Lynch's Crater 45,000 Year Optical Absorption Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: Please cite original reference when using these data, plus the data file URL and date accessed. NAME OF DATA SET: Lynch's Crater 45,000 Year Optical Absorption Data LAST UPDATE: 12/2011 (Original receipt by WDC Paleo) CONTRIBUTORS: Turney, C.S.M., A.P. Kershaw, S.C. Clemens, N. Branch, P.T. Moss, and L.K. Fifield IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2011-149 WDC PALEO CONTRIBUTION SERIES CITATION: Turney, C.S.M., et al. 2011. Lynch's Crater 45,000 Year Optical Absorption Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2011-149. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Turney, C.S.M., A.P. Kershaw, S.C. Clemens, N. Branch, P.T. Moss, and L.K. Fifield. 2004. Millennial and orbital variations of El Niño/Southern Oscillation and high-latitude climate in the last glacial period. Nature, Vol. 428, No. 6980, pp. 306-309, 18 March 2004. doi:10.1038/nature02386 ABSTRACT: The El Niño/Southern Oscillation (ENSO) phenomenon is believed to have operated continuously over the last glacial-interglacial cycle. ENSO variability has been suggested to be linked to millennial-scale oscillations in North Atlantic climate during that time, but the proposals disagree on whether increased frequency of El Niño events, the warm phase of ENSO, was linked to North Atlantic warm or cold periods. Here we present a high-resolution record of surface moisture, based on the degree of peat humification and the ratio of sedges to grass, from northern Queensland, Australia, covering the past 45,000 yr. We observe millennial-scale dry periods, indicating periods of frequent El Niño events (summer precipitation declines in El Niño years in northeastern Australia). We find that these dry periods are correlated to the Dansgaard-Oeschger events - millennial-scale warm events in the North Atlantic climate record - although no direct atmospheric connection from the North Atlantic to our site can be invoked. Additionally, we find climatic cycles at a semiprecessional timescale (~11,900 yr). We suggest that climate variations in the tropical Pacific Ocean on millennial as well as orbital timescales, which determined precipitation in northeastern Australia, also exerted an influence on North Atlantic climate through atmospheric and oceanic teleconnections. GEOGRAPHIC REGION: Northeast Australia PERIOD OF RECORD: 45 KyrBP - present FUNDING SOURCES: The National Geographic, the ARC, Monash University, The Royal Society, ANSTO, and NERC. DATA FILE URLS: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/lynchs2004.txt ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/australia/lynchs2004.xls DESCRIPTION: Optical absorption data from Lynch's Crater, Queensland, Australia, as a proxy for peat decomposition (humification) and surface wetness at the time of peat deposition. High values of absorption are interpreted as reflecting dry surface conditions, because increased microbial activity under aerobic conditions increases the degree of peat humification. The chronology for the sequence is provided by 15 radiocarbon ages over the 45,000 year record. Lynch's Crater pollen data are available from WDC Paleo and the Indo-Pacific Pollen Database: http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:6452 Lynch's Crater: 17°22'S, 145°42'E. DATA: 1. Turney et al. 2004 Lynch's Crater 1998 Core 14C data Depth,m Laboratory code 14C yrs B.P. (±1S) ABA-SC 1.55 ANUA-15508 9,600 ± 115 1.89 OZG-097 9,910 ± 50 2.05 ANUA-11524 10,200 ± 200 2.15 OZG-096 10,830 ± 50 2.32 OZG-095 12,180 ± 70 2.72 OZG-094 14,560 ± 70 2.92 OZG-093 16,680 ± 50 3.85 ANUA-24330 20,560 ± 217 4.6 ANUA-11523 22,130 +500 -470 5.5 ANUA-23621 25,070 +570 -530 6.75 ANUA-11522 29,230 +720 -660 7.55 ANUA-11509 27,900 +290 -280 8.95 ANUA-11525 35,550 +1060 -940 9.42 ANUA-23620 36,660 +740 -680 10.85 ANUA-14120 45,270 +1780 -1450 12.5 ANUA-11520 44,980 +2300 -1790 14.45 ANUA-15506 45,640 +1740 -1430 15.9 ANUA-11519 47,860 +3530 -2440 20 ANUA-12306 ‘Background’ 2. Turney et al. 2004 Lynch's Crater 1998 Core absorption data Table 1. 1998 Core %absorption data Depth (cm) %A 6 62.3 11 79.5 16 81.1 21 79.6 26 85.7 31 95.93 36 90.83 41 93.99 46 88 51 89.8 56 80.7 61 85.9 66 48.5 71 81.6 76 84.2 81 88.6 86 80.6 91 80.7 96 83.3 101 86.9 106 47.4 111 77.5 116 75.1 121 90.7 126 59.7 131 78.7 136 71.3 141 88.7 146 67.6 151 84.3 156 53.4 161 76.8 166 77.4 171 85.4 176 68.1 181 82.6 186 65.9 191 87.3 196 48.1 201 87 206 74 211 83.8 216 67.5 221 71.1 226 64.6 231 81.2 236 53 241 83.4 246 63.3 251 78.7 256 54.7 261 73.8 266 46.1 271 78.5 276 73 281 73.1 286 38.6 291 70.4 296 64.1 301 69.6 306 35.9 311 67.8 316 51.4 321 61.5 326 50.2 331 61.5 336 51.5 341 70.4 346 43.9 351 78.7 356 50.7 361 73.5 366 53.7 371 61.3 376 46.7 381 60.4 386 54.7 391 53.9 396 34.5 401 79.6 406 57.2 411 62.5 416 42.7 421 81 426 58.2 431 71 436 68.2 441 61.9 446 66.2 451 50.1 456 52.9 461 61.5 466 53.5 471 61.8 476 51.4 481 64.7 486 64.8 491 61.1 496 66 501 70.6 506 45.4 511 51.5 516 49 521 55.7 526 63.8 531 75.3 536 56 541 77.1 546 37.9 551 33.6 556 49.4 561 35.2 566 44 571 51.5 576 50.6 581 36.9 586 38.6 591 38 596 32.5 601 31 606 34.9 611 36.8 616 61.4 621 44.1 626 42 631 35.3 636 38.1 641 32.1 646 41 651 32.6 656 37.9 661 60.7 666 65.4 671 44.1 676 31.4 681 54 686 44.9 691 36.6 696 56.5 701 66.7 706 57.6 711 59.7 716 44 721 64.1 726 42.3 731 44.2 736 29.4 741 48.7 746 29.2 751 60.4 756 51.8 761 48.9 766 33 771 38.1 776 34.2 781 31.8 786 45.6 791 71.7 796 9.3 801 48.3 806 38.4 811 47.2 816 46.6 821 60 826 49.2 831 67.3 836 60 841 71.5 846 45.3 851 63.2 856 53.4 861 68.4 866 46.3 871 69.7 876 51.6 881 51.6 886 35.3 891 71.3 896 51.6 901 63.9 906 71.4 911 66.3 916 59.8 921 68.3 926 55 931 63.3 936 43.3 941 73.3 946 68.4 951 63.5 956 52 961 61.8 966 60.2 971 51 976 48.8 981 63.2 986 42.5 991 48.1 996 37.3 1001 49.1 1006 40.4 1011 36.1 1016 54.7 1021 50.1 1026 35.8 1031 41.1 1036 48.2 1041 61.9 1046 58.5 1051 45.9 1056 42 1061 45.8 1066 31.5 1071 57.4 1076 37.8 1081 39.8 1086 39.2 1091 41.6 1096 38 1106 24.5 1116 58.3 1126 40.4 1136 36.8 1146 35.2 1156 35.2 1166 41.9 1176 50.3 1186 60.7 1196 30.6 1206 36.7 1216 40.3 1226 46.2 1236 43.7 1246 49.3 1256 49.3 1266 72.5 1276 72.5 1286 39.6 1296 33.4