Cariaco Basin Foraminiferal Mg/Ca and SST Reconstruction --------------------------------------------------------------------- NOAA Paleoclimatology Program and World Data Center for Paleoclimatology, Boulder --------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Cariaco Basin Foraminiferal Mg/Ca and SST Reconstruction LAST UPDATE: 10/2003 (Original Receipt by WDC Paleo) CONTRIBUTOR: David Lea, University of California, Santa Barbara IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2003-067 SUGGESTED DATA CITATION: Lea, D.W., et al., 2003, Cariaco Basin Foraminiferal Mg/Ca and SST Reconstruction, IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2003-067. NOAA/NGDC Paleoclimatology Program, Boulder, CO, USA. ORIGINAL REFERENCE: Lea, D.W., D.K. Pak, L.C. Peterson, and K.A. Hughen, 2003, Synchroneity of Tropical and High-Latitude Atlantic Temperatures over the Last Glacial Termination, Science, Volume 301, Number 5638, pp.1361-1364, 5 September 2003. ABSTRACT: A high-resolution western tropical Atlantic sea surface temperature (SST) record from the Cariaco Basin on the northern Venezuelan shelf, based on Mg/Ca values in surface-dwelling planktonic foraminifera, reveals that changes in SST over the last glacial termination are synchronous, within ±30 to ±90 years, with the Greenland Ice Sheet Project 2 air temperature proxy record and atmospheric methane record. The most prominent deglacial event in the Cariaco record occurred during the Younger Dryas time interval, when SSTs dropped by 3° to 4°C. A rapid southward shift in the atmospheric intertropical convergence zone could account for the synchroneity of tropical temperature, atmospheric methane, and high-latitude changes during the Younger Dryas. GEOGRAPHIC REGION: Western Tropical Atlantic PERIOD OF RECORD: 25 KYrBP - present FUNDING SOURCE: National Science Foundation (USA) DESCRIPTION: Climate proxy data from Cariaco Basin core PL07-39PC (10°42.00'N, 64°56.50'W, 790 m). The Mg/Ca record is from planktonic foraminifera G. ruber, white variety, with the pink variety analyzed when sample abundances were limited. Each point is the average of one to five replicates; the pooled SD of all replicate analyses (df = 155) was ±0.16 mmom/mol (±4%). The gap between 165 and 192 cm is due to a turbidite. Core PL07-39PC has nearly continuous laminations from 0 to 630 cm; the transition to bioturbated sediments occurs at the Bølling transition. Core site is northern flank of the saddle separating the two sub-basins of the Cariaco Basin, collected in June 1990 on the R/V Thomas Washington. Core is 993 cm long, archived at LDEO. There is a turbidite between 170-190 cm core depth. Conversion of core depth to age is based on calibrated radiocarbon ages (Calib v. 4.4) and sediment greyscale wiggle matching using the Hughen Cariaco varve chronology. Described in detail in the Supplementary Online Material associated with the primary reference. DATA: core depth (cm, uncorrected) age, calendar years before 1950 A.D. Mg/Ca (mmol/mol) analytical precision, ±0.7%; sample reproducibility, ±4% SST (deg C) - calculated from SST = ln(Mg/Ca/0.38)/0.09 (Dekens et al., 2002; Anand et al., 2003) Estimated error in SST, ±0.7 deg C Depth cm Age yr Mg/Ca SST C 0 305 4.267 26.9 6.5 465 4.108 26.5 10 551 4.109 26.5 16.5 711 4.301 27 20 797 4.22 26.7 26 945 4.244 26.8 30 1037 4.29 26.9 36.5 1187 4.145 26.5 40 1268 4.131 26.5 45 1383 4.204 26.7 50 1528 4.259 26.9 55 1673 4.273 26.9 60 1818 4.487 27.4 65 1963 4.383 27.2 70 2108 3.966 26.1 75 2257 4.237 26.8 80 2451 4.085 26.4 85 2644 4.218 26.7 90 2837 4.17 26.6 95 3030 4.279 26.9 100 3223 4.334 27 105 3446 4.081 26.4 110 3787 3.966 26.1 115 4127 4.031 26.2 120 4468 4.066 26.3 125 4635 4.24 26.8 130 4801 4.071 26.3 135 4968 4.313 27 140 5135 4.108 26.4 145 5321 3.959 26 150 5587 4.109 26.5 154 5800 4.043 26.3 160 6119 3.927 25.9 165 6385 4.261 26.9 195 6868 4.362 27.1 200 7109 4.431 27.3 205 7350 4.437 27.3 210 7592 4.076 26.4 215 7838 4.615 27.7 220 8126 4.372 27.1 225 8432 4.361 27.1 230 8720 4.236 26.8 235 8909 4.197 26.7 240 9101 4.309 27 245 9294 4.029 26.2 256 9684 4.414 27.2 260 9805 4.591 27.7 265 9956 4.579 27.7 270 10057 4.222 26.8 275 10141 4.184 26.7 280 10226 4.111 26.5 285 10311 4.219 26.7 290 10396 4.011 26.2 297 10537 4.363 27.1 300 10610 4.103 26.4 305 10731 4.45 27.3 312 10897 4.201 26.7 316 10991 4.327 27 320 11085 3.867 25.8 325 11202 3.877 25.8 330 11320 4.444 27.3 336 11391 4.638 27.8 340 11424 3.903 25.9 345 11466 4.022 26.2 350 11508 3.666 25.2 355 11550 3.875 25.8 360 11613 3.393 24.3 365 11679 3.477 24.6 370 11745 3.305 24 375 11801 3.615 25 380 11841 3.219 23.7 385 11881 3.181 23.6 390 11921 3.49 24.6 395 11961 3.306 24 400 12001 3.376 24.3 406 12049 3.608 25 410 12081 3.121 23.4 415 12121 3.537 24.8 420 12161 3.317 24.1 425 12201 3.339 24.1 430 12241 3.502 24.7 435 12281 3.409 24.4 445 12361 3.002 23 450 12401 3.002 23 455 12441 3.139 23.5 460 12481 2.868 22.5 466.5 12533 3.327 24.1 470 12561 3.252 23.9 475 12600 3.145 23.5 480 12640 2.961 22.8 485 12680 3.099 23.3 490 12720 3.141 23.5 495 12760 3.266 23.9 500 12800 3.331 24.1 505 12848 4.077 26.4 510 12900 3.95 26 515 12953 4.46 27.4 525 13063 4.406 27.2 530 13120 3.935 26 535 13176 4.887 28.4 540 13233 3.955 26 545 13290 4.572 27.6 550 13347 4.343 27.1 560 13712 4.576 27.6 565 13786 4.47 27.4 570 13860 4.419 27.3 580 13992 3.559 24.9 585 14035 4.528 27.5 590 14077 3.925 25.9 595 14120 4.537 27.6 600 14166 4.126 26.5 605 14263 4.604 27.7 610 14361 4.234 26.8 615 14458 4.55 27.6 620 14555 4.221 26.8 630 14740 3.578 24.9 640 14894 3.432 24.5 645 14971 3.396 24.3 650 15048 3.422 24.4 655 15125 3.437 24.5 660 15202 3.779 25.5 665 15279 3.307 24 670 15356 3.348 24.2 675 15433 3.443 24.5 680 15510 3.386 24.3 685 15587 3.276 23.9 690 15664 3.424 24.4 695 15741 3.432 24.5 700 15818 3.494 24.7 705 15895 3.797 25.6 710 15972 3.594 25 715 16049 3.545 24.8 720 16126 3.434 24.5 730 16307 3.767 25.5 735 16404 3.53 24.8 740 16502 3.989 26.1 745 16600 3.721 25.3 750 16697 3.683 25.2 755.5 16805 3.449 24.5 760 16893 3.406 24.4 765 16990 3.543 24.8 770 17088 3.391 24.3 775.5 17215 3.524 24.7 780 17326 3.56 24.9 786 17473 3.576 24.9 790 17572 3.559 24.9 798 17768 3.53 24.8 800 17817 3.268 23.9 805 17940 3.411 24.4 810 18063 3.59 25 815.5 18198 3.447 24.5 820 18309 3.445 24.5 825 18432 3.292 24 830 18555 3.593 25 835 18678 3.406 24.4 840 18800 3.553 24.8 845 18923 3.416 24.4 850 19046 3.523 24.7 855 19169 3.411 24.4 860 19292 3.315 24.1 865 19415 3.258 23.9 870 19538 3.624 25.1 875 19661 3.268 23.9 880 19783 3.332 24.1 885 19906 3.101 23.3 890 20029 3.146 23.5 895 20152 3.223 23.8 900 20275 3.387 24.3 905 20437 3.152 23.5 910 20692 3.377 24.3 915 20946 3.106 23.3 920 21201 3.424 24.4 925 21455 3.23 23.8 930 21710 3.158 23.5 935 21964 3.37 24.3 940 22219 3.086 23.3 945 22473 3.166 23.6 950 22728 3.277 23.9 955 22982 3.112 23.4 960 23237 3.114 23.4 965 23491 3.315 24.1 970 23746 3.143 23.5 985.5 24535 3.369 24.2 990 24764 3.669 25.2