# Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24790 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc15_27.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: oxygen isotopes, carbon isotopes #--------------------------------------- # Contribution_Date # Date: 2018-07-30 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-07-30 #--------------------------------------- # Title # Study_Name: Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas #--------------------------------------- # Investigators # Investigators: Keigwin, Lloyd D.; Klotsko, Shannon; Zhao, Ning; Reilly, Brendan; Giosan, L.; Driscoll, Neal W. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: North Atlantic Oscillation, radiocarbon dating, foraminifera, oxygen isotopes #--------------------------------------- # Publication # Authors: Keigwin, L.D., S. Klotsko, N. Zhao, B. Reilly, L. Giosan, and N.W. Driscoll # Published_Date_or_Year: 2018 # Published_Title: Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling # Journal_Name: Nature Geoscience # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1038/s41561-018-0169-6 # Online_Resource: # Full_Citation: # Abstract: A period of cooling about 13,000 years ago interrupted about 2,000 years of deglacial warming. Known as the Younger Dryas (YD), the event is thought to have resulted from a slowdown of the Atlantic meridional overturning circulation in response to a sudden flood of Laurentide Ice Sheet meltwater that reached the Nordic Seas. Oxygen isotope evidence for a local source of meltwater to the open western North Atlantic from the Gulf of St Lawrence has been lacking. Here we report that the eastern Beaufort Sea contains the long-sought signal of 18O-depleted water. Beginning at ~12.94 ± 0.15 thousand years ago, oxygen isotopes in the planktonic foraminifera from two sediment cores as well as sediment and seismic data indicate a flood of meltwater, ice and sediment to the Arctic via the Mackenzie River that lasted about 700 years. The minimum in the oxygen isotope ratios lasted ~130 years. We suggest that the floodwater travelled north along the Canadian Archipelago and then through the Fram Strait to the Nordic Seas, where freshening and freezing near sites of deep-water formation would have suppressed convection and caused the YD cooling by reducing the meridional overturning. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: ARC1204045 #--------------------------------------- # Site_Information # Site_Name: HLY1302 JPC15/27 # Location: Beaufort Sea # Country: # Northernmost_Latitude: 71.106 # Southernmost_Latitude: 71.1037 # Easternmost_Longitude: -135.135483 # Westernmost_Longitude: -135.160667 # Elevation: #--------------------------------------- # Data_Collection # Collection_Name: JPC15/JPC27 splice Keigwin2018 # First_Year: # Last_Year: # Time_Unit: # Core_Length: 16.69 # Notes: Locations for spliced core: JPC15 71.1037 N, 135.135483 W, -687.3 m; JPC27 71.106 N, 135.160667 W, -693 m. Composite core length 16.69 m #--------------------------------------- # Chronology_Information # Chronology: # Table for Core HLY1302 JPC-15 # labcode (NOSAMS) depth_top depth_bottom mat.dated Conv. 14C uncertainty datemeth reservoir delta-R delta-R_err_lo calib.14C_1s calib_method notes # 110669 46 54 Nps 5300 30 14C AMS Marine 13 0 100 5672 Calib 7.1 # 110857 163 171 Nps 8340 40 14C AMS Marine 13 0 100 8894 Calib 7.1 # 110670 271 277 Nps 9830 55 14C AMS Marine 13 0 100 10773 Calib 7.1 # 110671 348 352 Nps 10200 45 14C AMS Marine 13 0 100 11209 Calib 7.1 # 134017 428 432 Nps 10800 35 14C AMS Marine 13 200 100 12262 Calib 7.1 # 110672 448 452 Nps 11050 45 14C AMS Marine 13 200 100 12351 Calib 7.1 # 131596 478 482 Nps 11100 30 14C AMS Marine 13 200 100 12415 Calib 7.1 # 123914 498 502 Nps 11300 35 14C AMS Marine 13 200 100 12621 Calib 7.1 # 131597 518 522 Nps 11750 35 14C AMS Marine 13 0 100 13226 Calib 7.1 # 110673 598 602 Nps 12250 60 14C AMS Marine 13 0 100 13707 Calib 7.1 # 110674 846 854 Nps 12250 55 14C AMS Marine 13 0 100 13707 Calib 7.1 # 110675 1198 1204 Nps 12600 60 14C AMS Marine 13 0 100 14124 Calib 7.1 # 110676 1298 1302 Nps 12800 65 14C AMS Marine 13 0 100 14508 Calib 7.1 # 106829 1345 * Nps+MBF 13100 50 14C AMS Marine 13 NaN NaN NaN NaN *this was a core catcher sample so its position in the core may be off by a few cm # 113087 46 54 C. neoteretis 5020 20 14C AMS Marine 13 NaN NaN NaN NaN MBF= mixed benthic foraminifera # 113088 271 277 C. neoteretis 10100 30 14C AMS Marine 13 NaN NaN NaN NaN NaN # 113089 348 352 C. neoteretis 10200 30 14C AMS Marine 13 NaN NaN NaN NaN NaN # 113090 448 452 C. neoteretis 11200 30 14C AMS Marine 13 NaN NaN NaN NaN NaN # 113091 1198 1204 C. neoteretis 13000 35 14C AMS Marine 13 NaN NaN NaN NaN NaN # 113092 1298 1302 C. neoteretis 13000 35 14C AMS Marine 13 NaN NaN NaN NaN NaN # HLY1302 JPC-02 NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN # 122350 920 923 MBF 13500 70 14C AMS Marine 13 NaN NaN 15546 Calib 7.1 NaN # HLY1302 JPC-06 NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN # 122351 1034 1038 MBF 11250 65 14C AMS Marine 13 NaN NaN 12660 Calib 7.1 NaN # HLY1302 JPC-09 NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN # 134142 1188 1192 Nps 11000 30 14C AMS Marine 13 NaN NaN 12392 Calib 7.1 NaN # 127490 1312 1314 Nps 11350 45 14C AMS Marine 13 NaN NaN 12740 Calib 7.1 NaN # 127496 1312 1334 MBF 11650 45 14C AMS NaN NaN NaN NaN NaN NaN # 131598 1318 1322 Nps 11500 35 14C AMS Marine 13 NaN NaN 12874 Calib 7.1 NaN # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth depth,sediment,,centimeter,,paleoceanography,,,N,mid point of 1-cm slice down the core; depth at JPC15/27 is a composite as described in Keigwin et al. 2018 ## core notes,,,,,paleoceanography,,,C,core name ## delta_13C_Nps delta 13C,Neogloboquadrina pachyderma sinistral,,per mil PDB,,paleoceanography,,isotope ratio mass spectrometry,N,measured on Prism isotope ratio mass spectrometer, NOSAMS, Woods Hole ## delta_18O_Nps delta 18O,Neogloboquadrina pachyderma sinistral,,per mil PDB,,paleoceanography,,isotope ratio mass spectrometry,N,measured on Prism isoope ratio mass spectrometer, NOSAMS, Woods Hole ## delta_13C_C.neo delta 13C,Cassidulina neoteretis,,per mil PDB,,paleoceanography,,isotope ratio mass spectrometry,N,measured on Prism isotope ratio mass spectrometer, NOSAMS, Woods Hole ## delta_18O_C.neo delta 18O,Cassidulina neoteretis,,per mil PDB,,paleoceanography,,isotope ratio mass spectrometry,N,measured on Prism isotope ratio mass spectrometer, NOSAMS, Woods Hole #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN depth core delta_13C_Nps delta_18O_Nps delta_13C_C.neo delta_18O_C.neo 2 15JPC 0.770 1.590 -0.124 3.541 16 15JPC 0.755 1.917 NaN NaN 24 15JPC 0.849 2.193 NaN NaN 32 15JPC 0.764 1.964 NaN NaN 40 15JPC 0.789 2.270 NaN NaN 47 15JPC NaN NaN -0.391 4.077 50 15JPC 0.596 2.333 -0.041 4.236 53 15JPC NaN NaN -0.299 4.136 58 15JPC 0.721 2.448 -0.391 4.077 66 15JPC 0.726 2.636 -0.356 4.035 74 15JPC 0.514 2.743 -0.270 3.996 82 15JPC 0.676 2.653 -0.599 4.054 90 15JPC 0.513 2.349 NaN NaN 100 15JPC 0.363 2.147 -0.158 3.378 108 15JPC 0.543 2.444 -0.512 3.917 116 15JPC 0.563 2.410 -0.872 3.832 124 15JPC 0.480 2.409 -0.767 4.091 132 15JPC 0.423 2.525 NaN NaN 140 15JPC 0.279 2.726 -0.921 4.247 150 15JPC 0.371 2.411 -0.721 4.251 158 15JPC 0.298 2.727 NaN NaN 164 15JPC NaN NaN -0.587 4.185 166 15JPC 0.453 2.148 -0.703 4.111 168 15JPC NaN NaN -0.624 3.799 174 15JPC 0.363 2.777 -0.613 3.671 182 15JPC 0.417 2.925 -0.833 4.152 190 15JPC 0.328 2.855 -0.841 4.335 200 15JPC 0.342 3.329 -0.563 4.613 207 15JPC 0.203 3.123 NaN NaN 216 15JPC NaN NaN -0.607 4.244 224 15JPC 0.041 3.432 -0.558 4.186 232 15JPC 0.210 3.150 -0.603 4.104 240 15JPC 0.349 3.147 -0.757 4.386 250 15JPC 0.127 3.094 -0.480 4.322 258 15JPC 0.042 3.378 NaN NaN 266 15JPC 0.195 2.892 -0.539 4.083 274 15JPC 0.188 3.525 NaN NaN 276 15JPC NaN NaN -0.526 4.068 282 15JPC 0.187 3.064 NaN NaN 290 15JPC 0.236 3.450 NaN NaN 300 15JPC 0.143 3.306 -0.414 4.161 320 15JPC 0.314 2.887 -0.340 4.086 340 15JPC 0.342 2.881 -0.479 4.050 350 15JPC 0.014 3.151 -0.355 4.398 361 15JPC 0.038 2.728 -0.608 4.104 370 15JPC -0.071 2.949 -0.349 4.394 380 15JPC -0.019 3.047 -0.537 4.196 390 15JPC -0.032 3.288 -0.576 3.916 400 15JPC -0.013 2.879 -0.529 4.081 410 15JPC -0.132 2.932 NaN NaN 420 15JPC -0.167 2.806 -0.646 4.173 430 15JPC -0.040 3.144 -0.943 4.387 440 15JPC 0.165 1.892 -0.486 4.173 450 15JPC -0.019 1.689 -0.372 3.812 460 15JPC 0.041 1.751 -0.593 3.693 470 15JPC 0.025 0.865 -0.707 3.798 480 15JPC 0.120 1.106 -0.704 4.016 490 15JPC 0.028 0.701 -0.596 3.884 500 15JPC 0.073 1.742 -0.275 3.956 510 15JPC 0.145 1.663 -0.712 3.836 512 15JPC -0.05 1.673 NaN NaN 514 15JPC -0.26 1.984 NaN NaN 516 15JPC -0.21 2.564 NaN NaN 518 15JPC -0.19 2.573 NaN NaN 520 15JPC -0.004 2.645 -0.574 4.567 530 15JPC -0.071 2.279 -0.535 4.449 540 15JPC 0.177 1.979 NaN NaN 550 15JPC 0.111 2.041 -0.322 4.573 560 15JPC 0.052 2.245 NaN NaN 570 15JPC 0.044 2.344 -0.335 4.565 580 15JPC -0.056 2.221 -0.712 4.394 590 15JPC 0.060 2.338 -0.843 4.460 600 15JPC 0.106 1.965 -0.624 4.652 620 15JPC 0.003 2.821 -0.625 4.879 640 15JPC 0.154 1.985 -0.784 4.795 650 15JPC 0.101 2.318 -0.800 4.785 660 15JPC 0.043 1.981 -0.492 4.858 680 15JPC 0.005 2.849 -0.617 4.672 700 15JPC 0.068 2.125 -0.652 4.856 720 15JPC -0.069 2.009 NaN NaN 740 15JPC -0.083 2.061 NaN NaN 750 15JPC 0.021 1.600 NaN NaN 760 15JPC 0.039 2.317 NaN NaN 780 15JPC 0.093 1.726 NaN NaN 800 15JPC -0.004 2.197 -0.694 4.437 820 15JPC 0.131 2.343 NaN NaN 840 15JPC -0.036 2.558 NaN NaN 850 15JPC 0.050 2.347 -0.578 4.724 860 15JPC 0.101 1.526 NaN NaN 880 15JPC 0.133 2.254 NaN NaN 900 15JPC 0.026 2.269 -0.598 4.514 920 15JPC 0.095 2.237 NaN NaN 940 15JPC 0.091 2.101 NaN NaN 950 15JPC 0.142 1.913 -1.443 4.695 960 15JPC 0.198 2.374 NaN NaN 1000 15JPC 0.038 1.992 -0.670 4.747 1020 15JPC 0.037 1.842 NaN NaN 1040 15JPC 0.068 1.723 NaN NaN 1050 15JPC 0.035 1.845 -0.646 4.499 1060 15JPC 0.105 1.502 NaN NaN 1080 15JPC 0.146 2.101 NaN NaN 1100 15JPC 0.161 1.570 -0.557 4.703 1120 15JPC 0.010 1.275 NaN NaN 1140 15JPC -0.081 2.487 NaN NaN 1150 15JPC 0.088 1.936 -0.198 3.945 1158 15JPC 0.000 1.864 NaN NaN 1166 15JPC 0.053 1.800 NaN NaN 1174 15JPC 0.119 1.631 NaN NaN 1182 15JPC -0.059 2.135 NaN NaN 1190 15JPC 0.012 2.175 NaN NaN 1200 15JPC 0.010 2.844 NaN NaN 1208 15JPC -0.066 2.149 NaN NaN 1216 15JPC -0.086 2.286 NaN NaN 1224 15JPC -0.040 2.156 NaN NaN 1232 15JPC -0.044 2.054 NaN NaN 1240 15JPC -0.211 2.021 NaN NaN 1250 15JPC 0.190 1.523 NaN NaN 1258 15JPC -0.176 2.087 NaN NaN 1266 15JPC 0.002 1.343 NaN NaN 1274 15JPC 0.036 1.939 NaN NaN 1282 15JPC -0.109 2.120 NaN NaN 1290 15JPC -0.331 2.298 NaN NaN 1300 15JPC 0.031 2.387 NaN NaN 1307 JPC27 0.229 2.539 NaN NaN 1308 15JPC -0.007 1.824 NaN NaN 1315 JPC27 0.199 1.951 NaN NaN 1316 15JPC -0.104 1.943 NaN NaN 1319 JPC27 0.027 1.250 NaN NaN 1323 JPC27 0.112 0.483 NaN NaN 1327 JPC27 0.124 1.030 NaN NaN 1324 15JPC -0.002 0.786 -0.522 4.947 1332 JPC27 0.011 1.130 NaN NaN 1339 JPC27 -0.126 2.422 NaN NaN 1347 JPC27 -0.134 2.617 NaN NaN 1358 JPC27 -0.099 2.396 NaN NaN 1362 JPC27 -0.052 1.649 NaN NaN 1366 JPC27 -0.066 2.028 NaN NaN 1428 JPC27 -0.119 2.472 NaN NaN 1432 JPC27 -0.288 2.140 NaN NaN 1437 JPC27 -0.245 2.213 NaN NaN 1454 JPC27 -0.139 2.570 NaN NaN 1458 JPC27 -0.172 2.051 NaN NaN 1485 JPC27 -0.065 2.347 NaN NaN 1531 JPC27 0.057 2.070 NaN NaN 1565 JPC27 -0.056 2.282 NaN NaN 1576 JPC27 -0.002 1.980 NaN NaN 1594 JPC27 -0.126 1.930 NaN NaN 1637 JPC27 -0.032 2.035 NaN NaN 1657 JPC27 -0.078 2.665 NaN NaN 1662 JPC27 -0.005 2.079 NaN NaN 1669 JPC27 0.109 1.414 NaN NaN