Sajama Ice Core Gas Composition Data: Readme file --------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program --------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Sajama Ice Core Gas Composition Data LAST UPDATE: 9/2001 (Original receipt by WDC Paleo) CONTRIBUTORS: Todd Sowers and Richard K. Campen, Pennsylvania State University IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2001-062 SUGGESTED DATA CITATION: Sowers, T.A. and Campen, R.K., 2001, Sajama Ice Core Gas Composition Data, IGBP PAGES/World Data Center A for Paleoclimatology Data Contribution Series #2001-062. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCES: Campen, R. K., 2000, Measurements of gasses trapped in a South American ice core: Paleoatmospheric composition and inferred microbial activity, Master's Thesis, Pennsylvania State University, Completed May 2000, 146pp. Thompson, L.G., M.E.Davis, E.M.Thompson, T.A.Sowers, K.A.Henderson, V.S.Zagorodnov, P.N.Lin, V.N. Mikhalenko, R.K.Campen, J.F.Bolzan, J.Cole-Dai and B.Francou. 1998. A 25,000 year tropical climate history from Bolivian ice cores. Science, 282(5295), 1858-1864. FUNDING SOURCE: US National Science Foundation (Grant# ATM-9618067 to Todd Sowers/PSU) GEOGRAPHIC REGION: South America, Bolivian Altiplano PERIOD OF RECORD: 25 KYrBP-Present LIST OF FILES: Readme_Sajama_Gas.txt (this file), sajama_gas.xls (Microsoft Excel format) sajama_gas.txt (ASCII text format) DESCRIPTION: Sajama Ice Core, Bolivia · Latitude 18o 06'S · Longitude 68o 53'W · Elevation : 6542masl · Variable names : Depth; Gas Age; d15N ; Atm d18O; d(32/28) ; dAr/N2; dCO2/N2; CH4 · Variable units (meters below surface), (years before present), (‰ with respect to present), (‰ with respect to present), (‰with respect to present), (‰with respect to present), (‰ with respect to present), (ppbV) · Data precision (± 0.01m), (± 5-1,000 years), (±0.03‰), (±0.06‰), (±0.3‰), (±0.3‰), (±100‰), , (± 30 ppbV)) General Information about the Sajama Ice Cores Site Description and Analysis In June-July 1997, two ice cores to bedrock were recovered from the summit of the extinct Sajama volcano, Bolivia (18øS, 69øW, elevation 6540 m) and were subsequently transported back in a frozen state to the cold room facility at the Byrd Polar Research Center (BPRC). Core 1 (SjC1, 132.4 m) was sectioned in the BPRC laboratory into 5063 samples decreasing in thickness from ~15 cm at the top to ~1-2 cm at the base. Core 2 (SjC2, 132.8 m), drilled just 3m from the SjC1 site, was sampled more coarsely, only 803 samples collected from its length. Borehole temperatures ranged from -11.3 to -9.5øC and indicate that the glacier remains frozen to the bed. Sajama Results from Richard, K. Campen's Master's Thesis. "Measurements of gasses trapped in a South American ice core: Paleoatmospheric composition and inferred microbial activity." Pennsylvania State University, MS thesis completed in May of 2000, 146 pages "d18Oatm data was included in: Thompson, L. G., M. E. Davis, E. Mosley-Thompson, T. A. Sowers, K. A. Henderson, V. S. Zagorodnov, P.-N. LIn, V. N. Mikhalenko, R. D. Campen, J. F. Bolzan, J. Cole-Dai, and B. Francou, 'A 25,000 year tropical climate history from Bolivian ice cores', in Science, Vol 282, pg 1858-1865, 1998." Depth (mbs) Gas Age (yrs BP) d15N Atm d18O d(32/28) dAr/N2 dCO2/N2 CH4 37.00 2.7 0.13 0.06 0.8 7.6 24.2 1755 39.60 2.9 0.04 0.10 -1.7 2.5 -4.7 1732 44.05 16.9 0.11 0.11 -0.5 1.5 46.3 1359 47.89 37.8 0.30 0.19 1.6 3.6 4036.0 1228 47.89 37.8 0.10 0.11 -0.2 0.4 673.6 1202 49.04 44.1 0.06 0.18 -6.0 0.4 104.1 1089 51.56 57.8 -0.01 0.05 -3.9 -1.8 378.7 1069 56.19 83.1 -0.07 0.17 -9.2 -3.7 1525.9 963 58.34 94.8 -0.03 0.11 -10.8 -3.9 764.0 1010 61.03 162.9 -0.01 0.37 -27.6 -2.5 2189.4 61.11 165.8 -0.03 0.13 -6.4 -1.3 722.8 66.61 303.3 -0.01 0.10 -12.8 -5.6 470.2 761 68.44 573.9 0.04 0.26 16.6 38.3 4178.4 792 72.28 1290.9 -0.14 0.50 48.3 89.6 10923.0 1030 72.36 1304.6 -0.21 0.62 5.3 22.4 6754.6 831 73.46 1493.5 -0.01 0.08 -6.1 -1.2 2517.3 1020 73.54 1507.2 -0.06 0.16 -1.9 1.4 2252.8 951 78.02 2276.3 0.05 -0.41 -28.8 -2.9 1331.3 826 80.17 2445.3 -0.07 0.25 2.8 10.6 1731.7 805 82.14 2593.0 -0.05 0.25 -11.1 3.1 2241.5 902 82.22 2599.0 -0.03 0.15 -16.0 -4.3 2076.6 882 86.52 2921.5 0.00 0.25 -10.6 9.7 3640.9 961 90.59 3226.8 -0.11 0.65 -31.9 9.1 4804.7 1191 91.79 3316.8 -0.09 0.42 -9.3 18.6 4632.4 1210 94.60 3992.9 -0.06 0.23 -0.1 18.1 4199.6 1101 96.94 4604.1 0.08 -0.02 -15.5 -7.9 -2.7 816 97.02 4625.0 -0.05 0.14 -2.3 11.2 3474.3 935 99.86 5366.7 0.02 -0.03 -15.7 1.5 3126.9 1248 101.06 8235.7 0.15 -0.25 -31.9 -17.4 40.2 1901 101.14 8701.0 -0.02 -0.07 -18.1 -0.7 3637.1 1042 103.95 10308.3 -0.05 0.27 -22.2 -4.4 3745.8 1116 105.33 10845.0 -0.03 0.72 -15.6 -3.6 3006.6 1133 105.46 10895.6 0.15 0.54 -26.9 -12.8 9.9 1215 106.95 11475.0 0.19 0.27 -28.4 -29.0 94.0 877 107.03 11506.1 0.02 0.50 -13.9 -5.6 1272.8 600 107.47 11677.2 0.02 0.32 -14.0 -3.8 1539.1 757 107.90 11844.4 0.10 0.66 -31.3 -24.5 -2.9 829 107.98 11875.6 -0.03 0.68 -13.7 -4.0 2015.6 716 108.45 12058.3 0.00 0.77 -13.3 -6.0 1558.2 807 108.98 12264.4 -0.03 0.57 -13.7 -5.5 2672.8 692 109.06 12295.6 0.11 0.54 -27.3 -21.1 11.5 1012 110.03 12672.8 0.16 0.28 -32.7 -31.4 34.9 927 110.11 12703.9 0.00 0.54 -14.1 -6.0 2384.0 863 110.80 12972.2 0.04 0.01 -34.2 -13.7 65.1 1618 110.88 13003.3 -0.06 0.38 -23.7 -5.2 4620.3 1122 111.35 13186.1 0.26 0.12 -48.9 -12.6 50.8 1370 111.42 13213.3 -0.09 0.99 -30.6 43.1 18611.1 2287 111.57 13271.7 0.31 0.15 -38.3 83.9 21251.7 2371 112.62 13680.0 -0.12 0.99 -50.6 6.0 13343.0 2571 113.06 13851.1 -0.07 1.44 -19.4 -3.7 5396.5 1064 113.83 14150.6 0.16 0.46 -33.5 -12.8 22.3 837 113.91 14181.7 0.00 0.57 -28.2 -4.9 7237.6 1008 114.01 14220.6 0.33 0.10 -30.0 14.5 69.3 3004 114.11 14259.4 0.37 0.01 -32.1 15.1 91.5 3898 114.30 14333.3 0.22 0.13 -47.6 -31.9 39.3 1193 114.38 14364.4 -0.06 0.77 -27.4 -1.9 7991.2 1889 115.20 14683.3 0.14 0.83 -31.6 -33.4 10.5 941 115.28 14714.4 -0.04 1.09 -11.6 -6.1 3513.3 817 116.80 15305.6 0.23 0.64 -41.3 -45.6 100.4 992 116.88 15336.7 0.00 0.98 -12.3 -4.0 4083.8 843 117.77 15682.8 0.11 0.77 -8.4 -2.4 1117.2 877 118.82 16091.1 0.15 0.85 -20.1 -15.7 10.0 879 118.90 16122.2 0.12 0.71 -7.5 -2.2 4651.1 1084 119.49 16351.7 -0.04 1.04 -8.1 -2.2 3079.6 752 119.51 16359.4 0.07 0.84 -7.9 -3.3 3494.4 744 121.07 16966.1 0.13 0.89 -10.5 -1.8 -14.1 668 121.17 17005.0 0.13 0.88 -12.2 -4.1 -11.7 683 121.47 17121.7 0.00 0.90 -12.4 -5.1 3253.3 663 122.32 17452.2 0.13 0.76 -18.6 -5.7 703.1 768 124.31 18226.1 -0.05 1.17 -22.0 -5.3 3434.6 693 125.96 18867.8 0.07 0.84 -14.4 -1.4 3954.6 715 126.04 18898.9 -0.02 0.93 -14.2 -2.7 3838.5 742 128.19 19735.0 -0.01 0.89 -15.8 -6.1 4056.9 701 128.92 20018.9 -0.04 0.98 -16.2 -8.3 4594.9 706 129.97 20427.2 -0.02 0.96 -10.7 -1.6 4006.7 799 130.05 20458.3 0.00 0.93 -16.2 -7.3 4285.2 812