Ahung Co, Tibet Sediment Geochemistry ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: Ahung Co, Tibet Sediment Geochemistry LAST UPDATE: 3/2006 (Original receipt by WDC Paleo) CONTRIBUTORS: Carrie Morrill, NOAA Paleoclimatology, Jonathan Overpeck and Julia Cole, University of Arizona, Kam-biu Liu and Caiming Shen, Louisiana State University, and Lingyu Tang, Nanjing Institute of Geology and Paleontology IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-030 SUGGESTED DATA CITATION: Morrill, C., et al. 2006. Ahung Co, Tibet Sediment Geochemistry. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2006-030. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Morrill, C., J.T. Overpeck, J.E. Cole, K.-B. Liu, C. Shen, and L. Tang. 2006. Holocene variations in the Asian monsoon inferred from the geochemistry of lake sediments in central Tibet. Quaternary Research 65: 232-243. ABSTRACT: We present a record of monsoon variations for the early and middle Holocene that is inferred from the geochemistry of sediment cores from Ahung Co, a lake in central Tibet. The resolution of this record is better than 50 years and the age model is derived from radiocarbon ages of terrestrial charcoal, which eliminates errors associated with the lake hard-water effect. We made down-core geochemical measurements of: % carbonate, % organic carbon, C/N and d13C of bulk organic matter, d13C and d18O of carbonate, and % dolomite. Proxy calibration and modern water-balance reconstruction show that these are proxies for lake depth and the amount of monsoon precipitation. We find that lake level and monsoon precipitation have been decreasing at Ahung Co since the early Holocene (~7500 cal yr BP). Superimposed on this trend are rapid declines in monsoon rainfall at 7000-7500 and 4700 cal yr BP and seven century-scale wet-dry oscillations. The cores do not contain sediment from the last ~4000 years. Surface sediments from the lake accumulated during the 20th century, however. From this, we argue that lake levels have risen again recently following a late Holocene dry period. GEOGRAPHIC REGION: Tibet, central Asia PERIOD OF RECORD: 9 - 4 KYrBP FUNDING SOURCES: National Science Foundation ATM-9410491 and ATM-0082116, National Science Foundation Graduate Fellowship, Geological Society of America Graduate Student Research Grant, NASA Space Grant Graduate Fellowship DESCRIPTION: Geochemical data from cores 2A, 3A and 4A from Ahung Co, Tibet. Location: 31.62 N, 92.06 E, 4575 m elevation, 1.5 m lake maximum depth Data includes radiocarbon data, carbonate content, and d18O and d13C of bulk carbonates from all cores and organic carbon content, % dolomite, C/N and d13C of organic matter and d18O of carbonate encrustations from core 3A. Core depths reported as actual and composite. Composite depth scale is a scale to which each core was correlated. Precision of geochemical measurements is: % Carbonate: 0.02% % Organic carbon: 0.02% d18O carbonate: 0.07 per mil d13C carbonate: 0.02 per mil C/N: 0.12 d13C organic: 0.04 per mil % dolomite: 1% DATA: 1. Radiocarbon dates from Ahung Co sediment cores, per mil PDB. Calendar ages derived using CALIB radiocarbon calibration program v 4.3 and the calibration dataset of Stuiver et al. (1998), and are reported as a median with 2 sigma error range. Charcoal samples Lab# Core Actual depth mgC d13C 14Cage Error Calendar age AA50259 3A 2-4 0.1 N/A 3600 70 4090 (3890) 3690 AA44634 2A, 3A 8-10, 11-13 0.19 N/A 3480 90 3980 (3790) 3480 AA44636 2A, 3A 22-24, 20.5-2 0.2 -24.1 5090 80 6160 (5890) 5610 AA44638 2A, 3A 27-29, 27-29 0.15 N/A 5710 200 6990 (6490) 6000 AA44640 2A, 3A 38-40, 39-41 0.16 N/A 6640 340 8160 (7540) 6760 UCIT3388 2A 67-87 ~0.20 N/A 7070 90 8110 (7900) 7680 Note: UCIT3388 also contained terrestrial fly fragments. Samples marked N/A have no d13C measurements. Potamogeton samples Lab# Core CompDepth mg.C d13C 14Cage Error Calendar age AA41587 2A 0-1 1.26 -11.2 3810 60 4410 (4180) 3990 AA41589 2A 5-6 1.08 -10.6 4160 50 4830 (4700) 4530 AA42472 2A 9.5-10 0.87 -7.3 4250 40 4860 (4830) 4650 AA46143 2A 12-12.5 0.78 -6.5 4200 50 4850 (4820) 4550 AA46144 2A 16-16.5 0.5 -5 4430 50 5290 (5010) 4860 AA47723 2A 18-18.5 0.96 -5.4 4640 40 5470 (5420) 5300 AA46145 2A 20-20.5 0.87 -8.8 4990 60 5990 (5720) 5600 AA41591 2A 23-23.5 0.94 -11.6 5510 50 6410 (6290) 6200 AA42473 2A 28-29 1.22 -12.6 5660 50 6620 (6420) 6310 AA42474 2A 39-39.5 1.13 -13 6180 50 7250 (7090) 6910 AA47724 2A 47-47.5 0.97 -11.6 5980 60 6980 (6780) 6670 AA46146 2A 55-55.5 0.65 -10.9 6430 70 7460 (7370) 7250 AA47725 2A 58.5-58 0.8 -12.7 7240 60 8180 (8060) 7880 AA47241 2A 63-63.5 0.75 -11.3 7210 60 8170 (7990) 7880 AA47726 2A 68-68.5 1.11 -13.7 7740 60 8630 (8500) 8400 AA46147 2A 73-73.5 0.93 -11 8050 50 9080 (9010) 8770 AA47727 2A 80-80.5 0.78 -12.8 8570 60 9680 (9540) 9470 AA46148 2A 87-87.5 1.08 -18.1 8800 60 10150 (9850) 9560 AA41588 3A 0-1 1.15 -9.1 3610 50 4080 (3900) 3730 AA41590 3A 8-9 0.99 -11.3 3940 30 4500 (4410) 4290 AA42475 3A 12.5-13 1.01 -11.3 4110 40 4820 (4610) 4450 AA47729 3A 15.5-16 1.17 -6.7 4200 40 4840 (4820) 4570 AA47730 3A 17.5-18 1.06 -7.8 4170 50 4840 (4720) 4530 AA47240 3A 19.5-20.5 1.19 -10.2 4780 50 5600 (5510) 5330 AA41592 3A 21.5-22 0.94 -10.9 5260 40 6170 (5990) 5920 AA42476 3A 28-29 1.01 -10.8 5600 50 6490 (6370) 6290 AA42477 3A 40.5-41 0.76 -10.8 6070 80 7210 (6900) 6690 AA47728 3A 48-48.5 1.1 -12.2 6060 40 6970 (6820) 6800 AA47242 3A 52.5-53.5 1.36 -10.4 6400 60 7430 (7320) 7210 AA47731 3A 57-57.5 0.78 -11.9 6700 50 7660 (7570) 7480 AA47732 3A 62-62.5 0.86 -11 7200 40 8150 (7990) 7880 AA47243 3A 65.5-66.5 0.69 -11.5 6740 50 7680 (7600) 7510 AA47733 3A 71-71.5 0.93 -13.9 7210 50 8160 (7990) 7880 AA47734 3A 76-76.5 0.86 -12.2 7900 60 9000 (8670) 8540 AA47735 3A 84-84.5 0.64 -13.7 8420 70 9540 (9460) 9160 AA41585 4A 0-1 0.94 -12.2 3640 50 4090 (3940) 3780 AA42466 4A 8.5-9 1.04 -11.4 3920 40 4500 (4410) 4240 AA42467 4A 12-12.5 1.12 -10.2 4170 50 4840 (4720) 4530 AA47719 4A 16-16.5 0.95 -6.9 4190 50 4850 (4750) 4530 AA47720 4A 20-20.5 0.88 -11.8 5500 40 6400 (6290) 6200 AA47991 4A 23-23.5 1.33 -10.8 5390 40 6290 (6200) 6000 AA42468 4A 25-25.5 1.09 -11.5 5610 50 6490 (6360) 6290 AA42469 4A 28.5-29 1.22 -12.3 5760 50 6720 (6550) 6410 AA42470 4A 32-32.5 1.21 -11.6 5950 50 6590 (6770) 6660 AA42471 4A 38.5-39 1.1 -11.3 6310 50 7410 (7250) 7030 AA47244 4A 40.5-41 1.02 -9.6 6530 70 7570 (7430) 7280 AA47245 4A 47-47.5 1 -12.5 6890 100 7940 (7680) 7570 AA47721 4A 54-54.5 0.86 -15.6 6960 40 7920 (7770) 7670 AA47722 4A 58-58.5 0.84 -12.6 7130 40 8100 (7940) 7860 AA47246 4A 65-65.5 0.98 -11.4 6840 60 7790 (7670) 7580 2. Radiocarbon measurements of living Potamogeton and surface sediments from Ahung Co. per mil PDB. Apparent age calculated using a modern 14C activity of 108% (2001 conditions). Potamogeton growing in lake July 2001 Lab# Waterdepth mgC d13C 14Cactivity Error ApparentAge Error AA44630 120 1.12 -10.9 99.19 0.47 680 40 AA44630 120 0.87 -10.5 99.99 0.46 620 40 AA44630 120 0.84 -14.1 100.13 0.46 610 40 Bulk organic matter in surface sediments Lab# Water depth mgC d13C 14Cactivity Error AA46141 45 1.04 -23.1 96.48 0.37 AA46142 47 1.05 -23.1 98.83 0.63 AA46142 47 2.5 -23.1 92.86 0.6 3. Core 2A Column 1: Actual depth (cm) Column 2: Composite depth (cm) Column 3: Age (cal yrs BP) Column 4: % Carbonate Column 5: d13C carbonate (per mil PDB) Column 6: d18O carbonate (per mil PDB) Depth CompDepth Age %Carb d13C d18O 0.5 5.5 4183 41.58 1.1 -8.67 1 6 4210 39.08 0.9 -8.74 1.5 6.5 4236 37 0.83 -8.92 2 7 4263 52.75 1.88 -8.95 2.5 7.5 4290 57.58 1.46 -8.96 3 8 4317 54.75 1.42 -8.87 3.5 8.5 4344 54.33 1.59 -9.01 4 9 4371 44.92 1.05 -9.62 4.5 9.5 4398 41 0.42 -10.12 5 10 4425 43.83 0.15 -10.47 5.5 10.5 4452 46.67 0.56 -10.24 6 11 4479 54.33 0.92 -10.06 6.5 11.5 4506 58.33 1.87 -9.71 7 12 4533 58.92 0.63 -9.89 7.5 12.5 4559 49.67 -0.14 -9.95 8 13 4586 29.33 -1.65 -10.05 8.5 13.5 4613 17.5 -1.27 -9.98 9 14 4640 23.08 1.49 -10.37 9.5 14.5 4667 48.75 3.03 -10.95 10 15 4694 55.33 3.21 -11.15 10.5 15.5 4721 42.83 3.31 -11.03 11 16 4748 52.08 -999 -999 11.5 16.5 4775 49.42 3.66 -10.95 12 17 4802 31.42 2.85 -11.6 12.5 17.5 4829 60.92 -999 -999 13 18 4856 61.08 2.86 -11.71 13.5 18.5 4882 58.25 2.38 -11.45 14 19 4909 58.58 2.29 -11.01 14.5 19.5 4936 64.08 2.85 -10.71 15 20 4965 63.5 2.89 -10.62 15.5 20.5 5024 62.58 3.26 -10.66 16 21 5084 69.5 3.32 -10.86 16.5 21.5 5143 66.75 1.96 -11.56 17 22 5202 59.5 1.26 -11.81 17.5 22.5 5262 56.17 1.87 -11.5 18 23 5321 57.58 2.93 -11.16 18.5 23.5 5380 59.08 3.27 -10.89 19 24 5440 65.42 3.56 -10.96 19.5 24.5 5499 67 3.71 -10.91 20 25 5558 68.67 3.43 -11.01 20.5 25.5 5618 68.67 3.51 -11.12 21 26 5677 68.25 3.27 -11.19 21.5 26.5 5736 48.67 2.93 -10.99 22 27 5795 10.83 3.49 -9.49 22.5 27.5 5855 9.5 5.03 -8.1 23 28 6080 8.08 3.21 -9.31 23.5 28.5 6103 51.08 1.32 -11.16 24 29 6126 60.92 1.9 -11.07 24.5 29.5 6150 56.17 2.94 -10.81 25 30 6173 49.92 3.53 -10.73 25.5 30.5 6197 44 3.39 -10.74 26 31 6220 51.5 3.14 -10.78 26.5 31.5 6243 58.83 2.53 -10.96 27 32 6267 46.92 -0.31 -11.71 27.5 32.5 6290 31.33 -0.64 -12.04 28 33 6314 31.75 -0.86 -11.93 28.5 33.5 6337 37.42 1.41 -11.48 29 34 6360 53.5 2.05 -11.68 29.5 34.5 6384 44.08 2.64 -11.31 30 35 6407 51.5 2.46 -11.39 30.5 35.5 6430 48.67 2.16 -11.56 31 36 6454 43.17 1.91 -11.74 31.5 36.5 6477 41.5 2.59 -11.46 32 37 6501 46.75 2.97 -11.27 32.5 37.5 6524 56.75 2.55 -11.5 33 38 6547 64.25 1.87 -11.63 33.5 38.5 6571 55 0.88 -11.84 34 39 6594 58.58 0.82 -11.84 34.5 39.5 6617 62.75 0.57 -11.57 35 40 6641 52.25 0.39 -11.62 35.5 40.5 6664 42.67 0.31 -11.37 36 41 6688 38.25 0.07 -11.44 36.5 41.5 6711 40.83 0.03 -11.56 37 42 6734 58 -0.32 -11.89 37.5 42.5 6758 63.5 -0.55 -12.01 38 43 6781 53.08 -0.51 -11.93 38.5 43.5 6805 39.75 -0.76 -12.16 39 44 6828 40.42 -1.17 -12.65 39.5 44.5 6851 57.08 -0.53 -12.13 40 45 6875 61.08 0.51 -12.05 40.5 45.5 6898 58 1.71 -12.06 41 46 6921 46.58 2.41 -12.22 41.5 46.5 6945 54.58 1.87 -12.38 42 47 6968 62 1.53 -12.13 42.5 47.5 6992 61.58 1.65 -11.96 43 48 7015 67.42 1.52 -11.54 43.5 48.5 7038 61.83 1.8 -11.83 44 49 7062 59.17 1.78 -11.57 44.5 49.5 7085 56.42 1.57 -11.45 45 50 7109 57.92 1.38 -11.49 45.5 50.5 7132 57.25 1.26 -11.46 46 51 7155 54.17 1.43 -11.38 46.5 51.5 7179 52.67 0.93 -11.52 47 52 7202 55.83 1.19 -11.54 47.5 52.5 7225 56.33 1.3 -11.54 48 53 7249 58.58 1.09 -11.52 48.5 53.5 7272 58.42 1.12 -11.6 49 54 7296 58.83 1.21 -11.5 49.5 54.5 7319 57.17 1.38 -11.55 50 55 7342 53 1.18 -11.5 50.5 55.5 7366 54.67 1.32 -11.58 51 56 7389 54.83 1.18 -11.59 51.5 56.5 7413 55 0.52 -11.77 52 57 7436 55.83 1.09 -11.94 52.5 57.5 7459 66.67 2.47 -12.45 53 58 7483 66.42 2.11 -12.38 53.5 58.5 7506 68.92 2.45 -12.65 54 59 7529 67.92 3.24 -12.65 54.5 59.5 7553 68.5 3.25 -12.56 55 60 7576 70.42 2.72 -12.67 55.5 60.5 7600 61.25 1.57 -12.25 56 61 7623 52.42 0.37 -11.45 56.5 61.5 7646 58.5 -0.17 -11.72 57 68.5 7974 52.83 -0.49 -11.27 57.5 68.9 7991 54.42 -0.97 -10.54 58 69.3 8009 52.42 -0.63 -10.5 58.5 69.6 8026 52.33 -0.19 -10.97 59 70 8044 54.75 -0.07 -11.08 59.5 70.4 8061 48 -0.39 -10.2 60 70.8 8079 43.17 -0.36 -9.68 60.5 71.1 8097 53.33 -0.54 -9.79 61 71.5 8114 56.5 -0.6 -10.24 61.5 71.9 8133 56.92 -0.29 -10.53 62 72.3 8152 53.17 0.22 -10.31 62.5 72.7 8171 53.92 0.36 -9.98 63 73.1 8191 52.58 0.44 -9.97 63.5 73.5 8210 54.25 0.57 -10.08 64 74 8229 55 0.61 -10.12 64.5 74.4 8248 56.75 0.63 -10.38 65 74.8 8267 57.92 0.7 -11.02 65.5 75.2 8286 57.33 0.82 -11.02 66 75.6 8305 57.17 0.84 -11.33 66.5 76 8324 57.83 0.03 -11.6 67 76.7 8356 55.42 -0.27 -11.56 67.5 77.3 8387 53.67 -0.76 -11.43 68 78 8418 50.5 -0.45 -11.28 68.5 78.7 8449 49.58 0.04 -10.63 69 79.3 8480 42 -0.77 -10.25 69.5 80 8512 37.08 -1.48 -10.14 70 80.5 8535 44.75 -0.4 -10.91 70.5 81 8558 51.08 -0.09 -10.73 71 81.5 8582 56.33 -0.4 -11.24 71.5 82 8605 56 -0.54 -11.42 72 83.5 8675 63.25 -0.65 -11.68 72.5 83.8 8687 58.58 -0.53 -11.4 73 84 8699 46.25 -0.16 -10.33 73.5 84.3 8710 45.5 -0.32 -10.72 74 84.5 8722 47.67 -0.46 -11.06 74.5 84.8 8734 49.67 -0.57 -11.47 75 85 8745 50.83 -0.53 -11.48 75.5 85.5 8769 50.25 -0.21 -10.91 76 87 8839 53.83 -0.67 -10.64 76.5 87.3 8851 53.83 -0.48 -10.14 77 87.5 8862 50.25 -0.2 -9.48 77.5 88.1 8888 49.58 -0.45 -9.61 78 88.6 8914 50.17 -0.62 -9.94 78.5 89.2 8940 49.83 -0.48 -10.13 79 89.7 8966 52.58 -0.49 -10.17 79.5 90.3 8992 53.5 -0.33 -10.19 80 90.8 9018 48.67 -0.4 -10.43 80.5 91.4 9044 49.75 -0.35 -10.39 81 91.9 9070 51.58 -0.3 -10.54 81.5 92.5 9096 53.08 -0.3 -10.32 82 93 9120 47.92 -0.34 -10.18 82.5 93.5 9143 47.42 -0.41 -9.98 83 94 9166 48.17 -0.68 -10 83.5 94.5 9190 55 -1.1 -10.33 84 95 9213 53.83 -0.77 -10.41 84.5 95.5 9236 48.5 -0.51 -10.31 85 96 9260 50 -0.68 -10.03 85.5 96.5 9283 55.67 -0.81 -10.63 86 97 9307 52.67 -0.79 -10.37 86.5 97.5 9330 56.81 -1.13 -11 87 98 9353 61.06 -1.38 -11.32 87.5 98.5 9377 55.98 -1.47 -11.25 88 99 9400 51.4 -1.06 -11.08 88.5 99.5 9424 48.48 -0.41 -11.24 89 100 9447 -999 -0.32 -11.4 89.5 100.5 9470 -999 -0.37 -11.43 90 101 9494 -999 -0.38 -11.47 4. Core 3A Column 1: Actual depth (cm) Column 2: Composite depth (cm) Column 3: Age (cal yrs BP) Column 4: % Carbonate Column 5: % Organic Carbon Column 6: d13C carbonate (per mil PDB) Column 7: d18O carbonate corrected for dolomite (per mil PDB) Column 8: d18O encrustation (per mil PDB) Column 9: % Dolomite Column 10: C/N organic Column 11: d13C organic (per mil PDB) Column 12: PC#1 Column 13: PC#2 Column 14: PC#3 Depth CompDepth Age %Carb %OrgCarb d13C d18O d18Ocorr. d18Oenc Dolomite C/Norg d13Corg PC#1 PC#2 PC#3 0.5 2.5 4021 60.83 9.3 1.85 -9.68 -9.68 -9.5 -999 -999 -999 -999 -999 -999 1 3 4048 63.67 8 2.04 -9.73 -9.73 -10 0 17 -13.9 -1.87 1.1 -0.69 1.5 3.5 4075 64.75 7.36 1.79 -9.56 -9.56 -999 -999 -999 -999 -999 -999 -999 2 4 4102 65.25 8.86 0.51 -9.68 -9.68 -999 0 17.9 -15.1 -1.4 0.33 -0.64 2.5 4.5 4129 24.33 30.3 -0.82 -9.41 -9.41 -10.1 -999 -999 -999 -999 -999 -999 3 5 4156 12.17 35.68 -0.53 -9.19 -9.19 -8.7 0 21.5 -13.1 -3.44 -3.78 -1.69 3.5 5.5 4183 33.92 18.21 0.84 -9.07 -9.07 -999 -999 -999 -999 -999 -999 -999 4 5.8 4196 33.17 17.71 0.87 -9.16 -9.16 -8.6 0 18.4 -13.3 -2.84 -1.43 -1.71 4.5 6 4209 38.83 10.82 0.75 -9.15 -9.15 -999 -999 -999 -999 -999 -999 -999 5 6.3 4223 37.58 9.41 0.73 -8.97 -8.97 -999 0 14.1 -17.6 -1.22 -0.54 -2.86 5.5 6.5 4236 45.33 7.79 1.17 -9.32 -9.32 -8.9 -999 -999 -999 -999 -999 -999 6 7.2 4274 57.92 9.03 2.78 -9.44 -9.44 -999 0 13.5 -16.3 -1.24 1.68 -1.89 6.5 7.9 4312 54.33 12.02 1.34 -9.31 -9.31 -999 -999 -999 -999 -999 -999 -999 7 8.6 4349 61.67 12.3 1.87 -9.46 -9.46 -10.5 0 16.2 -14.6 -1.73 1.04 -1.19 7.5 9.3 4387 43.08 18.78 1.75 -9.65 -9.65 -999 -999 -999 -999 -999 -999 -999 8 10 4425 41.75 16.62 0.41 -10.17 -10.17 -999 0 16.2 -14.4 -1.55 -0.79 -1.03 8.5 10.8 4465 46.08 18.62 0.88 -9.88 -9.88 -9.7 -999 -999 -999 -999 -999 -999 9 11.5 4505 55.25 11.25 1.57 -9.62 -9.62 -9.4 0 13.9 -14.4 -1.43 0.9 -1.55 9.5 11.9 4526 45.75 16.14 2.11 -9.65 -9.65 -999 -999 -999 -999 -999 -999 -999 10 12.3 4546 45.33 15.76 0.89 -10.03 -10.03 -999 0 15 -13.6 -1.64 -0.17 -1.2 10.5 12.6 4566 39.75 22.62 -0.08 -9.64 -9.64 -999 -999 -999 -999 -999 -999 -999 11 13 4586 46.5 19.28 -1.15 -9.74 -9.74 -9.5 0 19.4 -12.4 -2.23 -1.77 -0.58 11.5 13.5 4613 32.42 24.25 -1.12 -9.58 -9.58 -9.8 -999 -999 -999 -999 -999 -999 12 14 4640 11.92 36.51 -0.33 -9.81 -9.81 -10.6 0 18.6 -12.3 -2.97 -3.24 -1.55 12.5 14.5 4667 13.58 35.39 1.72 -10.45 -10.45 -999 -999 -999 -999 -999 -999 -999 13 15 4694 60.25 9.16 3.31 -11.04 -11.04 -10.7 0 12.1 -15.7 -0.52 2.29 -0.56 13.5 15.4 4714 57.08 13.01 3.78 -10.77 -10.77 -10.8 -999 -999 -999 -999 -999 -999 14 15.8 4734 59 12.8 3.86 -10.89 -10.89 -10.9 0 14.4 -12 -1.9 2.08 -0.01 14.5 16.1 4754 56.25 14.26 3.64 -10.65 -10.65 -999 -999 -999 -999 -999 -999 -999 15 16.5 4775 53 15.28 3.57 -10.98 -10.98 -999 0 15.1 -10.8 -2.28 1.5 0.13 15.5 16.8 4793 42.33 19.3 3.41 -11.15 -11.15 -11.1 -999 -999 -999 -999 -999 -999 16 17.2 4810 48.5 14.28 3.59 -11.48 -11.48 -999 0 14.5 -11.1 -2.01 1.33 0.35 16.5 17.5 4828 61.17 8.63 3.46 -11.73 -11.73 -999 -999 -999 -999 -999 -999 -999 17 18 4855 61 6.48 2.94 -11.73 -11.73 -999 0 11.1 -15.8 0.04 2.31 -0.1 17.5 18.5 4882 57 8.48 2.46 -11.43 -11.43 -999 -999 -999 -999 -999 -999 -999 18 19 4909 59.5 8.52 2.8 -10.89 -10.89 -999 0 13.9 -12.9 -1.39 1.7 -0.16 18.5 19.7 4945 61.9 8.25 -999 -999 -999 -999 -999 -999 -999 -999 -999 -999 19 20.3 5005 64.33 8.01 3.29 -10.71 -10.71 -999 0 13.3 -15 -0.92 2.31 -0.49 19.5 21 5084 68.5 7.18 3.15 -10.62 -10.62 -999 -999 -999 -999 -999 -999 -999 20 21.5 5143 53 8.4 2.03 -11.39 -11.39 -12.1 0 16.6 -14.5 -1.17 0.54 0.42 20.5 27.5 6056 24 23.88 1.35 -10.95 -10.95 -11.5 -999 -999 -999 -999 -999 -999 21 28 6080 33.08 22.31 1.15 -10.42 -10.42 -11.5 0 17.1 -14 -1.99 -1.09 -0.85 21.5 28.3 6095 39.75 21.29 1.52 -10.68 -10.68 -10.8 -999 -999 -999 -999 -999 -999 22 28.7 6111 51.5 16.33 1.65 -11.04 -11.04 -11.3 0 14.7 -14.9 -0.9 0.59 -0.29 22.5 29 6126 43.08 21.89 2.37 -11.12 -11.12 -12.7 -999 -999 -999 -999 -999 -999 23 29.3 6142 56 14.3 3.34 -10.99 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-999 -999 -999 -999 -999 75 82 8605 58.42 8.65 -0.51 -11.17 -11.49 -999 1.9 14 -18.8 1.12 -0.04 -0.25 75.5 82.5 8628 60.42 9.23 -0.44 -11.41 -999 -999 -999 -999 -999 -999 -999 -999 76 83 8652 57.75 9.28 -0.28 -10.98 -11.26 -10.4 1.8 14.7 -17.5 0.56 -0.07 -0.23 76.5 83.5 8675 51.58 9.87 -0.4 -10.89 -999 -999 -999 -999 -999 -999 -999 -999 77 84 8699 48 17.17 -0.53 -11.25 -12.24 -999 5.8 20.5 -14.7 -0.1 -1.98 1.46 77.5 84.5 8722 51.42 11.95 -0.71 -11.53 -999 -999 -999 -999 -999 -999 -999 -999 78 85 8745 45 12.57 -0.86 -11.64 -12.37 -999 4.2 14.7 -17.8 1.29 -1.26 0.33 78.5 85.5 8769 47.75 6.05 -0.44 -11.34 -999 -999 -999 -999 -999 -999 -999 -999 79 86 8792 48.67 3.51 -0.53 -11.01 -11.88 -999 5.2 10.6 -21.4 2.61 -0.29 -1.06 79.5 86.5 8816 53.08 4.37 -0.64 -10.66 -999 -999 -999 -999 -999 -999 -999 -999 80 87 8839 53.58 6.07 -0.46 -10.16 -12.01 -999 11 16.7 -17.9 1.85 -1.37 0.28 80.5 87.5 8862 53.67 8.21 -0.53 -9.52 -999 -999 -999 -999 -999 -999 -999 -999 81 88 8886 50.08 7.34 -0.35 -9.61 -11.73 -999 12.8 15.7 -17.9 2 -1.5 -0.28 81.5 88.5 8909 50 4.11 -0.52 -10.11 -999 -999 -999 -999 -999 -999 -999 -999 82 89 8932 53.5 4.66 -0.49 -10.26 -11.91 -999 9.9 11.8 -19.1 2.62 -0.54 -0.67 82.5 89.5 8956 51.08 7.16 -0.33 -9.8 -999 -999 -999 -999 -999 -999 -999 -999 83 90 8979 50.67 5.34 -0.15 -9.72 -11.72 -999 12.1 12.4 -18.3 2.44 -0.78 -0.83 83.5 90.5 9003 54.58 3.34 0 -9.95 -999 -999 -999 -999 -999 -999 -999 -999 84 91 9026 45.42 2.63 -0.18 -10.19 -11.83 -12 9.9 12.9 -20.2 2.46 -1.02 -0.89 84.5 91.5 9049 42.5 3.56 -0.36 -10.62 -999 -999 -999 -999 -999 -999 -999 -999 85 92 9073 53.33 6.41 -0.2 -10.29 -12 -999 10.2 16.3 -17 1.52 -1.16 0.32 85.5 92.5 9096 58.92 6.09 -0.17 -10.42 -999 -999 -999 -999 -999 -999 -999 -999 86 93 9120 54.67 5.14 -0.39 -10.59 -11.8 -999 7.3 -999 -999 -999 -999 -999 5. Core 4A Column 1: Actual depth (cm) Column 2: Composite depth (cm) Column 3: Age (cal yrs BP) Column 4: % Carbonate Column 5: d13C carbonate (per mil PDB) Column 6: d18O carbonate (per mil PDB) Depth CompDepth Age %Carb d13C d18O 0.5 0 3887 55 -0.59 -8.56 1 0.5 3913 40.67 0.65 -9.29 1.5 1 3940 44 1.36 -9.43 2 1.5 3967 53 1.62 -9.56 2.5 2 3994 57.5 2.27 -9.64 3 2.5 4021 61.83 2.76 -10.19 3.5 2.9 4043 59.75 3.23 -9.98 4 3.3 4066 52.42 3.17 -9.88 4.5 3.8 4088 51 2.68 -9.71 5 4.2 4111 59.08 2.4 -9.59 5.5 4.6 4133 58.25 1.74 -9.27 6 5 4156 47.25 1.29 -9.26 6.5 6.2 4220 43.25 1.6 -9.22 7 7.4 4283 42.92 2.14 -8.96 7.5 8.6 4347 37.08 2.46 -9.12 8 9.8 4411 33.92 2.1 -9.51 8.5 10.1 4431 37.67 1.52 -9.48 9 10.5 4452 45.5 0.65 -10.31 9.5 11.3 4492 54.25 1.67 -9.3 10 12 4532 59.75 1.99 -9.28 10.5 12.4 4553 42.08 2.63 -9.55 11 12.8 4573 23.25 2.11 -9.58 11.5 13.1 4593 12.83 1.33 -9.4 12 13.5 4613 11.92 1.76 -9.35 12.5 14.6 4672 36.5 3.54 -10.5 13 15.7 4732 53.33 3.79 -10.77 13.5 16.8 4791 41.17 4.23 -11 14 17.2 4814 65.75 -999 -999 14.5 17.7 4838 68.25 4.5 -11.28 15 18.1 4862 68.58 4.6 -11.26 15.5 18.6 4885 65.67 -999 -999 16 19 4909 64.33 4.07 -11.13 16.5 19.7 4945 61.75 3.12 -10.76 17 20.3 5005 64.58 3.05 -10.74 17.5 21 5084 68 1.99 -11.59 18 22 5202 59.33 1.07 -11.77 18.5 27.8 5884 55.83 0.36 -11.85 19 28.1 6086 54.75 -0.25 -11.94 19.5 28.5 6103 45.5 0.27 -12.26 20 28.8 6115 44.08 0.74 -11.81 20.5 29 6126 52.33 0.87 -11.48 21 29.3 6138 55 1.41 -11.24 21.5 29.5 6150 61.08 2.64 -11.19 22 29.8 6162 59.08 3.2 -11.25 22.5 30 6173 58.33 3.61 -11.08 23 30.4 6192 57.17 3.17 -11.24 23.5 30.8 6210 57.92 3.28 -11.27 24 31.2 6228 54.5 3.37 -11.4 24.5 31.6 6246 56.08 3.34 -11.85 25 32 6265 54.67 2.33 -12.01 25.5 32.3 6283 39.25 0.47 -11.89 26 32.7 6301 36.08 -0.16 -11.36 26.5 33.2 6321 22.25 0.08 -10.2 27 33.6 6340 31.58 -999 -999 27.5 34 6360 40.25 0.78 -10.89 28 35.3 6419 24.83 0.02 -12.07 28.5 36.5 6477 21.67 0.56 -11.32 29 36.9 6497 22.58 1.71 -10.84 29.5 37.3 6516 69.08 1.92 -11.85 30 37.8 6536 71.33 2.2 -12.11 30.5 38.8 6586 59.58 1.43 -12.06 31 39.9 6637 47.67 1.39 -11.32 31.5 41 6688 44.58 1.39 -11.12 32 42 6734 43.17 0.55 -11.54 32.5 43 6781 34 -1.44 -12.51 33 44 6828 29.67 -1.61 -13.64 33.5 44.3 6840 38.33 -0.99 -12.47 34 44.5 6851 44.25 -0.88 -10.94 34.5 44.8 6866 37.08 -0.33 -10.96 35 45.1 6881 40.08 0.72 -10.87 35.5 45.5 6896 28.92 1.11 -10.71 36 45.8 6911 38.5 0.97 -11.01 36.5 46.1 6925 45.75 0.23 -11.46 37 46.4 6940 45.25 -0.33 -11.66 37.5 46.9 6964 44.25 -0.53 -11.17 38 47.4 6987 60.25 -0.56 -11.16 38.5 48 7015 58.5 -999 -999 39 56.5 7413 55 -0.69 -11.17 39.5 57.7 7466 59.75 0.12 -11.5 40 58.8 7520 69.17 1.81 -11.96 40.5 60 7576 71.75 2.63 -12.01 41 60.5 7600 60.5 0.87 -11.55 41.5 61 7623 56.33 -0.17 -11.64 42 61.5 7646 53.33 -0.59 -12.18 42.5 62 7670 50.33 -0.52 -12.04 43 62.5 7693 49.75 -0.93 -12.53 43.5 62.8 7708 52.92 -0.94 -12.31 44 63.1 7722 53.08 -0.55 -12.17 44.5 63.4 7737 51.33 -0.33 -12.23 45 63.8 7752 53.83 -0.21 -11.98 45.5 64.1 7766 54.33 -0.48 -12.35 46 64.4 7781 57.17 -0.67 -12.48 46.5 64.7 7795 55.5 -0.82 -12.67 47 65 7810 52.25 -0.52 -12.28 47.5 65.2 7819 53.83 -0.28 -12.29 48 65.4 7828 57.33 -0.47 -12.17 48.5 65.6 7837 55 -0.49 -12.19 49 65.8 7846 57.83 0.29 -12.02 49.5 66 7855 59.33 0.62 -11.83 50 66.2 7864 59.67 0.21 -12.02 50.5 66.3 7873 58.58 -0.21 -12.21 51 66.5 7882 59.08 -0.52 -12.56 51.5 66.7 7891 59 -0.32 -12.33 52 66.9 7900 60.33 -0.25 -12.31 52.5 67.1 7909 61 -0.2 -12.32 53 67.3 7918 57.83 -0.44 -12.44 53.5 67.5 7927 60.5 -1.06 -12.59 54 67.7 7937 57.58 -1.31 -12.47 54.5 67.9 7947 55 -1.41 -12.76 55 68.1 7957 47.17 -1.34 -12.68 55.5 68.4 7967 50.75 -0.93 -12.24 56 68.6 7977 51.5 -0.78 -11.77 56.5 68.8 7987 51.92 -0.87 -11.86 57 69 7997 55.67 -0.74 -11.81 57.5 69.5 8021 53.08 -0.5 -11.48 58 70 8044 50.42 -999 -999 58.5 70.5 8067 48.42 -999 -999 59 70.7 8077 52.5 -999 -999 60 71.1 8095 51.67 -999 -999 60.5 71.3 8105 55.5 -999 -999 61 71.5 8114 57.42 -999 -999 61.5 71.7 8123 54.08 -999 -999 62 71.9 8132 51.67 -999 -999 62.5 72.1 8140 47.42 -999 -999 63 72.3 8149 55.67 -999 -999 63.5 72.4 8158 55.08 -999 -999 64 72.6 8167 53.83 -999 -999 64.5 72.8 8175 50.17 -999 -999 65 73 8184 50.08 -999 -999 65.5 73.5 8208 53 -999 -999 66 74 8231 54.3 -999 -999