0.49 19078 19206 1904.80 1908.00 35.19 0.57 19206 19344 1908.00 1911.20 34.79 0.52 19344 19483 1911.20 1914.20 35.58 0.59 19483 19630 1914.20 1917.20 38.42 0.71 19630 19783 1917.20 1920.20 31.93 0.56 19783 19927 1920.20 1923.20 42.14 0.68 19927 20070 1923.20 1926.20 38.62 0.79 20070 20205 1926.20 1929.20 46.96 1.04 20205 20348 1929.20 1932.20 38.66 1.07 20348 20497 1932.20 1935.20 34.96 1.29 20497 20643 1935.20 1938.20 37.06 0.73 20643 20801 1938.20 1941.20 37.30 1.00 20801 20955 1941.20 1944.20 37.28 0.95 20955 21110 1944.20 1947.20 41.25 0.91 21110 21265 1947.20 1950.20 44.56 0.90 21265 21422 1950.20 1953.20 48.08 0.76 21422 21586 1953.20 1956.20 53.40 0.83 21586 21768 1956.20 1959.20 39.14 0.69 21768 21953 1959.20 1962.20 46.42 1.04 21953 22111 1962.20 1965.20 41.65 0.90 22111 22273 1965.20 1968.19 40.25 0.81 22273 22454 1968.19 1971.20 43.78 0.97 22454 22623 1971.20 1974.20 36.34 0.74 22623 22788 1974.20 1977.20 39.43 0.79 22788 22947 1977.20 1980.40 34.87 0.73 22947 23116 1980.40 1983.40 34.65 1.05 23116 23277 1983.40 1986.40 29.08 1.21 23277 23430 1986.40 1989.40 41.32 1.50 23430 23618 1989.40 1992.40 39.15 1.00 23618 23800 1992.40 1995.40 46.25 0.90 23800 23969 1995.40 1998.20 49.92 1.10 23969 24126 1998.20 2001.20 45.01 0.90 24126 24312 2001.20 2004.20 38.53 0.91 24312 24505 2004.20 2007.40 43.11 1.03 24505 24702 2007.40 2010.20 48.12 1.09 24702 24885 2010.20 2013.20 44.60 0.88 24885 25074 2013.20 2016.20 49.93 0.94 25074 25269 2016.20 2019.00 55.31 1.38 25269 25457 2019.00 2022.00 64.23 1.25 25457 25662 2022.00 2025.00 64.86 1.61 25662 25863 2025.00 2028.00 50.77 1.89 25863 26072 2028.00 2030.80 44.86 1.10 26072 26258 2030.80 2033.80 44.83 0.60 26258 26461 2033.80 2036.60 43.91 0.77 26461 26647 2036.60 2039.60 48.55 0.57 26647 26830 2039.60 2042.40 44.18 0.60 26830 27007 2042.40 2045.20 50.22 0.62 27007 27183 2045.20 2048.00 43.14 0.65 27183 27381 2048.00 2050.80 999999 999999 27381 27565 2050.80 2053.80 999999 999999 27565 27725 2053.80 2056.80 30.62 0.54 27725 27894 2056.80 2059.60 41.98 0.72 27894 28112 2059.60 2062.60 46.83 0.84 28112 28327 2062.60 2065.40 47.12 0.73 28327 28503 2065.40 2068.20 46.73 0.76 28503 28660 2068.20 2071.20 30.49 0.65 28660 28807 2071.20 2074.20 26.89 0.56 28807 28951 2074.20 2077.20 28.27 0.54 28951 29099 2077.20 2080.20 47.70 0.69 29099 29289 2080.20 2083.00 48.27 1.36 29289 29468 2083.00 2085.80 53.82 0.99 29468 29690 2085.80 2088.60 63.55 0.89 29690 29876 2088.60 2091.40 55.46 0.65 29876 30060 2091.40 2094.20 50.70 0.67 30060 30246 2094.20 2097.20 49.33 0.62 30246 30444 2097.20 2100.20 45.05 0.58 30444 30632 2100.20 2103.20 48.92 0.68 30632 30826 2103.20 2106.20 50.90 0.70 30826 31021 2106.20 2109.20 53.24 0.66 31021 31216 2109.20 2112.20 47.22 0.60 31216 31408 2112.20 2115.00 43.98 1.85 31408 31581 2115.00 2118.00 34.11 0.96 31581 31768 2118.00 2121.00 25.97 0.87 31768 31943 2121.00 2124.00 24.27 0.65 31943 32123 2124.00 2127.00 22.58 0.73 32123 32308 2127.00 2130.00 38.87 0.77 32308 32506 2130.00 2132.80 44.50 1.38 32506 32693 2132.80 2135.60 55.25 0.99 32693 32886 2135.60 2138.60 52.44 0.90 32886 33085 2138.60 2141.60 31.06 1.04 33085 33292 2141.60 2144.60 28.16 0.89 33292 33494 2144.60 2147.60 30.77 0.71 33494 33694 2147.60 2150.60 49.80 0.88 33694 33896 2150.60 2153.60 58.54 0.95 33896 34094 2153.60 2156.60 54.32 1.05 34094 34284 2156.60 2159.60 47.97 0.90 34284 34472 2159.60 2162.50 35.24 1.04 34472 34619 2162.50 2165.50 33.94 0.70 34619 34768 2165.50 2168.70 29.55 0.70 34768 34914 2168.70 2171.60 31.76 0.68 34914 35045 2171.60 2174.60 27.96 0.68 35045 35170 2174.60 2177.60 24.89 0.97 35170 35302 2177.60 2180.40 37.81 1.16 35302 35472 2180.40 2183.40 45.66 0.70 35472 35662 2183.40 2186.40 53.84 0.79 35662 35850 2186.40 2189.20 51.47 0.81 35850 36017 2189.20 2192.00 48.03 0.77 36017 36171 2192.00 2194.80 44.97 2.23 36171 36317 2194.80 2197.60 31.75 1.07 36317 36459 2197.60 2200.40 41.50 0.97 36459 36615 2200.40 2203.20 34.25 0.74 36615 36780 2203.20 2206.20 27.45 0.59 36780 36938 2206.20 2209.20 20.72 0.98 36938 37100 2209.20 2212.20 28.11 0.87 37100 37258 2212.20 2215.20 21.34 1.08 37258 37425 2215.20 2218.20 24.37 0.96 37425 37585 2218.20 2221.00 27.53 1.37 37585 37741 2221.00 2224.00 28.52 0.77 37741 37930 2224.00 2226.80 24.49 0.86 37930 38118 2226.80 2229.60 25.36 0.78 38118 38300 2229.60 2232.40 26.45 1.42 38300 38459 2232.40 2235.40 999999 999999 38459 38668 2235.40 2238.40 45.81 1.79 38668 38903 2238.40 2241.40 55.43 0.80 38903 39136 2241.40 2244.40 63.95 1.34 39136 39381 2244.40 2247.40 64.15 1.18 39381 39626 2247.40 2250.40 67.20 1.11 39626 39884 2251.01 2252.80 70.17 1.42 39934 40056