Pakitsoq Greenland Ice Outcrop Gas Stratigraphy Data 2004-2005 ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Pakitsoq Greenland Ice Outcrop Gas Stratigraphy Data 2004-2005 LAST UPDATE: 9/2010 (Original receipt by WDC Paleo) CONTRIBUTORS: Schaefer, H., V.V. Petrenko, E.J. Brook, J.P. Severinghaus, N. Reeh, J.R. Melton, and L. Mitchell. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2010-091 WDC PALEO CONTRIBUTION SERIES CITATION: Schaefer, H., et al. 2010. Pakitsoq Greenland Ice Outcrop Gas Stratigraphy Data 2004-2005. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2010-091. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Schaefer, H., V.V. Petrenko, E.J. Brook, J.P. Severinghaus, N. Reeh, J.R. Melton, and L. Mitchell. 2009. Ice stratigraphy at the Pâkitsoq ice margin, West Greenland, derived from gas records. Journal of Glaciology, Vol. 55, No. 191, pp. 411-421(11), June 2009. DOI: 10.3189/002214309788816704 ABSTRACT: Horizontal ice-core sites, where ancient ice is exposed at the glacier surface, offer unique opportunities for paleo-studies of trace components requiring large sample volumes. Following previous work at the Pâkitsoq ice margin in West Greenland, we use a combination of geochemical parameters measured in the ice matrix (d18Oice) and air occlusions (d18Oatm, d15N of N2 and methane concentration) to date ice layers from specific climatic intervals. The data presented here expand our understanding of the stratigraphy and three-dimensional structure of ice layers outcropping at Pâkitsoq. Sections containing ice from every distinct climatic interval during Termination I, including Last Glacial Maximum, Bølling/Allerød, Younger Dryas and the early Holocene, are identified. In the early Holocene, we find evidence for climatic fluctuations similar to signals found in deep ice cores from Greenland. A second glacial-interglacial transition exposed at the extreme margin of the ice is identified as another outcrop of Termination I (rather than the onset of the Eemian interglacial as postulated in earlier work). Consequently, the main structural feature at Pâkitsoq is a large-scale anticline with accordion-type folding in both exposed sequences of the glacial-Holocene transition, leading to multiple layer duplications and age reversals. ADDITIONAL REFERENCES: Petrenko, V.V., A.M. Smith, E.J. Brook, D. Lowe, K. Riedel, G. Brailsford, Q. Hua, H. Schaefer, N. Reeh, R.F. Weiss, D. Etheridge, and J.P. Severinghaus. 2009. (CH4)-C-14 Measurements in Greenland Ice: Investigating Last Glacial Termination CH4 Sources. Science, 324(5926): 506-508. Petrenko, V.V., J.P. Severinghaus, E.J. Brook, J. Muhle, M. Headly, C.M. Harth, H. Schaefer, N. Reeh, R.F. Weiss, D. Lowe, and A.M. Smith. 2008. A novel method for obtaining very large ancient air samples from ablating glacial ice for analyses of methane radiocarbon. Journal of Glaciology, 54(185): 233-244. Petrenko, V.V., J.P. Severinghaus, E.J. Brook, N. Reeh, and H. Schaefer. 2006. Gas records from the West Greenland ice margin covering the Last Glacial Termination: a horizontal ice core. Quaternary Science Reviews, Vol. 25, Issues 9-10, pp. 865-875, May 2006. Schaefer, H., M.J. Whiticar, E.J. Brook, V.V. Petrenko, D.F. Ferretti, and J.P. Severinghaus. 2006. Ice Record of d13C for Atmospheric CH4 Across the Younger Dryas–Preboreal Transition. Science, Vol. 313, pp. 1109-1112, 25 August 2006. doi: 10.1126/science.1126562 GEOGRAPHIC REGION: Greenland PERIOD OF RECORD: 24 - 11 KYrBP FUNDING SOURCES: National Science Foundation (USA) Grants OPP0221470 to Jeff Severinghaus and OPP0221410 to Edward Brook. Packard Fellowship (USA) to Jeff Severinghaus. American Chemical Society grant PRF 42551-AC2 (USA) to Hinrich Schaefer and Edward Brook. Danish Research Council grant 21-02-0504 (Denmark) to Niels Reeh. Canadian Foundation for Climate and Atmospheric Sciences grant MAMMOTH (Canada) to Joe Melton. DESCRIPTION: (90-30°N) All data are from ice samples collected in the 2004 and 2005 field seasons at the ancient ice outcrop of Pakitsoq (West Greenland) and supplement earlier work on this site (2001-2003; Petrenko et al., 2006). Data are from a network of sampling profiles whose details and exact positions are provided in Table 2 and Figure 3 of Schaefer et al. (2009). Measured data include air content, CH4 concentration [CH4], the 15N/14N ratio of N2 (d15N), the 18O/16O ratio of atmospheric O2 (d18Oatm) and of the ice matrix (d18Oice). Sample age is a function of distance along the sampling profile and may be reversed as a consequence of folding. Ages are reported only for shorter profiles where the parameters provided sufficient age control. Gas ages are derived by comparison with equivalent records from the Greenland Ice Sheet Project 2 core and placed on the gas age scale of Schaefer et al. (2006). Pakitsoq Greenland Ice Outcrop: Latitude: 69°25.83'N, Longitude: 50°15.20'W Precision is given as pooled standard deviations derived from triplicate measurements on each of 1-3 replicate samples per depth for [CH4] and as pooled standard deviations derived from duplicate analyses for d15N and d18O. Pooled standard deviations for 2004 are: [CH4]: 32 ppb (n=74). d15N: 0.009 ‰ (n= 51) d18O: 0.024 ‰ (n= 51) Pooled standard deviations for 2005 are: [CH4]: 22 ppb (n=174). d15N: 0.009 ‰ (n= 76) (all short profiles); 0.006 ‰ (n= 50) (PK05 EH). d18O: 0.024 ‰ (n= 76) (all short profiles); 0.027‰ (n= 50) (PK05 EH). No d15N and d18O duplicates were measured for the following profiles: PK04 BAS, PK04 BAN, PK05 MA. DATA: Column 1: (Profile) Distance for gas parameters in meters (m). Column 2: Gas age in 1000 years before 1950 AD (ka BP). Column 3: Air content in millilitre per gram of ice (ml/g). Column 4: Methane concentration [CH4] in parts per billion (ppb). Column 5: Standard deviation of replicate [CH4] analyses in parts per billion (ppb). Column 6: 15N/14N ratio of atmospheric N2 (d15N) in per mille (‰). Column 7: 18O/16O ratio of atmospheric O2 (d18Oatm) in per mille (‰). Column 8: (Profile) Distance for d18Oice in meters (m). Column 9: 18O/16O ratio of the ice matrix (d18Oice) in per mille (‰). 1. PK04 BAN Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) 0.05 15.669 0.098 425 41 0.464 1.031 0.05 -38.15 0.12 15.615 0.234 1290 41 0.463 1.056 0.12 -38.68 0.21 15.546 0.096 979 29 0.457 1.063 0.21 -38.95 0.32 15.461 0.092 436 29 0.45 1.079 0.32 -38.68 0.41 15.392 0.094 465 41 0.462 1.094 0.41 -39.17 0.51 15.315 0.093 546 29 0.464 1.081 0.51 -38.65 0.61 15.238 0.095 441 41 0.455 1.071 0.61 -39.22 0.7 15.169 0.094 441 29 0.452 1.138 0.7 -40.03 0.8 15.092 0.09 448 29 0.46 1.085 0.8 -37.53 0.91 15.007 n.a. n.a. n.a. 0.484 0.985 0.91 -38.69 1.02 14.922 0.093 474 29 0.461 0.902 1.02 -38.18 1.11 14.853 0.095 439 29 0.472 1.084 1.11 -38.07 1.2 14.784 n.a. n.a. n.a. 0.516 1.208 1.2 -38.37 1.27 14.730 n.a. n.a. n.a. 0.469 0.958 1.27 -38.17 1.33 14.684 0.092 477 29 0.489 1.118 1.33 -37.26 1.39 14.638 n.a. n.a. n.a. 0.549 1.037 1.39 -37.41 1.46 14.584 n.a. n.a. n.a. 0.623 1.036 1.46 -36.77 1.53 14.507 0.09 620 29 0.542 0.976 1.53 -36.95 1.61 14.419 0.091 638 29 0.49 0.999 1.61 -36.45 1.7 14.319 n.a. n.a. n.a. 0.492 1.022 1.7 -37.32 1.85 14.154 0.096 957 38 0.467 1.074 1.85 -34.07 1.98 14.011 0.094 995 29 0.48 1.02 1.98 -33.88 2.14 13.834 0.089 1400 38 0.447 1.015 2.14 -33.26 2.29 13.669 0.09 678 29 0.414 1.021 2.29 -33.48 2.38 13.570 0.098 1011 38 0.351 1.037 2.38 -34.11 2. PK04 BAS Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) 15.44 14.342 n.a. n.a. n.a. 0.612 1.044 15.44 -37.22 15.51 14.436 0.084 590 34 0.619 1.005 15.51 -36.99 15.62 14.584 n.a. n.a. n.a. 0.638 0.949 15.62 -37.23 15.71 14.599 0.09 618 34 0.614 1.062 15.71 -36.77 15.79 14.612 n.a. n.a. n.a. n.a. n.a. 15.79 -36.67 15.88 14.627 0.084 593 34 0.622 0.997 15.88 -36.57 15.98 14.643 0.09 603 25 0.592 0.863 15.98 -36.59 16.06 14.656 n.a. 618 34 0.551 0.950 16.06 -37.56 16.14 14.669 0.094 498 29 0.491 1.092 16.14 -37.51 16.23 14.684 0.092 510 41 0.467 1.116 16.23 -37.52 16.32 14.699 0.095 445 34 0.474 1.105 16.32 -37.35 16.44 14.718 n.a. 594 34 0.462 1.101 16.44 -37.97 16.53 14.733 0.093 456 41 0.46 1.104 16.53 -37.63 16.62 14.748 0.094 521 25 0.472 1.104 16.62 -38.15 16.72 14.764 0.104 534 34 0.452 1.032 16.72 -37.77 16.82 14.781 0.095 453 41 0.454 1.096 16.82 -37.97 16.91 14.795 0.092 467 34 0.451 1.083 16.91 -36.18 17 14.810 0.097 449 41 0.453 1.072 17 -38.73 17.09 14.825 0.095 468 25 0.45 1.092 17.09 -37.46 17.18 14.840 0.096 462 38 0.458 1.064 17.18 -37.85 17.29 14.858 n.a. n.a. n.a. 0.462 1.065 17.29 -37.38 17.39 14.874 0.097 471 29 0.473 1.022 17.39 -38.31 17.5 14.892 n.a. n.a. n.a. 0.453 1.05 17.5 -38.04 17.59 14.907 n.a. n.a. n.a. 0.454 1.075 17.59 -38.54 17.7 14.925 0.097 432 29 0.442 1.005 17.7 -36.93 3. PK04 TR Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) 1.06 12.168 0.099 552 34 0.301 0.783 1.06 -37.56 1.16 12.111 n.a. n.a. n.a. 0.356 0.832 1.16 -36.93 1.25 12.059 0.093 541 34 0.382 0.727 1.25 -37.29 1.36 11.996 0.093 501 20 0.384 0.698 1.36 -38.10 1.46 11.938 n.a. n.a. n.a. 0.373 0.684 1.46 -40.70 1.57 11.875 0.087 561 29 0.372 0.634 1.57 -40.06 1.68 11.812 0.098 598 34 0.381 0.659 1.68 -40.03 1.78 11.754 n.a. n.a. n.a. 0.386 0.688 1.78 -39.46 1.92 11.674 0.087 561 22 0.391 0.657 1.92 -41.04 2.01 11.622 0.091 537 20 0.401 0.659 2.01 -39.46 2.1 11.570 n.a. n.a. n.a. 0.384 0.615 2.1 -40.21 2.17 11.552 0.089 565 19 0.460 0.604 2.17 -37.36 2.23 11.537 n.a. n.a. n.a. 0.521 0.582 2.23 -38.40 2.29 11.522 0.086 716 20 0.527 0.596 2.29 -39.56 2.36 11.504 n.a. n.a. n.a. 0.519 0.599 2.36 -39.36 2.41 11.492 0.087 734 20 0.518 0.623 2.41 -39.35 2.47 11.477 0.081 746 19 0.530 0.613 2.47 -39.21 2.52 11.464 n.a. n.a. n.a. 0.543 0.628 2.52 -39.52 2.59 11.454 0.084 791 20 0.533 0.615 2.59 -39.21 2.65 11.445 n.a. n.a. n.a. 0.513 0.565 2.65 -39.20 2.72 11.435 n.a. 797 19 0.513 0.636 2.72 -38.99 2.84 11.418 0.085 766 17 0.512 0.592 2.84 -39.01 2.92 11.407 0.083 802 34 0.500 0.626 2.92 -37.69 3.01 11.394 0.09 776 19 0.496 0.562 3.01 -37.00 3.1 11.381 0.084 742 23 0.473 0.464 3.1 -38.47 3.18 11.369 n.a. n.a. n.a. 0.475 0.565 3.18 -38.04 3.27 11.356 0.086 728 36 0.471 0.606 3.27 -38.11 3.35 11.345 0.086 780 34 0.477 0.582 3.35 -37.71 3.43 11.333 n.a. n.a. n.a. 0.457 0.588 3.43 -38.48 3.53 11.319 0.083 846 36 0.458 0.630 3.53 -38.48 3.59 11.311 0.082 715 24 0.454 0.586 3.59 -37.94 3.7 11.295 0.091 828 34 0.458 0.585 3.7 -39.47 3.81 11.279 n.a. n.a. n.a. 0.447 0.594 3.81 -38.44 3.92 11.263 0.077 900 36 0.464 0.617 3.92 -37.57 4.03 11.247 0.091 768 34 0.430 0.610 4.03 -38.75 4.14 11.232 0.444 0.516 4.14 -39.27 4. PK04 B-profile Dist. d18Oice (m) (‰) (m) permille) -25 -38.7 -24.8 -39.04 -24.6 -37.76 -24.4 -38.43 -24.2 -38.23 -24 -38.41 -23.8 -38.29 -23.6 -38.23 -23.4 -37.97 -23.2 -38.67 -23 -38.49 -22.8 -38.68 -22.6 -38.52 -22.4 -38.61 -22.2 -38.03 -22 -38.88 -21.8 -38.67 -21.6 -38.59 -21.4 -38.37 -21.2 -38.67 -21 -38.16 -20.8 -38.56 -20.6 -38.87 -20.4 -38.74 -20.2 -39.06 -20 -38.59 -19.8 -38.29 -19.6 -38.54 -19.4 -38.59 -19.2 -37.1 -19 -38.37 -18.8 -38.51 -18.6 -37.58 -18.4 -37.17 -18.2 -38.05 -18 -37.75 -17.8 -37.87 -17.6 -37 -17.4 -38.09 -17.2 -38.04 -17 -37.8 -16.8 -37.8 -16.6 -37.27 -16.4 -36.82 -16.2 -37.32 -16 -37.56 -15.8 -37.16 -15.6 -37.32 -15.4 -37.94 -15.2 -38.29 -15 -36.93 -14.8 -37.32 -14.6 -38.24 -14.4 -37.67 -14.2 -37.35 -14 -37.37 -13.8 -37.03 -13.6 -35.55 -13.4 -34.22 -13.2 -36.72 -13 -36.14 -12.8 -35.23 -12.6 -37.15 -12.4 -36.73 -12.2 -38.54 -12 -38.21 -11.8 -37.28 -11.6 -37.47 -11.4 -36.23 -11.2 -35.25 -11 -35.64 -10.8 -36.16 -10.6 -36.35 -10.4 -35.9 -10.2 -36.34 -10 -36.37 -9.8 -36.57 -9.6 -36.73 -9.4 -36.73 -9.2 -36.91 -9 -35.53 -8.8 -35.41 -8.6 -35.31 -8.4 -33.77 -8.2 -34.37 -8 -34.41 -7.8 -34.53 -7.6 -33.93 -7.4 -34.81 -7.2 -36.71 -7 -36.71 -6.8 -36.17 -6.6 -35.96 -6.4 -36.59 -6.2 -36.53 -6 -35.87 -5.8 -35.29 -5.6 -35.72 -5.4 -36.19 -5.2 -35.45 -5 -34.18 -4.8 -34.82 -4.63 -36.25 -4.4 -36.72 -4.2 -38.09 -4 -38.72 -3.8 -39.43 -3.6 -38.04 -3.4 -38.54 -3.2 -38.16 -3 -38.55 -2.8 -38.7 -2.6 -37.58 -2.4 -38.78 -2.2 -39.05 -2 -38.07 -1.8 -38.02 -1.6 -38.38 -1.4 -38.4 -1.2 -37.99 -1 -39.81 -0.8 -39.66 -0.6 -40.32 -0.4 -38.62 -0.2 -37.02 -0.15 n.a. 0 -38.01 0.2 -37.53 0.4 -36.33 0.6 -35.78 0.8 -36.15 1 -36.25 1.2 -35.45 1.4 -36.12 1.6 -33.75 1.8 -33.61 2 -34.58 2.2 -36.7 2.4 -35.55 2.6 -34 2.8 -34.77 3 -34.95 3.2 -36.94 3.4 -36.51 3.6 -36.17 3.8 -36.27 4 -35.83 4.2 -37.04 4.4 -37 4.6 -37.19 4.8 -36.57 5 -36.99 5.2 n.a. 5.4 -35.58 5.6 -35.76 5.8 n.a. 6 -36.31 6.2 -35.85 6.4 -36.08 6.6 -36.17 6.8 -36.3 7 -36.17 7.2 -36.33 7.4 -36.2 7.6 -35.58 7.8 -35.73 8 -35.71 8.2 -35.69 8.4 -35.77 8.6 -36.2 8.8 -36.95 9 -36.75 9.2 -36.53 9.4 -36 9.6 -36.32 9.8 -36.46 10 -36.07 10.2 -35.72 10.4 -36.25 10.6 -37.53 10.8 -36.73 11 -37.02 11.2 -36.99 11.4 -36.2 11.6 -36.43 11.8 -36.23 12 -35.55 12.2 -35.13 12.4 -35.63 12.6 -35.17 12.8 -34.89 13 -35.63 13.2 -35.01 13.4 -34.85 13.6 -35.51 13.8 -35.38 14 -35.25 14.2 -35.58 14.4 -35.89 14.6 -36.23 14.8 -36.43 15 -36.48 15.2 n.a. 15.4 n.a. 15.6 -35.66 15.8 -36.03 16 -37.14 16.2 -37.21 16.4 -38.91 16.6 -37.92 16.8 -36.84 17 -37.05 17.2 -39.17 17.4 -39.85 17.6 -38.98 17.8 -38.92 18 -38.38 18.2 -37.59 18.4 -34.59 18.6 -34.6 18.8 -35.87 19 -36.46 19.2 -35.95 19.4 -35.6 19.6 -34.83 19.8 -34.82 20 -35 20.2 -35.46 20.4 -34.08 20.6 -34.17 20.8 -34.14 21 -34.45 21.2 -34.84 21.4 -34.9 21.6 n.a. 21.8 -34.46 22 -34.78 22.2 -33.7 22.4 -34.93 22.6 -35 22.8 -33.93 23 -33.37 23.2 -35.16 23.4 -34.05 23.6 -33.79 23.8 -34.37 24 -34.55 24.2 -33.64 24.4 -34.36 24.6 -34.03 24.8 -33.73 25.04 n.a. 5. PK04 C-profile Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) -21.03 n.a. 0.092 931 n.a. n.a. n.a. -25.0 -33.31 -20.60 n.a. 0.087 737 n.a. n.a. n.a. -24.8 -33.15 -19.86 n.a. 0.094 849 n.a. n.a. n.a. -24.6 -33.74 -18.98 n.a. 0.093 1011 n.a. n.a. n.a. -24.4 -33.64 -17.98 n.a. 0.093 974 n.a. n.a. n.a. -24.2 -34.11 -17.00 n.a. 0.092 938 n.a. n.a. n.a. -24.0 -34.05 -15.94 n.a. 0.088 1135 n.a. n.a. n.a. -23.8 -34.00 -14.93 n.a. 0.095 480 n.a. n.a. n.a. -23.6 -33.14 -13.30 n.a. 0.094 892 n.a. n.a. n.a. -23.4 -33.77 -12.77 n.a. 0.095 693 n.a. n.a. n.a. -23.2 -34.16 -12.00 n.a. 0.110 765 n.a. n.a. n.a. -23.0 -34.07 -10.90 n.a. n.a. 830 n.a. n.a. n.a. -22.8 -33.87 -10.53 n.a. 0.114 970 n.a. n.a. n.a. -22.6 -33.68 -9.61 n.a. 0.098 711 n.a. n.a. n.a. -22.4 -33.88 -9.07 n.a. 0.113 1101 n.a. n.a. n.a. -22.2 -34.10 -8.46 n.a. n.a. 1301 n.a. n.a. n.a. -22.0 -33.69 -7.96 n.a. 0.095 1286 n.a. n.a. n.a. -21.8 -34.58 -7.49 n.a. 0.109 731 n.a. n.a. n.a. -21.6 -33.99 -6.99 n.a. n.a. 1325 n.a. n.a. n.a. -21.4 -33.85 -6.50 n.a. n.a. 1335 n.a. n.a. n.a. -21.2 -34.69 -6.06 n.a. 0.092 1162 n.a. n.a. n.a. -21.0 -34.38 -5.38 n.a. 0.111 892 n.a. n.a. n.a. -20.8 -34.46 -5.03 n.a. n.a. 1411 n.a. n.a. n.a. -20.6 -34.75 -4.45 n.a. n.a. 1052 n.a. n.a. n.a. -20.4 -34.12 -3.49 n.a. 0.114 1026 n.a. n.a. n.a. -20.2 -34.28 -3.03 n.a. n.a. 968 n.a. n.a. n.a. -20.0 -35.14 -1.98 n.a. 0.093 856 n.a. n.a. n.a. -19.8 -34.37 -1.50 n.a. n.a. n.a. n.a. 0.402 0.839 -19.6 -34.65 -1.22 n.a. n.a. 962 n.a. 0.435 0.880 -19.4 -34.37 -0.92 n.a. n.a. 761 n.a. 0.423 0.893 -19.2 -34.74 -0.75 n.a. n.a. 928 n.a. 0.424 0.828 -19.0 -34.46 -0.44 n.a. 0.093 981 n.a. 0.430 1.015 -18.8 -35.08 -0.33 n.a. n.a. 1381 n.a. n.a. n.a. -18.6 -34.33 0.11 n.a. n.a. 761 n.a. n.a. n.a. -18.4 -34.86 3.60 n.a. 0.089 781 n.a. n.a. n.a. -18.2 -35.43 5.48 n.a. 0.086 1107 n.a. n.a. n.a. -18.0 -35.87 7.58 n.a. 0.087 923 n.a. n.a. n.a. -17.8 -35.50 10.00 n.a. 0.091 996 n.a. n.a. n.a. -17.6 -34.64 11.90 n.a. 0.090 856 n.a. n.a. n.a. -17.4 -35.97 13.55 n.a. 0.089 740 n.a. n.a. n.a. -17.2 -38.00 14.00 n.a. n.a. n.a. n.a. 0.548 0.543 -17.0 -37.99 14.53 n.a. n.a. n.a. n.a. 0.421 0.718 -16.8 -38.37 15.05 n.a. 0.093 1275 n.a. 0.446 0.948 -16.6 -39.38 15.53 n.a. 0.092 687 n.a. 0.503 1.078 -16.4 -39.64 16.02 n.a. 0.086 739 n.a. 0.628 1.020 -16.2 -38.51 16.22 n.a. 0.090 643 n.a. 0.477 1.209 -16.0 -37.13 16.38 n.a. 0.095 536 n.a. 0.473 1.124 -15.8 -37.35 16.75 n.a. 0.094 761 n.a. 0.478 1.097 -15.6 -37.18 17.03 n.a. 0.094 536 n.a. 0.466 1.041 -15.4 -38.06 17.47 n.a. 0.093 514 n.a. 0.472 1.078 -15.2 -38.34 18.00 n.a. 0.093 439 n.a. n.a. n.a. -15.0 -37.59 18.48 n.a. 0.097 384 n.a. n.a. n.a. -14.8 -36.00 20.02 n.a. 0.098 457 n.a. n.a. n.a. -14.6 -36.37 -14.4 -36.30 -14.2 -35.87 -14.0 -36.27 -13.8 -36.17 -13.6 -35.67 -13.4 -35.90 -13.2 -35.99 -13.0 -35.63 -12.8 -35.82 -12.6 -36.44 -12.4 -35.79 -12.2 -36.34 -12.0 -36.31 -11.8 -36.80 -11.6 -36.82 -11.4 -35.87 -11.2 -36.15 -11.0 -36.03 -10.8 -35.51 -10.6 -35.56 -10.4 -36.32 -10.2 -36.47 -10.0 -36.10 -9.8 -35.66 -9.6 -35.61 -9.4 -36.19 -9.2 -35.83 -9.0 -36.20 -8.8 -35.19 -8.6 -35.83 -8.4 -36.45 -8.2 -36.13 -8.0 -35.34 -7.8 -35.95 -7.6 -35.31 -7.4 -35.52 -7.2 -34.81 -7.0 -35.15 -6.8 -35.28 -6.6 -35.41 -6.4 -36.13 -6.2 -36.28 -6.0 -35.99 -5.8 -35.98 -5.6 -35.81 -5.4 -35.37 -5.2 -36.23 -5.0 -36.52 -4.8 -36.47 -4.6 -36.59 -4.4 -35.89 -4.2 -35.76 -4.0 -34.97 -3.8 -36.16 -3.6 -36.64 -3.4 -35.46 -3.2 -36.32 -3.0 -36.47 -2.8 -36.60 -2.6 -36.12 -2.4 -36.51 -2.2 -34.43 -2.0 -35.07 -1.8 -36.46 -1.6 -35.92 -1.4 -36.22 -1.2 -35.86 -1.0 -36.10 -0.8 -37.42 -0.6 -37.06 -0.5 n.a. -0.4 -37.07 -0.2 -38.31 0.0 -39.59 0.2 -39.01 0.4 -39.07 0.5 n.a. 0.6 -38.51 0.8 -37.18 1.0 -38.82 1.2 -38.39 1.4 -38.80 1.6 -37.43 1.8 -37.91 2.0 -38.47 2.2 -37.17 2.4 -37.64 2.6 -38.57 2.8 -38.07 3.0 -35.51 3.2 -34.88 3.4 -34.96 3.6 -34.61 3.8 -34.05 4.0 -34.09 4.2 -32.85 4.4 -33.81 4.6 -34.15 4.8 -33.92 5.0 -34.69 5.2 -34.67 5.4 -35.45 5.6 n.a. 5.8 -34.57 6.0 -34.99 6.2 -35.19 6.4 -35.03 6.6 -35.78 6.8 -35.81 7.0 -36.36 7.2 -35.78 7.4 -36.24 7.6 -34.79 7.8 -36.49 8.0 -36.75 8.2 -35.28 8.4 -34.69 8.6 -34.85 8.8 -35.22 9.0 -34.91 9.2 -35.21 9.4 -35.08 9.6 -34.89 9.8 -35.18 10.0 -34.52 10.2 -34.77 10.4 -34.77 10.6 -35.06 10.8 -34.92 11.0 -35.69 11.2 -34.82 11.4 -35.08 11.6 -37.18 11.8 -38.24 12.0 -39.01 12.2 -38.27 12.4 -39.50 12.6 -37.61 12.8 -35.55 13.0 -35.87 13.2 -35.78 13.4 -34.95 13.6 -34.04 13.8 -37.50 14.0 -37.05 14.2 -37.09 14.4 -36.94 14.6 -37.24 14.8 -37.99 15.0 -37.61 15.2 -37.98 15.4 -38.17 15.6 -37.97 15.8 -38.38 16.0 -38.42 16.2 -37.24 16.4 -37.30 16.6 -37.21 16.8 -37.09 17.0 -37.42 17.2 -36.38 17.4 -36.67 17.6 -37.63 17.8 -37.94 18.0 -37.93 18.2 -37.81 18.4 -37.50 18.6 -38.26 18.8 -37.13 19.0 -36.03 19.2 -36.95 19.4 -37.38 19.6 -37.52 19.8 -38.14 20.0 -37.63 20.2 -37.60 20.4 -38.15 20.6 -38.25 20.8 -38.97 21.0 -38.83 21.2 -38.80 21.4 -39.16 21.6 -38.60 21.8 -39.00 22.0 -38.81 22.2 -39.18 22.4 -39.68 22.6 -39.41 22.8 -38.14 23.0 -38.68 23.2 n.a. 23.4 -39.23 23.6 -38.76 23.8 -38.61 24.0 -38.68 24.2 -38.21 24.4 -37.57 24.6 -38.68 24.8 -38.32 25.0 n.a. 6. PK05 EH Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) 48.6 n.a. n.a. 809 n.a. 0.290 -0.131 45 -31.05 49.22 n.a. n.a. 904 n.a. 0.290 -0.142 45.2 -31.42 49.65 n.a. n.a. 890 n.a. 0.313 -0.089 45.4 -31.42 50.2 n.a. n.a. n.a. n.a. 0.299 -0.082 45.6 -30.49 50.7 n.a. n.a. 736 n.a. 0.302 -0.084 45.8 -31.62 51.2 n.a. n.a. n.a. n.a. 0.289 -0.058 46 -31.63 51.5 n.a. n.a. 746 n.a. 0.289 -0.056 46.2 -31.81 52.1 n.a. n.a. n.a. n.a. 0.293 -0.061 46.4 -31.58 52.6 n.a. n.a. 989 n.a. 0.292 -0.059 46.6 -31.31 53.1 n.a. n.a. 815 n.a. 0.290 -0.039 46.8 -31.35 53.55 n.a. n.a. 743 n.a. 0.287 -0.066 47 -31.75 53.95 n.a. n.a. n.a. n.a. 0.287 -0.042 47.2 -32.29 54.49 n.a. n.a. 871 n.a. 0.292 -0.050 47.4 -31.95 55 n.a. n.a. n.a. n.a. 0.285 -0.076 47.6 -32.1 55.55 n.a. n.a. 883 n.a. 0.280 -0.092 47.8 -31.52 56.05 n.a. n.a. n.a. n.a. 0.282 -0.061 48 -31.71 56.45 n.a. n.a. 767 n.a. 0.287 -0.112 48.2 -31.72 57.1 n.a. n.a. n.a. n.a. 0.288 -0.113 48.4 -30.61 57.48 n.a. n.a. 959 n.a. 0.279 -0.100 48.6 -30.58 57.83 n.a. n.a. 960 n.a. 0.284 -0.064 48.8 -31.45 58.37 n.a. n.a. 864 n.a. 0.289 -0.082 49 -31.57 58.84 n.a. n.a. n.a. n.a. 0.292 -0.182 49.2 -31.62 59.41 n.a. n.a. 936 n.a. 0.288 -0.032 49.4 -31.58 59.88 n.a. n.a. n.a. n.a. 0.294 -0.065 49.6 -31.38 60.6 n.a. n.a. 747 n.a. 0.297 -0.226 49.8 -32.14 60.92 n.a. n.a. 891 n.a. 0.304 -0.086 50 -32.99 61.4 n.a. n.a. 799 n.a. 0.305 -0.035 50.2 -31.98 61.85 n.a. n.a. n.a. n.a. 0.305 -0.085 50.4 -31.53 62.43 n.a. n.a. 735 n.a. 0.286 -0.009 50.6 -31.82 62.85 n.a. n.a. n.a. n.a. 0.289 -0.064 50.8 -31.56 63.6 n.a. n.a. 780 n.a. 0.298 -0.043 51 -32.54 64.15 n.a. n.a. n.a. n.a. 0.292 -0.036 51.2 -31.73 64.66 n.a. n.a. 746 n.a. 0.305 -0.122 51.4 -32.14 64.85 n.a. n.a. n.a. n.a. 0.272 -0.060 51.6 -31.9 65.57 n.a. n.a. 763 n.a. 0.299 -0.060 51.8 -32.26 66.01 n.a. n.a. n.a. n.a. 0.294 -0.083 52 -32.25 66.45 n.a. n.a. 836 n.a. 0.285 -0.039 52.2 -32.59 66.85 n.a. n.a. n.a. n.a. 0.304 -0.075 52.4 -32.4 67.56 n.a. n.a. 792 n.a. 0.288 -0.083 52.6 -32.47 67.94 n.a. n.a. 842 n.a. 0.287 -0.043 52.8 -32.66 68.3 n.a. n.a. 875 n.a. 0.285 -0.049 53 -32.28 68.86 n.a. n.a. n.a. n.a. 0.289 -0.019 53.2 -32.51 69.57 n.a. n.a. 757 n.a. 0.294 -0.067 53.4 -31.07 69.86 n.a. n.a. n.a. n.a. 0.295 -0.087 53.6 -31.47 70.91 n.a. n.a. 804 n.a. 0.296 -0.010 53.8 -31.76 71.3 n.a. n.a. n.a. n.a. 0.313 -0.010 54 -32.16 71.52 n.a. n.a. 862 n.a. 0.309 -0.060 54.2 -32.47 71.96 n.a. n.a. 789 n.a. 0.303 -0.032 54.4 -32.33 72.5 n.a. n.a. 800 n.a. 0.302 -0.047 54.6 -32.31 73.05 n.a. n.a. 1004 n.a. 0.258 0.023 54.8 -32.71 55 -32.23 55.2 -32.71 55.4 -31.98 55.6 -31.75 55.8 -32.21 56 -32.5 56.2 -31.91 56.4 -31.7 56.6 -31.49 56.8 -31.64 57 -31.35 57.2 -31.41 57.4 -30.94 57.6 -31.18 57.8 -31.81 58 -32.06 58.2 -31.71 58.4 -31.19 58.6 -31.37 58.8 -31.55 59 -32.21 59.2 -31.4 59.4 -31.41 59.6 -31.95 59.8 -31.15 60 -30.86 60.2 -31.32 60.4 -32.5 60.6 -31.92 60.8 -32.23 61 -32.06 61.2 -31.38 61.4 -31.44 61.6 -31.73 61.8 -32.12 62 -31.63 62.2 -31.5 62.4 -31.41 62.6 -31.29 62.8 -31.58 63 -31.26 63.2 -31.37 63.4 -32.11 63.6 -32.24 63.8 -32.23 64 -32.24 64.2 -32.69 64.4 -32.51 64.6 -32.15 64.8 -31.98 65 -32.18 65.2 -32.05 65.4 -31.92 65.6 -32.54 65.8 -32.17 66 -31.65 66.2 -31.68 66.4 -31.66 66.6 -31.76 66.8 -31.67 67 -31.42 67.2 -31.83 67.4 -31.73 67.6 -31.88 67.8 -31.65 68 -31.81 68.2 -31.7 68.4 -31.55 68.6 -31.65 68.8 -31.72 69 -31.58 69.2 -32.82 69.4 -31.43 69.6 -31.38 69.8 -32.2 70 -32.39 70.2 -32.15 70.4 -31.39 70.6 -31.37 70.8 -32.03 71 -31.77 71.2 -33.45 71.4 -33.46 71.6 -31.97 71.8 -32.14 72 -31.69 72.2 -31.19 72.4 -30.72 72.6 -31.78 72.8 -31.67 73 -32.24 73.2 -32.41 73.4 -31.31 73.6 -32.31 73.8 -32.09 74 -31.77 74.2 -31.82 74.4 -31.79 74.6 -31.84 74.8 -32.55 75 -32.62 7. PK05 MA Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) 1.13 n.a. n.a. 313 19 n.a. n.a. 0 -37.7 6.48 n.a. 0.108 1093 23 0.384 0.419 0.2 -37.375 7.88 n.a. 0.092 463 27 0.4 0.446 0.4 -37.22 9.5 n.a. 0.107 493 26 0.369 0.42 0.6 -37.3 10.22 n.a. 0.081 461 35 0.445 1.067 0.8 -37.51 10.67 n.a. n.a. 413 26 0.443 1.021 1 -37.88 11.16 n.a. 0.087 641 31 0.503 1.049 1.2 -38.03 11.65 n.a. 0.117 745 33 0.404 0.918 1.4 -38.025 12.06 n.a. 0.092 567 21 0.402 0.68 1.6 -37.81 12.7 n.a. 0.087 752 33 0.376 0.302 1.8 -37.59 13.17 n.a. 0.087 810 22 0.367 0.18 2 -37.565 13.58 n.a. 0.108 920 34 0.34 0.26 2.2 -37.525 14.44 n.a. 0.089 728 24 0.541 0.572 2.4 -37.905 14.91 n.a. 0.079 791 34 0.456 0.575 2.6 -38.4 15.36 n.a. 0.087 801 20 0.388 0.399 2.8 -38.1 15.86 n.a. 0.113 943 36 0.408 0.454 3 -37.28 16.23 n.a. 0.081 735 21 0.472 0.582 3.2 -37.135 16.65 n.a. 0.076 731 20 0.36 0.218 3.4 -37.635 17.14 n.a. 0.076 629 24 0.291 0.186 3.6 -37.27 17.54 n.a. 0.111 752 33 0.33 0.208 3.8 -36.47 18.05 n.a. 0.091 711 19 0.293 -0.01 4 -36.305 18.6 n.a. 0.084 747 22 0.325 0.046 4.2 -36.555 19.01 n.a. 0.079 752 30 0.321 0.003 4.4 -37.395 19.48 n.a. 0.115 713 28 0.327 0.042 4.6 -38.305 20.12 n.a. 0.09 794 20 0.362 0.268 4.8 -38.215 20.56 n.a. 0.11 760 27 0.502 0.564 5 -37.51 21.02 n.a. 0.079 731 21 0.529 0.596 5.2 -37.6 21.9 n.a. 0.11 796 28 0.401 0.419 5.4 -38.245 22.32 n.a. 0.088 806 22 0.388 0.403 5.6 -38.095 22.83 n.a. 0.131 1027 27 0.338 0.185 5.8 -37.92 23.35 n.a. 0.087 753 19 0.309 0.033 6 -37.86 23.83 n.a. 0.087 797 21 0.313 0.017 6.2 -37.665 24.38 n.a. n.a. 756 20 0.337 0.036 6.4 -37.76 24.61 n.a. 0.086 960 21 0.341 0.177 6.6 -38 25.34 n.a. 0.083 769 20 0.339 0.094 6.8 -37.905 25.85 n.a. n.a. 769 16 0.333 0.054 7 -37.185 26.94 n.a. 0.085 840 23 0.349 0.178 7.2 -37.07 27.45 n.a. 0.09 753 20 0.363 0.305 7.4 -35.175 27.8 n.a. 0.087 763 22 0.394 0.439 7.6 -35.325 28.24 n.a. 0.089 512 17 0.377 0.724 7.8 -37.34 28.9 n.a. 0.089 724 14 0.427 0.944 8 -37.57 29.52 n.a. 0.085 656 21 0.571 1.048 8.2 -37.675 30.13 n.a. 0.095 433 15 0.431 1.047 8.4 -37.335 31.1 n.a. 0.091 474 14 0.52 0.555 8.6 -37.465 32.15 n.a. n.a. 0.476 0.677 8.8 -37.51 33.68 n.a. 0.091 477 19 0.415 0.534 9 -37.44 34.39 n.a. 0.091 458 12 0.486 0.613 9.2 -37.48 34.99 n.a. n.a. n.a. n.a. 0.464 0.428 9.4 -37.545 35.62 n.a. 0.085 505 23 0.395 0.193 9.6 -37.27 36.11 n.a. n.a. n.a. n.a. 0.413 0.42 9.8 -37.49 36.56 n.a. n.a. 523 24 0.417 0.409 10 -38.115 36.8 n.a. n.a. n.a. n.a. 0.365 0.463 10.2 -38.015 37.6 n.a. 0.094 465 24 0.363 0.441 10.4 -37.85 38.22 n.a. n.a. n.a. n.a. 0.37 0.407 10.6 -37.875 39 n.a. 0.092 504 19 0.41 0.358 10.8 -37.595 39.56 n.a. n.a. n.a. n.a. 0.383 0.437 11 -36.27 40.11 n.a. 0.09 527 22 0.374 0.262 11.2 -34.695 40.75 n.a. n.a. n.a. n.a. 0.468 0.381 11.4 -34.9 41.16 n.a. 0.09 508 28 0.37 0.354 11.6 -35.8 41.72 n.a. n.a. n.a. n.a. 0.458 0.455 11.8 -36.59 42.48 n.a. 0.088 497 22 0.413 0.367 12 -37.905 43.11 n.a. n.a. n.a. n.a. 0.361 0.329 12.2 -38.55 43.83 n.a. 0.093 525 23 0.371 0.292 12.4 -36.535 44.38 n.a. n.a. n.a. n.a. 0.361 0.301 12.6 -34.5 45.5 n.a. n.a. n.a. n.a. 0.375 0.39 12.8 -34.08 46.05 n.a. 0.089 533 26 0.418 0.391 13 -33.75 46.94 n.a. n.a. n.a. n.a. 0.41 0.364 13.2 -33.565 47.28 n.a. 0.089 453 25 0.357 0.354 13.4 -33.305 47.94 n.a. n.a. n.a. n.a. 0.375 0.27 13.6 -33.465 48.34 n.a. n.a. n.a. n.a. 0.415 0.439 13.8 -34.235 48.88 n.a. 0.089 506 22 0.395 0.46 14 -35.1 50.34 n.a. 0.082 525 33 0.425 0.261 14.2 -37.085 50.78 n.a. n.a. n.a. n.a. 0.369 0.381 14.4 -38.945 51.22 n.a. 0.092 545 24 0.438 0.367 14.6 -39.195 51.7 n.a. n.a. n.a. n.a. 0.42 0.429 14.8 -38.845 52.06 n.a. n.a. n.a. n.a. 0.361 0.376 15 -37.475 52.55 n.a. n.a. n.a. n.a. 0.381 0.399 15.2 -35.6 53.04 n.a. 0.088 407 25 0.346 0.286 15.4 -34.7 53.5 n.a. 0.079 497 22 0.361 0.406 15.6 -34.565 54 n.a. n.a. n.a. n.a. 0.416 0.203 15.8 -34.66 54.35 n.a. n.a. n.a. n.a. 0.407 0.281 16 -35.77 55.55 n.a. 0.081 480 22 0.35 0.067 16.2 -37.015 55.85 n.a. n.a. n.a. n.a. 0.347 0.342 16.4 -36.15 56.25 n.a. n.a. n.a. n.a. 0.347 0.25 16.6 -34.825 56.95 n.a. n.a. n.a. n.a. 0.325 0.209 16.8 -34.265 57.48 n.a. 0.077 482 22 0.343 0.365 17 -34.15 58.22 n.a. n.a. n.a. n.a. 0.29 -0.08 17.2 -34.425 58.6 n.a. 0.074 540 22 n.a. n.a. 17.4 -34.49 17.6 -34.04 17.8 -33.045 18 -32.405 18.2 -32.445 18.4 -32.54 18.6 -32.565 18.8 -32.485 19 -32.38 19.2 -32.32 19.4 -32.405 19.6 -32.575 19.8 -32.705 20 -32.915 20.2 -33.91 20.4 -35.51 20.6 -37.095 20.8 -37.885 21 -37.855 21.2 -36.2 21.4 -34.85 21.6 -34.76 21.8 -34.42 22 -34.505 22.2 -34.415 22.4 -34.205 22.6 -33.955 22.8 -33.595 23 -33.1 23.2 -32.42 23.4 -31.875 23.6 -31.575 23.8 -31.595 24 -32.075 24.2 -32.59 24.4 -32.47 24.6 -32.395 24.8 -32.875 25 -32.715 25.2 -32.35 25.4 -32.655 25.6 -33.085 25.8 -32.995 26 -32.875 26.2 -32.925 26.4 -32.4 26.6 -32.045 26.8 -32.375 27 -32.475 27.2 -32.43 27.4 -32.695 27.6 -33.265 27.8 -33.46 28 -33.29 28.2 -33.14 28.4 -33.45 28.6 -33.935 28.8 -34.24 29 -35.185 29.2 -36.755 29.4 -37.1 29.6 -36.275 29.8 -35.63 30 -34.95 30.2 -35.31 30.4 -36.505 30.6 -37.63 30.8 -37.745 31 -37.045 31.2 -37.275 31.4 -37.555 31.6 -37.92 31.8 -38.52 32 -38.84 32.2 -39.29 32.4 -39.68 32.6 -39.34 32.8 -39.02 33 -38.535 33.2 -37.735 33.4 -37.775 33.6 -38.06 33.8 -38.295 34 -38.015 34.2 -37.76 34.4 -37.98 34.6 -38.17 34.8 -38.14 35 -38.28 35.2 -38.955 35.4 -38.8 35.6 -38.275 35.8 -38.195 36 -37.815 36.2 -37.25 36.4 -37.01 36.6 -37.295 36.8 -37.115 37 -36.89 37.2 -37.07 37.4 -37.655 37.6 -38.195 37.8 -37.765 38 -37.56 38.2 -37.89 38.4 -37.72 38.6 -37.245 38.8 -37.715 39 -38.065 39.2 -37.655 39.4 -37.285 39.6 -36.705 39.8 -36.535 40 -36.66 40.2 -36.955 40.4 -37.04 40.6 -36.765 40.8 -37.075 41 -37.3 41.2 -37.125 41.4 -37.18 41.6 -37.04 41.8 -36.64 42 -36.455 42.2 -36.65 42.4 -36.99 42.6 -37.215 42.8 -37.705 43 -37.545 43.2 -36.87 43.4 -36.525 43.6 -36.535 43.8 -36.675 44 -36.6 44.2 -36.96 44.4 -37.085 44.6 -36.535 44.8 -36.58 45 -37.08 45.2 -37.14 45.4 -36.98 45.6 -36.865 45.8 -36.965 46 -36.96 46.2 -37 46.4 -37.345 46.6 -37.22 46.8 -36.83 47 -36.825 47.2 -36.81 47.4 -36.66 47.6 -36.655 47.8 -36.74 48 -36.47 48.2 -36.205 48.4 -36.22 48.6 -36.545 48.8 -37.055 49 -36.745 49.2 -36.035 49.4 -35.185 49.6 -35.325 49.8 -36.755 50 -37.41 50.2 -37.6 50.4 -37.545 50.6 -36.865 50.8 -36.475 51 -36.52 51.2 -36.765 51.4 -37.08 51.6 -37.055 51.8 -36.74 52 -36.62 52.2 -36.73 52.4 -36.715 52.6 -36.43 52.8 -36.415 53 -36.885 53.2 -37.08 53.4 -36.725 53.6 -35.69 53.8 -35.82 54 -35.805 54.2 -35.71 54.4 -36.85 54.6 -37.51 54.8 -37.73 55 -37.13 55.2 -37.09 55.4 -37.065 55.6 -36.685 55.8 -36.86 56 -37.035 56.2 -37.365 56.4 -37.455 56.6 -37.125 56.8 -37.1 57 -37.21 57.2 -37.28 57.4 -37.15 57.6 -36.815 57.8 -36.82 58 -36.805 58.2 -36.24 58.4 -35.78 58.6 -35.8 58.8 -35.89 59 -36.045 59.2 -36.72 59.4 -37.33 59.6 -37.225 59.8 -37.06 60 -36.69 60.2 -36.36 8. PK05 TR2 Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) 14.36 14.442 0.089 914 32 0.408 0.994 14.55 14.515 0.091 632 30 0.471 1.051 14.73 14.584 0.082 692 30 0.610 1.025 14.79 14.607 0.082 654 32 0.566 1.092 14.99 14.684 n.a. n.a. n.a. 0.480 1.170 15.1 14.726 0.09 493 23 0.460 1.153 15.29 14.799 0.087 511 17 0.458 1.135 15.39 14.838 0.088 477 35 0.466 1.119 15.52 14.888 0.094 457 43 0.469 1.127 15.67 14.946 0.089 519 32 0.465 1.134 9. PK05 TR4 top Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) 14.38 14.563 0.075 665 22 0.611 1.024 14.53 14.584 0.086 611 22 0.615 1.042 14.71 14.609 0.096 614 21 0.597 1.035 14.84 14.628 0.083 622 45 0.595 1.034 14.99 14.649 0.08 608 20 0.490 1.115 15.24 14.684 0.12 659 39 0.460 1.158 15.47 14.716 0.072 485 25 0.449 1.101 15.62 14.738 0.082 562 23 0.458 1.124 15.73 14.753 0.114 478 22 0.442 1.107 15.88 14.774 0.124 496 27 0.460 1.069 10. PK05 TR4 bottom Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) 14.2 14.427 0.086 678 34 0.524 1.022 14.34 14.477 0.082 651 19 0.592 1.046 14.5 14.534 0.085 629 23 0.616 1.040 14.64 14.584 0.078 638 20 0.622 1.024 14.78 14.634 0.084 625 20 0.615 1.044 14.92 14.684 0.09 505 18 0.475 1.110 15.03 14.723 0.09 491 14 0.466 1.113 15.17 14.773 0.089 981 36 0.462 1.060 15.32 14.827 0.091 475 19 0.458 1.098 15.49 14.888 0.094 526 38 0.450 1.124 11. PK05 TR LGM Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm Dist18Oice d18Oice (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) (m) (‰) 13.72 13.964 0.09 785 43 0.429 0.925 13.78 -34.36 13.88 14.091 0.091 660 22 0.476 1.079 13.84 -33.42 14 14.315 0.087 713 19 0.521 1.062 13.9 -33.8 14.19 14.465 0.086 1096 20 0.611 1.104 13.95 -34.45 14.24 14.505 0.088 654 33 0.617 1.065 14.01 -37.14 14.34 14.584 0.086 639 20 0.624 1.063 14.05 -38.05 14.46 14.608 0.086 633 17 0.612 1.017 14.1 -37.67 14.51 14.617 0.088 598 37 0.531 1.164 14.15 -36.69 14.62 14.639 0.087 622 17 0.609 1.009 14.2 -37.01 14.7 14.655 0.1 635 21 0.490 1.154 14.25 -37.19 14.77 14.668 0.089 569 17 0.520 1.067 14.31 -36.22 14.85 14.684 0.093 476 21 0.461 1.139 14.36 -36.45 14.93 14.700 0.094 489 15 0.468 1.130 14.42 -36.48 15 14.713 0.089 498 19 0.466 1.115 14.46 -36.55 15.07 14.727 0.088 523 15 0.465 1.151 14.51 -36.17 15.13 14.739 0.09 504 18 0.466 1.060 14.55 -37.23 15.28 14.768 n.a. n.a. n.a. 0.453 1.026 14.61 -36.74 15.33 14.778 0.089 494 21 n.a. n.a. 14.66 -37.02 15.46 14.804 0.087 527 19 0.443 1.056 14.71 -37.2 15.53 14.817 0.091 526 18 0.453 1.125 14.75 -37.49 15.65 14.841 0.09 497 15 0.454 1.090 14.79 -37.25 15.75 14.860 0.091 465 20 0.447 1.125 14.84 -37.08 14.89 -37.87 17.41 17.263 0.085 389 19 0.416 1.015 14.95 -37.8 17.84 18.621 0.09 384 39 0.428 0.977 15.01 -38.94 18.15 19.600 0.092 436 31 0.409 1.032 15.06 -37.68 18.58 20.958 0.09 370 37 0.435 1.024 15.1 -37.55 18.68 21.274 0.091 391 23 0.437 1.049 15.16 -37.65 18.8 21.653 0.089 427 30 0.442 1.028 15.21 -37.12 18.9 21.969 0.093 392 29 0.44 1.01 15.26 -37.44 18.99 22.253 0.09 340 34 0.432 0.999 15.31 -37.55 19.17 22.821 0.09 365 34 0.428 1.046 15.35 -37.69 19.35 23.390 0.09 349 38 0.441 1.012 15.4 -37.55 19.44 23.674 0.093 400 29 0.438 1.004 15.45 -37.87 15.51 -37.66 15.55 -38.13 15.61 -37.87 15.67 -37.94 15.72 -38.62 15.78 -37.95 15.84 -37.89 18.62 -37.23 18.675 -37.39 18.825 -36.33 18.955 -36.7 19.015 -37.68 19.065 -36.91 19.115 -36.21 19.225 -37.73 19.275 -38.36 12. PK05 YD Dist. GasAge AirCont. CH4 CH4sig d15N d18Oatm (m) (ka BP) (ml/g) (ppb) (ppb) (‰) (‰) 0.93 11.631 0.089 744 19 0.403 0.784 0.99 11.624 0.089 693 26 0.356 0.792 1.06 11.616 0.087 669 16 0.313 0.750 1.12 11.609 0.095 589 31 0.294 0.796 1.18 11.603 0.08 531 30 0.313 0.795 1.24 11.596 0.092 725 23 0.319 0.760 1.35 11.584 0.089 543 17 0.371 0.724 1.47 11.570 0.09 588 33 0.374 0.685 2.04 11.506 0.09 526 33 0.396 0.665 2.1 11.499 0.09 559 22 0.451 0.629 2.16 11.492 0.095 720 16 0.480 0.678 2.23 11.484 0.08 671 34 0.512 0.641 2.29 11.478 0.087 737 22 0.509 0.621 2.41 11.464 0.081 728 21 0.531 0.614 2.47 11.457 0.079 776 23 0.517 0.621