Eastern Equatorial Pacific MD02-2529 Thermocline d18O Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Eastern Equatorial Pacific MD02-2529 Thermocline d18O Data LAST UPDATE: 10/2009 (Original receipt by WDC Paleo) CONTRIBUTOR: Guillaume Leduc, GPI Kiel University IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2009-111 WDC PALEO CONTRIBUTION SERIES CITATION: Leduc, G., et al. 2009. Eastern Equatorial Pacific MD02-2529 Thermocline d18O Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2009-111. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Leduc, G., L. Vidal, O. Cartapanis, and E. Bard. 2009. Modes of eastern equatorial Pacific thermocline variability: Implications for ENSO dynamics over the last glacial period. Paleoceanography, 24, PA3202, doi:10.1029/2008PA001701. ABSTRACT: Changes in El Nino-Southern Oscillation (ENSO) variability are difficult to extract from paleoceanographic reconstructions because they are superimposed on changes in seasonal variability that modulate the first-order climate signal. Here we address this problem by reconstructing thermocline structure from a marine sediment core retrieved from the eastern equatorial Pacific. At the core location, changes in hydrologic parameters within the thermocline are linked to ENSO activity, with a reduced influence of seasonal variability compared to surface waters. We performed repeated isotopic analyses (d18O) on single specimens of the thermocline-dwelling planktonic foraminifera Neogloboquadrina dutertrei at several targeted time periods over the last 50 ka to extract the total thermocline variance, a parameter supposed to reveal changes in ENSO. No fundamental changes in amplitude and frequency of the events were detected despite differences in climatic background. However, our data suggest that long-term variations in the thermocline variability occurred over the last 50 ka, with the highest and lowest ENSO activities occurring during the last glacial period and the Last Glacial Maximum, respectively. GEOGRAPHIC REGION: Eastern equatorial Pacific PERIOD OF RECORD: 52 KYrBP - present FUNDING SOURCE: CNRS LEFE-EVEMISLOLA program. DESCRIPTION: Repeated analysis of oxygen isotopes performed on thermocline- dwelling planktonic foraminifera (Neogloboquadrina dutertrei) are used to reconstruct past thermocline variability, and used a proxy for ENSO activity over the last 50 ka. Core MD02-2529: 08º12.33'N, 84º07.32'W, 1619 m water depth DATA: Column 1: Depth (cm) Column 2: Age (yr BP) Column 3: d18O Neogloboquadrina dutertrei individual (permil vs. PDB) Depth Age d18O N.duter individual (cm) (YrBP) (permil vs. PDB) Late Holocene 62 1591 -1.2138 64 1637 -1.0812 62 1591 -1.0365 62 1591 -0.9168 64 1637 -0.8920 64 1637 -0.8552 64 1637 -0.8490 62 1591 -0.8430 63 1614 -0.8340 64 1637 -0.8135 64 1637 -0.7945 62 1591 -0.7783 64 1637 -0.7767 61 1568 -0.7372 62 1591 -0.6952 62 1591 -0.6895 61 1568 -0.6578 62 1591 -0.6482 63 1614 -0.6413 61 1568 -0.6208 64 1637 -0.6143 62 1591 -0.6022 62 1591 -0.5770 64 1637 -0.5677 61 1568 -0.5540 62 1591 -0.5488 61 1568 -0.5292 61 1568 -0.4997 63 1614 -0.4770 64 1637 -0.4765 64 1637 -0.4378 61 1568 -0.4163 64 1637 -0.3983 64 1637 -0.3898 64 1637 -0.3672 62 1591 -0.3563 62 1591 -0.3438 62 1591 -0.3295 63 1614 -0.3228 64 1637 -0.3068 64 1637 -0.3038 64 1637 -0.3000 61 1568 -0.2980 63 1614 -0.2965 64 1637 -0.2920 62 1591 -0.2847 62 1591 -0.2682 64 1637 -0.2662 62 1591 -0.2655 62 1591 -0.2638 64 1637 -0.2602 61 1568 -0.2462 64 1637 -0.2443 62 1591 -0.2402 62 1591 -0.2188 64 1637 -0.1947 64 1637 -0.1635 64 1637 -0.1502 62 1591 -0.0528 64 1637 -0.0525 62 1591 -0.0253 64 1637 -0.0232 63 1614 -0.0012 61 1568 0.0112 61 1568 0.0338 62 1591 0.0367 64 1637 0.0477 62 1591 0.0513 63 1614 0.0635 63 1614 0.1575 62 1591 0.1723 62 1591 0.1735 61 1568 0.1955 62 1591 0.2217 63 1614 0.2368 64 1637 0.2400 64 1637 0.2863 64 1637 0.3398 62 1591 0.4160 64 1637 0.4327 62 1591 0.5323 Early Holocene 247 7120 -0.8732 247 7120 -0.4997 247 7120 -0.4542 243 6981 -0.4523 247 7120 -0.3557 243 6981 -0.3328 245 7050 -0.2908 247 7120 -0.2450 243 6981 -0.2443 243 6981 -0.2060 243 6981 -0.2005 245 7050 -0.1912 243 6981 -0.1793 243 6981 -0.1757 247 7120 -0.1453 247 7120 -0.1303 243 6981 -0.1273 243 6981 -0.1055 247 7120 -0.0995 243 6981 -0.0948 247 7120 -0.0892 243 6981 -0.0743 243 6981 -0.0592 245 7050 -0.0293 245 7050 -0.0200 243 6981 0.0265 243 6981 0.1015 245 7050 0.1173 247 7120 0.1252 245 7050 0.1278 243 6981 0.1422 243 6981 0.1465 243 6981 0.1473 243 6981 0.1718 247 7120 0.1833 247 7120 0.1955 243 6981 0.2142 247 7120 0.2298 247 7120 0.2460 243 6981 0.2502 243 6981 0.2573 247 7120 0.2940 247 7120 0.3000 243 6981 0.3058 243 6981 0.3172 243 6981 0.3370 243 6981 0.3610 243 6981 0.3642 243 6981 0.3948 243 6981 0.4138 247 7120 0.4148 243 6981 0.4163 243 6981 0.4250 245 7050 0.4317 243 6981 0.4403 245 7050 0.4435 243 6981 0.4503 243 6981 0.4540 243 6981 0.4732 247 7120 0.5022 243 6981 0.5825 247 7120 0.5842 243 6981 0.6222 247 7120 0.6298 243 6981 0.6317 243 6981 0.6428 247 7120 0.6585 247 7120 0.6590 247 7120 0.6885 243 6981 0.7742 243 6981 0.7812 243 6981 0.8423 Heinrich 1 469 16457 0.0448 469 16457 0.1687 469 16457 0.2457 469 16457 0.3052 469 16457 0.3177 469 16457 0.3267 469 16457 0.3827 469 16457 0.4222 469 16457 0.4292 469 16457 0.4435 469 16457 0.4543 469 16457 0.4718 469 16457 0.5178 469 16457 0.5290 469 16457 0.5323 469 16457 0.5545 469 16457 0.5633 469 16457 0.5825 469 16457 0.5855 469 16457 0.6157 469 16457 0.6445 469 16457 0.6538 469 16457 0.6623 469 16457 0.7153 469 16457 0.7200 469 16457 0.7413 469 16457 0.7943 469 16457 0.7997 469 16457 0.8165 469 16457 0.8250 469 16457 0.8360 469 16457 0.8470 469 16457 0.8700 469 16457 0.9103 469 16457 0.9113 469 16457 0.9233 469 16457 0.9425 469 16457 0.9607 469 16457 0.9812 469 16457 0.9937 469 16457 0.9952 469 16457 0.9978 469 16457 1.0080 469 16457 1.0300 469 16457 1.0455 469 16457 1.0475 469 16457 1.0480 469 16457 1.0513 469 16457 1.0585 469 16457 1.0862 469 16457 1.1227 469 16457 1.1295 469 16457 1.1483 469 16457 1.1530 469 16457 1.1552 469 16457 1.1575 469 16457 1.1713 469 16457 1.1777 469 16457 1.2018 469 16457 1.2305 469 16457 1.2727 469 16457 1.3072 469 16457 1.3082 469 16457 1.3095 469 16457 1.3973 469 16457 1.4338 469 16457 1.5688 Late LGM 519 19342 0.3087 518 19277 0.6137 518 19277 0.6362 517 19220 0.7010 518 19277 0.7145 519 19342 0.7200 518 19277 0.7387 518 19277 0.7600 518 19277 0.7600 518 19277 0.8008 519 19342 0.8082 519 19342 0.8273 517 19220 0.8442 517 19220 0.8705 518 19277 0.9185 518 19277 0.9368 517 19220 0.9697 517 19220 0.9803 518 19277 0.9885 518 19277 1.0023 519 19342 1.0298 518 19277 1.0635 518 19277 1.0638 518 19277 1.0902 518 19277 1.1088 517 19220 1.1347 517 19220 1.1383 517 19220 1.1745 518 19277 1.1765 518 19277 1.1792 517 19220 1.1972 518 19277 1.2028 518 19277 1.2082 518 19277 1.2308 518 19277 1.2483 518 19277 1.2607 517 19220 1.2747 517 19220 1.2752 517 19220 1.3017 517 19220 1.3062 518 19277 1.3067 517 19220 1.3267 517 19220 1.3417 519 19342 1.3573 518 19277 1.3592 517 19220 1.3682 518 19277 1.3727 517 19220 1.3840 518 19277 1.3842 519 19342 1.4013 518 19277 1.4085 518 19277 1.4210 518 19277 1.4425 517 19220 1.4482 517 19220 1.4508 517 19220 1.4525 518 19277 1.4670 517 19220 1.5107 517 19220 1.5157 518 19277 1.5482 519 19342 1.5638 518 19277 1.6297 519 19342 1.6343 518 19277 1.6493 519 19342 1.6540 518 19277 1.6575 518 19277 1.9303 Early LGM 587 23747 0.3637 589 23876 0.6910 585 23618 0.7117 587 23747 0.7592 581 23359 0.7928 585 23618 0.8183 589 23876 0.8368 585 23618 0.8660 589 23876 0.9220 589 23876 0.9480 589 23876 0.9635 581 23359 0.9765 581 23359 0.9780 585 23618 1.0292 585 23618 1.0665 581 23359 1.0668 581 23359 1.0697 585 23618 1.0800 589 23876 1.0950 585 23618 1.1132 581 23359 1.1148 585 23618 1.1460 581 23359 1.1745 585 23618 1.1790 581 23359 1.1923 581 23359 1.2227 585 23618 1.2382 587 23747 1.2518 581 23359 1.2918 581 23359 1.3105 581 23359 1.3985 581 23359 1.4093 581 23359 1.4220 587 23747 1.4300 585 23618 1.4372 585 23618 1.4527 587 23747 1.4670 581 23359 1.4802 581 23359 1.5085 587 23747 1.5092 581 23359 1.5167 587 23747 1.5497 581 23359 1.5525 581 23359 1.5610 581 23359 1.5620 587 23747 1.5775 587 23747 1.5797 585 23618 1.5853 581 23359 1.6090 585 23618 1.6385 585 23618 1.6407 587 23747 1.6517 587 23747 1.6627 587 23747 1.6655 587 23747 1.6693 581 23359 1.6862 585 23618 1.6915 589 23876 1.7230 581 23359 1.7242 587 23747 1.7387 585 23618 1.7400 581 23359 1.7422 587 23747 1.7445 587 23747 1.7458 585 23618 1.7662 585 23618 1.7695 585 23618 1.7835 587 23747 1.8490 587 23747 1.8953 585 23618 1.9683 DO8 795 38927 -0.2175 795 38927 -0.0635 795 38927 -0.0352 795 38927 0.0228 795 38927 0.0282 795 38927 0.0558 795 38927 0.0735 795 38927 0.1090 795 38927 0.1347 795 38927 0.1652 795 38927 0.1805 795 38927 0.1935 795 38927 0.2227 795 38927 0.2315 795 38927 0.3050 795 38927 0.3148 795 38927 0.3508 795 38927 0.3667 795 38927 0.3932 795 38927 0.4232 795 38927 0.4242 795 38927 0.4267 795 38927 0.5063 795 38927 0.5178 795 38927 0.5232 795 38927 0.5700 795 38927 0.5713 795 38927 0.5733 795 38927 0.5985 795 38927 0.6063 795 38927 0.6158 795 38927 0.6248 795 38927 0.6250 795 38927 0.6460 795 38927 0.6495 795 38927 0.6815 795 38927 0.6835 795 38927 0.6928 795 38927 0.6947 795 38927 0.6963 795 38927 0.6968 795 38927 0.6992 795 38927 0.7135 795 38927 0.7158 795 38927 0.7213 795 38927 0.7237 795 38927 0.7662 795 38927 0.7700 795 38927 0.7765 795 38927 0.7897 795 38927 0.7942 795 38927 0.8110 795 38927 0.8155 795 38927 0.8238 795 38927 0.8267 795 38927 0.8577 795 38927 0.8722 795 38927 0.8793 795 38927 0.8997 795 38927 0.9025 795 38927 0.9352 795 38927 0.9383 795 38927 0.9472 795 38927 1.0030 795 38927 1.0100 795 38927 1.0207 795 38927 1.0322 795 38927 1.0413 795 38927 1.0487 795 38927 1.0517 795 38927 1.0657 795 38927 1.0957 795 38927 1.1130 795 38927 1.1215 795 38927 1.1282 795 38927 1.1395 795 38927 1.1633 795 38927 1.2092 795 38927 1.2357 795 38927 1.2570 795 38927 1.2580 795 38927 1.2590 795 38927 1.2603 795 38927 1.3772 795 38927 1.4177 795 38927 1.4915 795 38927 1.6720 795 38927 1.7730 Heinrich 4 805 39570 -0.3212 805 39570 -0.0058 805 39570 0.0162 805 39570 0.0302 805 39570 0.0898 805 39570 0.2227 805 39570 0.2743 805 39570 0.3068 805 39570 0.3332 805 39570 0.3683 805 39570 0.4118 805 39570 0.4165 805 39570 0.4325 805 39570 0.4932 805 39570 0.4988 805 39570 0.5273 805 39570 0.5305 805 39570 0.5315 805 39570 0.5332 805 39570 0.5362 805 39570 0.5425 805 39570 0.5800 805 39570 0.6192 805 39570 0.6290 805 39570 0.6322 805 39570 0.6322 805 39570 0.6447 805 39570 0.6502 805 39570 0.6503 805 39570 0.7118 805 39570 0.7130 805 39570 0.7243 805 39570 0.7268 805 39570 0.7360 805 39570 0.7525 805 39570 0.7542 805 39570 0.7603 805 39570 0.7742 805 39570 0.7748 805 39570 0.7903 805 39570 0.8013 805 39570 0.8048 805 39570 0.8148 805 39570 0.8410 805 39570 0.8468 805 39570 0.8657 805 39570 0.8702 805 39570 0.8710 805 39570 0.8728 805 39570 0.9013 805 39570 0.9040 805 39570 0.9272 805 39570 0.9365 805 39570 0.9612 805 39570 1.0177 805 39570 1.0515 805 39570 1.1382 805 39570 1.1758 805 39570 1.1938 805 39570 1.2553 805 39570 1.2553 805 39570 1.2558 805 39570 1.2673 805 39570 1.2938 805 39570 1.2992 805 39570 1.3195 805 39570 1.3230 805 39570 1.3270 805 39570 1.3457 805 39570 1.3600 805 39570 1.4143 805 39570 1.4400 805 39570 1.5195 805 39570 1.6133 805 39570 1.6217 805 39570 1.7828 DO14 984 52144 -0.6302 984 52144 -0.5373 984 52144 -0.5050 984 52144 -0.3193 984 52144 -0.3133 984 52144 -0.2992 984 52144 -0.2842 984 52144 -0.2258 984 52144 -0.2075 984 52144 -0.1937 984 52144 -0.1857 984 52144 -0.1602 984 52144 -0.1535 984 52144 -0.0382 984 52144 -0.0372 984 52144 -0.0082 984 52144 0.0370 984 52144 0.0445 984 52144 0.0665 984 52144 0.0670 984 52144 0.0767 984 52144 0.1253 984 52144 0.1300 984 52144 0.1367 984 52144 0.1693 984 52144 0.1757 984 52144 0.1765 984 52144 0.1920 984 52144 0.2007 984 52144 0.2355 984 52144 0.2742 984 52144 0.2745 984 52144 0.2905 984 52144 0.3238 984 52144 0.3443 984 52144 0.3462 984 52144 0.3700 984 52144 0.3937 984 52144 0.3972 984 52144 0.3983 984 52144 0.4008 984 52144 0.4028 984 52144 0.4070 984 52144 0.4105 984 52144 0.4270 984 52144 0.4322 984 52144 0.4523 984 52144 0.4822 984 52144 0.4902 984 52144 0.4935 984 52144 0.5015 984 52144 0.5355 984 52144 0.5697 984 52144 0.5725 984 52144 0.5807 984 52144 0.5948 984 52144 0.6023 984 52144 0.6200 984 52144 0.6200 984 52144 0.6267 984 52144 0.6473 984 52144 0.6830 984 52144 0.6915 984 52144 0.7125 984 52144 0.7682 984 52144 0.7683 984 52144 0.8033 984 52144 0.8538 984 52144 0.8558 984 52144 0.8850 984 52144 0.9217 984 52144 0.9410 984 52144 0.9445 984 52144 0.9890 984 52144 0.9952 984 52144 1.0003 984 52144 1.0163 984 52144 1.0287 984 52144 1.0402 984 52144 1.1083 984 52144 1.1243 984 52144 1.1625 984 52144 1.1975 984 52144 1.2190 984 52144 1.2360 984 52144 1.2570 984 52144 1.2587 984 52144 1.2592 984 52144 1.3118