# Equatorial Pacific 1.1 Million Year Nitrogen Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original reference when using these data, # plus the Online Resource and date accessed. # # # Online_Resource: http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:13607 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rafter2012/rafter2012dd15n.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2012-12-11 #-------------------- # Title # Study_Name: Equatorial Pacific 1.1 Million Year Nitrogen Isotope Data #-------------------- # Investigators # Investigators: Rafter, P.A.; Charles, C.D. #-------------------- # Description_and_Notes # # Nitrogen isotope (d15N) data from Equatorial Pacific sediment cores for the past 1.1 million years # #-------------------- # Publication # Authors: Patrick A. Rafter and Christopher D. Charles # Published_Date_or_YEAR: 2012-09-18 # Published_Title: Pleistocene equatorial Pacific dynamics inferred from the zonal asymmetry in sedimentary nitrogen isotopes # Journal_Name: Paleoceanography # Volume: 27 # Issue: PA3102 # Pages: # DOI: 10.1029/2012PA002367 # Abstract: There is little agreement among models in predicting the average state of the tropical Pacific when subjected to enhanced greenhouse gas forcing. This uncertainty emphasizes the importance of reconstructing past variability in tropical Pacific climate through episodes of significant and estimable radiative forcing. Thus far, efforts along these lines have concentrated primarily on inferences of sea surface temperature variability from deep-sea sediments. Here we offer a different view of the equatorial Pacific over the past ~1.2 million years (Myr) - before and after the mid-Pleistocene shift in the structure of ice ages. The zonal gradient in the nitrogen isotopic composition of sediment across the equatorial Pacific reflects nutrient delivery to the surface and, by extension, ocean dynamical properties. Over the last ~1.2 Myr, the variability of eastern equatorial Pacific nutrient upwelling (inferred from relative nitrate utilization) was highly correlated with local seasonal insolation. By contrast, nitrate utilization was insensitive to the 100,000 year cycle that dominated many other aspects of the Pleistocene ice ages, including greenhouse gas concentrations. A strong linear relationship between relative nitrate utilization and seasonal insolation over the past ~1 million years suggests a predictable response of one primary determinant of tropical Pacific climate change. # #--------------------- # Funding_Agency # Funding_Agency_Name: Integrated Ocean Drilling Program (IODP) # Grant: Schlanger Fellowship #--------------------- # Funding_Agency_Name: Whole Earth Society # Grant: #-------------------- # Site_Information # Site_Name: Pacific E-W Dd15N (WEP Stack - EEP 849) # Location: Ocean>Pacific Ocean # Country: # Northernmost_Latitude: # Southernmost_Latitude: # Easternmost_Longitude: # Westernmost_Longitude: # Elevation: m #------------------ # Data_Collection # Core_Name: Rafter2012dd15N # First_Year: 1144000 # Last_Year: 6000 # Time_Unit: calYrBP # Core_Length: # Notes: #------------------ # Chronology # # # #------------------ # Variables # # End Description/Documentation (lines begin with #) # Data lines follow (have no #) # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: material, error, units, anomaly, period, archive, detail, method, C or N for Character or Numeric data) ## age_calkaBP Age (calendar ka BP), , ,cal kyr BP, , , , N ## dd15N Delta delta N15, , , per mil, , , , , N #----------------- # Data: # Data line format: tab-delimited text, variable short name as header # age_calkaBP dd15N 6 4.1 8 4.8 10 3.9 12 3.5 14 3.7 16 3.4 18 3.9 20 4.1 22 4.3 24 4.6 26 5 28 4.9 30 5 32 4.8 34 4.3 36 4.8 38 4.5 40 4.6 42 4.1 44 3.9 46 3.9 48 4.5 50 4.9 52 4.8 54 4.5 56 4.3 58 4.1 60 4.1 62 4 64 3.7 66 3.7 68 3.6 70 3.4 72 4.1 74 3.7 76 4.2 78 4.6 80 4.8 82 4.3 84 3.9 86 3.8 88 2.9 90 2.8 92 2.9 94 3 96 3.3 98 3.6 100 3.9 102 4.2 104 4 106 3.9 108 4.5 110 3.4 112 3 114 4.1 116 4.6 118 4 120 4.5 122 4.7 124 4.5 126 4.1 128 4.2 130 3.1 132 2.6 134 3.7 136 3.8 138 3.6 140 4.1 142 4 144 4.3 146 4.3 148 3.4 150 3.1 152 3.9 154 3.6 156 3.7 158 3.2 160 3.3 162 3.8 164 4.9 166 4 168 4.3 170 4.7 172 4.2 174 3.7 176 3.6 178 3.5 180 3.9 182 3.6 184 3.7 186 4.3 188 4.7 190 5.1 192 4.4 194 5.4 196 5.9 198 5.3 200 3.4 202 3.2 204 4.6 206 4.4 208 5 210 5.5 212 5.7 214 5.4 216 5.2 218 5.1 220 5.1 222 4.8 224 4.1 226 4.3 228 4.1 230 4 232 4.4 234 4.6 236 4.8 238 4.7 240 4.5 242 4 244 3.6 246 3.4 248 3.2 250 3.9 252 4.2 254 3.8 256 3.5 258 3.3 260 4.4 262 4.7 264 4.3 266 4.2 268 4.3 270 4 272 3.3 274 4 276 3.9 278 4.2 280 3.9 282 4.7 284 3.7 286 3.6 288 2.8 290 2.4 292 2.4 294 3.1 296 3.5 298 3.8 300 3.5 302 3.7 304 3.4 306 3.4 308 4.4 310 5.1 312 4.5 314 3.9 316 2.9 318 3.2 320 4 322 4.5 324 4.7 326 5.5 328 5.7 330 4.7 332 4.1 334 4.1 336 4.3 338 4.1 340 2.4 342 3 344 3.7 346 4.2 348 3.9 350 4.8 352 4.3 354 3.9 356 3.8 358 3.6 360 3.7 362 3 364 3.2 366 3.4 368 3.2 370 3.3 372 3.4 374 3.2 376 2.7 378 2.8 380 3.7 382 3.7 384 3.6 386 4.4 388 3.8 390 2.9 392 3.4 394 4.2 396 3.8 398 4 400 3.6 402 3.8 404 4.9 406 5 408 4 410 3.8 412 3.4 414 3.5 416 4 418 3.9 420 4 422 4.2 424 4.4 426 4.1 428 3.2 430 3.2 432 3.1 434 2.6 436 2.7 438 3.1 440 4 442 4.6 444 3.9 446 3.6 448 3.7 450 3.2 452 2.9 454 3.5 456 4.1 458 4.4 460 5.2 462 3.6 464 2.6 466 2.8 468 3 470 2.5 472 3 474 3.4 476 4 478 4 480 3.7 482 2.8 484 2.4 486 2.4 488 2.8 490 3.1 492 3.9 494 3 496 3.5 498 4 500 4.2 502 4.5 504 4 506 3.7 508 3.7 510 3.6 512 4.5 514 3.6 516 4.1 518 4.5 520 3.4 522 3.8 524 4.7 526 3.7 528 3 530 3.5 532 3.3 534 2.5 536 3.2 538 3.6 540 3.6 542 3.4 544 4.1 546 4.7 548 4.1 550 3.6 552 3.9 554 3.7 556 3.8 558 2.5 560 2.7 562 2.5 564 3 566 3.5 568 3.8 570 4.2 572 4 574 2.5 576 2.2 578 2.8 580 3.3 582 4 584 3.6 586 3.5 588 3.3 590 4.4 592 4.4 594 4.4 596 3.9 598 2 600 2.1 602 1.5 604 1.8 606 2.7 608 3 610 3.3 612 2.8 614 3.2 616 4 618 3.7 620 3.3 622 3.8 624 3.3 626 2.5 628 3.2 630 3.5 632 3.4 634 3.8 636 3.7 638 3.7 640 3.5 642 3.4 644 3.3 646 4 648 4.5 650 4 652 3 654 2.8 656 2.3 658 2.2 660 3 662 3.2 664 3.6 666 4.2 668 4.2 670 4.2 672 3.6 674 2.8 676 3 678 3.1 680 2.8 682 4.3 684 3.6 686 4.1 688 4 690 3.6 692 4.1 694 3.9 696 3 698 2.9 700 3.8 702 5.2 704 4.6 706 5.1 708 5.2 710 5 712 4.6 714 4.2 716 3.6 718 4.6 720 4 722 4 724 4.7 726 3.7 728 3.4 730 3.9 732 4.9 734 4.7 736 4.9 738 4.1 740 2.6 742 3.8 744 3.9 746 4.1 748 4.1 750 4 752 3.7 754 3.1 756 2.9 758 3 760 3.1 762 4.1 764 4.3 766 3.6 768 3.4 770 3.7 772 4.1 774 3.2 776 3.1 778 3.7 780 3.9 782 4.2 784 4.4 786 3.8 788 2.9 790 2.7 792 3.3 794 3.3 796 3.3 798 3.8 800 4.2 802 3.9 804 3.5 806 3 808 2.5 810 2.3 812 3 814 2.9 816 2.7 818 2.8 820 2.4 822 2.3 824 2.3 826 2.4 828 2.5 830 2.7 832 3 834 3.2 836 3.3 838 2.7 840 2.9 842 3.4 844 3 846 2.9 848 2.9 850 2.1 852 2.7 854 2.5 856 3.5 858 4.2 860 3.6 862 2.2 864 2.8 866 3.3 868 3.6 870 2.7 872 2.6 874 3.2 876 3.1 878 3.1 880 3.3 882 3.4 884 2.7 886 2.8 888 3.2 890 3.4 892 3.3 894 3 896 3.2 898 3.7 900 3.5 902 2.9 904 2.4 906 2.1 908 2.6 910 4.1 912 2.8 914 2.1 916 2.8 918 3.2 920 2.7 922 2.5 924 2.7 926 4.1 928 4.9 930 3.9 932 3.4 934 2.7 936 3.1 938 3.2 940 2.8 942 3.3 944 3.4 946 2.9 948 2.5 950 3.8 952 3.8 954 3.2 956 2.4 958 2.6 960 3.6 962 3.1 964 2.7 966 2 968 1.6 970 1.9 972 2.4 974 2.6 976 2 978 2.1 980 2.5 982 2.9 984 2.9 986 2.9 988 3.5 990 3.5 992 4.4 994 4.5 996 2.9 998 3 1000 3.2 1002 2.6 1004 2.8 1006 3.2 1008 3.2 1010 2.6 1012 2.1 1014 2.5 1016 2.7 1018 3.1 1020 3.5 1022 4.4 1024 4 1026 3.2 1028 2.6 1030 3.5 1032 3.5 1034 3.1 1036 3.6 1038 3.8 1040 3.5 1042 3.5 1044 3.9 1046 4.2 1048 4.5 1050 4.2 1052 3.8 1054 3.2 1056 2.5 1058 2 1060 2.2 1062 2.4 1064 2.8 1066 4.7 1068 3.5 1070 3.3 1072 2.9 1074 3.5 1076 2.7 1078 2.3 1080 3 1082 3.1 1084 3.9 1086 3.3 1088 3.6 1090 4.3 1092 3.7 1094 3.1 1096 3.1 1098 2.9 1100 2.6 1102 2.2 1104 2.5 1106 2.9 1108 3.8 1110 3.9 1112 2.9 1114 3.4 1116 2.1 1118 2.1 1120 4.1 1122 4.5 1124 4.2 1126 3.1 1128 3 1130 3.3 1132 3.6 1134 3.7 1136 4.8 1138 4.6 1140 3.8 1142 4 1144 3.3