Southern Ocean Sediment Trap Planktonic Foraminiferal d18O Data --------------------------------------------------------------------- NOAA Paleoclimatology Program and World Data Center for Paleoclimatology, Boulder --------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Southern Ocean Sediment Trap Planktonic Foraminiferal d18O Data LAST UPDATE: 7/2005 (Original Receipt by WDC Paleo) CONTRIBUTOR: Alix Post (King), Geoscience Australia, Canberra. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2005-050 SUGGESTED DATA CITATION: King, A.L. and W.R. Howard. 2005. Southern Ocean Sediment Trap Planktonic Foraminiferal d18O Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2005-050. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: King, A.L. and Howard, W.R. 2005. d18O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions. Marine Micropaleontology. 56:1-24. ABSTRACT: The oxygen isotopic record obtained from Globigerina bulloides, Globorotalia inflata and Neogloboquadrina pachyderma (s.) was analysed for 5 sediment traps moored in the Southern Ocean and Southwest Pacific. The traps extend from Subtropical to the Polar Frontal environments, providing the first analysis of seasonal foraminiferal d18O records from these latitudes. Comparison between the foraminiferal records and various equations for predicted d18O of calcite reveals that the predicted d18O is best captured by the equations of Epstein et al. (1953) and Kim and O’Neil (1997). The Epstein equation shows a constant offset from the d18O of G. bulloides and N. pachyderma (s.) across the full range of latitudes. The seasonal range in d18O values for these two species implies a near-surface habitat across all sites, while G. inflata most likely dwells at ~50m depth. A significant finding in this study was that offsets from predicted d18O for G. bulloides do not correlate to changes in the carbonate ion concentration. This suggests that [CO32-] in and of itself may not capture the full range of carbonate chemistry conditions in the marine system. This sediment trap deployment also reveals distinct seasonal flux patterns for each species. Comparison between flux-weighted isotopic values calculated from the sediment traps and the isotopic composition of nearby surface sediments indicates that the sedimentary records retain this seasonal imprint. At the 51°S site, G. bulloides has a spring flux peak while N. pachyderma (s.) is dominated by summer production. The imprint of these differing seasonal production patterns on the flux-weighted d18O values results in more depleted d18O for N. pachyderma (s.) than for G. bulloides. Interpretations of N. pachyderma (s.) isotopic composition as a record of subsurface conditions may therefore need to be refined, with implications for interpretation of depleted glacial d13C for this species (Sigman and Boyle, 2000). GEOGRAPHIC REGION: Southern Ocean PERIOD OF RECORD: Modern DESCRIPTION: This dataset includes d18O values measured from Globigerina bulloides, Neogloboquadrina pachyderma (s.) and Globorotalia inflata from moored sediment traps at: NCR: 42°42’S;178°38’E SCR: 44°37’S; 178°37’E SAZ: 46°45.6’S; 142°4.2’E SAF: 51°0.01’S; 141°44.3’E PFZ: 53°44.8’S; 141°45.5’E Ten specimens in the 250-355 µm size fraction were analysed per sample for G. bulloides and G. inflata, and 15-20 specimens in the 150-250 µm size fraction were analysed for N. pachyderma (s.). The Chatham Rise (NCR and SCR) samples were analysed at the Central Sciences Laboratory, University of Tasmania on an individual reaction-vial automated carbonate line coupled to a Micromass Optima mass spectrometer. Analytical precision was ±0.08 for d13C and ±0.09 for d18O (N = 51). The other samples (SAZ, SAF and PFZ) were analysed on a Micromass Optima at UC Davis. The average analytical precision for these measurements was ±0.05 for d13C, and ±0.06 for d18O (N = 28). The isotopic ratios are reported as per mil (‰) deviations from the Pee Dee belemnite (PDB) standard using Carrara marble as a laboratory standard. The King and Howard (2004) d13C data is available at: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/king2004/ Data: Column 1: Trap Site ID Column 2: Trap Depth Column 3: Trap Open Date Column 4: Trap Close Date Column 4: G. bulloides d18O per mil PDB Column 4: G. inflata d18O per mil PDB Column 4: N. pachyderma (s.) d18O per mil PDB G.bull. G.infl. N.pachy. Trap site Trap depth Cup Trap opened Trap closed d18O d18O d18O NCR 42 1000 1 14-Sep-96 22-Sep-96 0.9125 1.3674 NA NCR 42 1000 2 22-Sep-96 30-Sep-96 0.702 1.2152 NA NCR 42 1000 3 30-Sep-96 8-Oct-96 0.7862 1.1725 NA NCR 42 1000 4 8-Oct-96 17-Oct-96 0.7335 1.2443 NA NCR 42 1000 5 17-Oct-96 25-Oct-96 0.6962 1.2871 NA NCR 42 1000 6 25-Oct-96 2-Nov-96 0.6736 1.2226 NA NCR 42 1000 7 2-Nov-96 10-Nov-96 0.578 1.203 NA NCR 42 1000 8 10-Nov-96 18-Nov-96 0.4878 1.0042 NA NCR 42 1000 9 18-Nov-96 26-Nov-96 -0.6167 0.9989 NA NCR 42 1000 10 26-Nov-96 4-Dec-96 0.4074 0.999 NA NCR 42 1000 11 4-Dec-96 12-Dec-96 0.5637 1.2817 NA NCR 42 1000 12 12-Dec-96 20-Dec-96 0.3016 0.9289 NA NCR 42 1000 13 20-Dec-96 5-Jan-97 0.1857 0.7965 NA NCR 42 1000 14 5-Jan-97 21-Jan-97 0.303 0.8059 NA NCR 42 1000 15 21-Jan-97 7-Feb-97 -0.2615 0.8156 NA NCR 42 1000 16 7-Feb-97 23-Feb-97 0.0286 0.8759 NA NCR 42 1000 17 23-Feb-97 11-Mar-97 NA 0.4054 NA NCR 42 1000 18 11-Mar-97 27-Mar-97 -0.1548 0.431 NA NCR 42 1000 19 27-Mar-97 13-Apr-97 -0.0978 0.7559 NA NCR 42 1000 20 13-Apr-97 29-Apr-97 -0.1698 0.4667 NA NCR 42 1000 21 29-Apr-97 15-May-97 0.152 0.858 NA SCR 44 1000 1 9-Jun-96 25-Jun-96 1.406 1.137 NA SCR 44 1000 2 25-Jun-96 11-Jul-96 1.21 NA NA SCR 44 1000 3 11-Jul-96 28-Jul-96 0.962 1.42 NA SCR 44 1000 4 28-Jul-96 13-Aug-96 1.216 1.471 NA SCR 44 1000 5 13-Aug-96 29-Aug-96 1.46 1.546 NA SCR 44 1000 6 29-Aug-96 14-Sep-96 1.7845 1.4818 NA SCR 44 1000 7 14-Sep-96 22-Sep-96 1.8498 2.069 1.262 SCR 44 1000 8 30-Sep-96 8-Oct-96 1.8728 2.1418 1.332 SCR 44 1000 9 17-Oct-96 25-Oct-96 1.8639 2.0978 0.346 SCR 44 1000 10 2-Nov-96 10-Nov-96 1.8053 2.0451 1.588 SCR 44 1000 11 18-Nov-96 26-Nov-96 1.3335 2.037 1.115 SCR 44 1000 12 4-Dec-96 12-Dec-96 1.062 1.492 NA SCR 44 1000 13 20-Dec-96 5-Jan-97 1.27 1.321 NA SCR 44 1000 14 5-Jan-97 21-Jan-97 0.925 1.288 NA SCR 44 1000 15 21-Jan-97 7-Feb-97 0.776 1.337 NA SCR 44 1000 16 7-Feb-97 23-Feb-97 0.453 1.473 0.512 SCR 44 1000 17 23-Feb-97 11-Mar-97 0.27 1.357 0.3857 SCR 44 1000 18 11-Mar-97 27-Mar-97 0.267 1.417 0.4047 SCR 44 1000 19 27-Mar-97 13-Apr-97 0.206 1.466 0.1327 SCR 44 1000 20 13-Apr-97 29-Apr-97 0.129 1.453 0.5357 SCR 44 1000 21 29-Apr-97 15-May-97 NA NA NA SAZ 47 3850 1 21-Sep-97 30-Sep-97 1.451 NA NA SAZ 47 3850 2 30-Sep-97 8-Oct-97 1.5 1.441 NA SAZ 47 3850 3 8-Oct-97 17-Oct-97 1.359 1.714 NA SAZ 47 3850 4 17-Oct-97 25-Oct-97 1.267 1.809 NA SAZ 47 3850 5 25-Oct-97 3-Nov-97 1.391 1.542 NA SAZ 47 3850 6 3-Nov-97 11-Nov-97 1.212 1.382 NA SAZ 47 3850 7 11-Nov-97 20-Nov-97 1.056 1.365 NA SAZ 47 3850 8 20-Nov-97 28-Nov-97 0.955 NA NA SAZ 47 3850 9 28-Nov-97 7-Dec-97 1.005 1.107 NA SAZ 47 3850 10 7-Dec-97 15-Dec-97 0.861 1.132 NA SAZ 47 3850 11 15-Dec-97 24-Dec-97 0.75 1.081 NA SAZ 47 3850 12 24-Dec-97 1-Jan-98 1.127 1.114 0.57 SAZ 47 3850 13 1-Jan-98 6-Jan-98 0.857 1.247 0.26 SAZ 47 3850 14 6-Jan-98 10-Jan-98 0.88 1.068 0.853 SAZ 47 3850 15 10-Jan-98 14-Jan-98 0.952 -0.252 0.857 SAZ 47 3850 16 14-Jan-98 18-Jan-98 0.906 0.909 0.779 SAZ 47 3850 17 18-Jan-98 23-Jan-98 0.943 1.198 0.81 SAZ 47 3850 18 23-Jan-98 27-Jan-98 0.84 1.242 0.678 SAZ 47 3850 19 27-Jan-98 4-Feb-98 0.787 1.222 0.4499 SAZ 47 3850 20 4-Feb-98 13-Feb-98 0.717 1.054 0.592 SAZ 47 3850 21 13-Feb-98 21-Feb-98 NA NA NA SAZ 47 1998 3850 1 15-Mar-98 9-Apr-98 0.81 1.143 0.348 SAZ 47 1998 3850 2 9-Apr-98 24-Apr-98 0.604 0.878 NA SAZ 47 1998 3850 3 24-Apr-98 10-May-98 0.821 1.198 0.59 SAZ 47 1998 3850 4 10-May-98 25-May-98 0.827 1.262 0.42 SAZ 47 1998 3850 5 25-May-98 10-Jun-98 0.843 1.264 NA SAZ 47 1998 3850 6 10-Jun-98 25-Jun-98 0.984 1.221 NA SAZ 47 1998 3850 7 25-Jun-98 11-Jul-98 0.821 1.102 NA SAZ 47 1998 3850 8 11-Jul-98 26-Jul-98 0.936 1.383 NA SAZ 47 1998 3850 9 26-Jul-98 11-Aug-98 1.48 NA SAZ 47 1998 3850 10 11-Aug-98 26-Aug-98 1.02 1.094 NA SAZ 47 1998 3850 11 26-Aug-98 11-Sep-98 1.108 1.263 NA SAZ 47 1998 3850 12 11-Sep-98 26-Sep-98 1.41 1.396 NA SAZ 47 1998 3850 13 26-Sep-98 12-Oct-98 1.4104 1.573 NA SAZ 47 1998 3850 14 12-Oct-98 27-Oct-98 1.286 1.622 NA SAZ 47 1998 3850 15 27-Oct-98 12-Nov-98 1.45 1.672 NA SAZ 47 1998 3850 16 12-Nov-98 27-Nov-98 1.3 1.251 NA SAZ 47 1998 3850 17 27-Nov-98 13-Dec-98 1.2 1.412 NA SAZ 47 1998 3850 18 13-Dec-98 28-Dec-98 2.08 NA NA SAZ 47 1998 3850 19 28-Dec-98 13-Jan-99 NA NA NA SAZ 47 1998 3850 20 13-Jan-99 28-Jan-99 0.891 0.846 NA SAZ 47 1998 3850 21 28-Jan-99 13-Feb-99 NA NA NA SAF 51 3080 1 21-Sep-97 30-Sep-97 1.911 2.226 NA SAF 51 3080 2 30-Sep-97 8-Oct-97 1.852 2.193 NA SAF 51 3080 3 8-Oct-97 17-Oct-97 1.911 2.286 NA SAF 51 3080 4 17-Oct-97 25-Oct-97 1.926 2.386 1.907 SAF 51 3080 5 25-Oct-97 3-Nov-97 1.941 2.336 1.941 SAF 51 3080 6 3-Nov-97 11-Nov-97 1.956 2.225 1.89 SAF 51 3080 7 11-Nov-97 20-Nov-97 2.091 2.299 1.81 SAF 51 3080 8 20-Nov-97 28-Nov-97 2.239 2.442 1.7 SAF 51 3080 9 28-Nov-97 7-Dec-97 2.084 2.536 1.837 SAF 51 3080 10 7-Dec-97 15-Dec-97 2.238 2.171 1.61 SAF 51 3080 11 15-Dec-97 24-Dec-97 2.262 2.393 1.797 SAF 51 3080 12 24-Dec-97 1-Jan-98 2.069 2.284 1.906 SAF 51 3080 13 1-Jan-98 6-Jan-98 1.949 NA 2 SAF 51 3080 14 6-Jan-98 10-Jan-98 1.49 NA 1.63 SAF 51 3080 15 10-Jan-98 14-Jan-98 1.592 NA 1.96 SAF 51 3080 16 14-Jan-98 18-Jan-98 1.572 NA 1.844 SAF 51 3080 17 18-Jan-98 23-Jan-98 1.871 NA 1.789 SAF 51 3080 18 23-Jan-98 27-Jan-98 1.579 NA 1.52 SAF 51 3080 19 27-Jan-98 4-Feb-98 1.622 NA 1.531 SAF 51 3080 20 4-Feb-98 13-Feb-98 1.447 NA 1.33 SAF 51 3080 21 13-Feb-98 21-Feb-98 1.651 NA 1.428 PFZ 54 830 1 21-Sep-97 30-Sep-97 NA NA NA PFZ 54 830 2 30-Sep-97 8-Oct-97 NA NA NA PFZ 54 830 3 8-Oct-97 17-Oct-97 NA NA NA PFZ 54 830 4 17-Oct-97 25-Oct-97 NA NA 2.2 PFZ 54 830 5 25-Oct-97 3-Nov-97 NA NA 2.433 PFZ 54 830 6 3-Nov-97 11-Nov-97 NA NA 2.751 PFZ 54 830 7 11-Nov-97 20-Nov-97 NA NA 2.386 PFZ 54 830 8 20-Nov-97 28-Nov-97 2.79 NA 2.683 PFZ 54 830 9 28-Nov-97 7-Dec-97 2.8 NA 2.482 PFZ 54 830 10 7-Dec-97 15-Dec-97 2.81 NA 2.408 PFZ 54 830 11 15-Dec-97 24-Dec-97 2.83 NA 2.573 PFZ 54 830 12 24-Dec-97 1-Jan-98 2.72 NA 2.41 PFZ 54 830 13 1-Jan-98 6-Jan-98 2.45 NA 2.298 PFZ 54 830 14 6-Jan-98 10-Jan-98 2.53 NA 2.424 PFZ 54 830 15 10-Jan-98 14-Jan-98 2.5789 NA 2.31 PFZ 54 830 16 14-Jan-98 18-Jan-98 2.61 NA 2.252 PFZ 54 830 17 18-Jan-98 23-Jan-98 2.449 NA 2.214 PFZ 54 830 18 23-Jan-98 27-Jan-98 2.6513 NA 2.231 PFZ 54 830 19 27-Jan-98 4-Feb-98 2.24 NA 3.429 PFZ 54 830 20 4-Feb-98 13-Feb-98 2.55 NA 2.454 PFZ 54 830 21 13-Feb-98 21-Feb-98 2.26 NA 2.215 PFZ 54 830 22 24-Mar-98 9-Apr-98 2.13 NA 2.151