# Atlantic Ocean 23,000 Year Benthic Foraminifera Stable Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # # Online_Resource: http://ncdc.noaa.gov/paleo/study/18496 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2015/oppo2015ggc25.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2015-04-13 #-------------------- # Title # Study_Name: Atlantic Ocean 23,000 Year Benthic Foraminifera Stable Isotope Data #-------------------- # Investigators # Investigators: Oppo, D.W.; Curry, W.B.; McManus, J.F. #-------------------- # Description_and_Notes # Description: Benthic isotope data from Atlantic cores used by Oppo et al. 2015. #-------------------- # Publication # Authors: Oppo, D.W., W.B. Curry, and J.F. McManus # Published_Date_or_Year: 2015-04-13 # Published_Title: What do benthic d13C and d18O data tell us about Atlantic circulation during Heinrich Stadial 1? # Journal_Name: Paleoceanography # Volume: 30 # Edition: # Issue: # Pages: # DOI: 10.1002/2014PA002667 # Online_Resource: http://onlinelibrary.wiley.com/doi/10.1002/2014PA002667/full # Full_Citation: # Abstract: Approximately synchronous with the onset of Heinrich Stadial 1 (HS1), d13C decreased throughout most of the upper (~1000-2500 m) Atlantic, and at some deeper North Atlantic sites. This early deglacial d13C decrease has been alternatively attributed to a reduced fraction of high-d13C North Atlantic Deep Water (NADW) or to a decrease in the NADW d13C source value. Here we present new benthic d18O and d13C records from three relatively shallow (~1450-1650 m) subpolar Northeast Atlantic cores. With published data from other cores, these data form a depth transect (~1200-3900 m) in the subpolar Northeast Atlantic. We compare Last Glacial Maximum (LGM) and HS1 data from this transect with data from a depth transect of cores from the Brazil Margin. The largest LGM-to-HS1 decreases in both benthic d13C and d18O occurred in upper waters containing the highest NADW fraction during the LGM. We show that the d13C decrease can be explained entirely by a lower NADW d13C source value, entirely by a decrease in the proportion of NADW relative to Southern Ocean Water, or by a combination of these mechanisms. However, building on insights from model simulations, we hypothesize that reduced ventilation due to a weakened but still active Atlantic Meridional Overturning Circulation also contributed to the low d13C values in the upper North Atlantic. We suggest that the benthic d18O gradients above ~2300 m at both core transects indicate the depth to which heat and North Atlantic deglacial freshwater had mixed into the subsurface ocean by early HS1. # #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE13-35191, OCE07-50880, OCE05-84911 #------------------ # Site_Information # Site_Name: EW9302-25GGC # Location: Ocean>Atlantic Ocean # Country: # Northernmost_Latitude: 62.06 # Southernmost_Latitude: 62.06 # Easternmost_Longitude: -21.47 # Westernmost_Longitude: -21.47 # Elevation: -1523 m #------------------ # Data_Collection # Collection_Name: Oppo2015ggc25 # Earliest_Year: 23525 # Most_Recent_Year: 757 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology: # # Table S2. EW9302 AMS radiocarbon dates converted to calendar age, and final age models. # # NOSAMS # Description Species 14C_age Age Error R Delta R corrected age error delta_13C cal_curve 1_or_2_sigma #_of_ranges cal_BP_ranges_(lower) (upper) rel._probability (lower) (upper) rel._prob. (lower) (upper) rel._prob. med._prob. AR ±DR Depth Age model Accumulaiton rate (cm/kyr) # 0 357 # OS-57647 EW9302 24GGC 0-1 G. bulloides 740 30 0 200 202.2 -0.2 marine13.14c 1 2 146 165 0.038 185 531 0.962 357 0 200 120.5 5028 25.79747377 # 2 1 0 638 1 357 260.5 9972 28.3171521 # OS-59666 EW9302 24GGC 120-121 G. bulloides 4760 45 0 200 215.4 -0.2 marine13.14c 1 1 4774 5317 1 5028 0 200 330.5 12699 25.66923359 # 2 1 4491 5562 1 5028 395.5 17457 13.66120219 # OS-59669 EW9302 24GGC 260-261 G. bulloides 9210 45 0 200 205 -0.8 marine13.14c 1 1 9686 10219 1 9972 0 200 420.5 18174 34.86750349 # 2 1 9488 10484 1 9972 562.5 23229 28.09099901 # OS-57648 EW9302 24GGC 300-301 G. bulloides 10250 45 150 200 205 -1 marine13.14c 1 1 10747 11323 1 11097 150 200 # 2 1 10566 11793 1 11097 # OS-68072 EW9302 24GGC 330-331 N. Pachyderma left coiling 11550 70 350 200 211.9 0.2 marine13.14c 1 1 12502 12950 1 12699 350 200 # 2 1 12120 13153 1 12699 # OS-68073 EW9302 24GGC 395-396 N. Pachyderma left coiling 15450 60 350 200 208.8 -0.1 marine13.14c 1 1 17172 17738 1 17457 700 200 # 2 1 16870 17983 1 17457 # OS-59699 EW9302 24GGC 420-421 N. Pachyderma left coiling 16150 75 300 200 213.6 0 marine13.14c 1 1 17932 18421 1 18174 800 200 # 2 1 17675 18649 1 18174 # OS-57649 EW9302 24GGC 562-563 N. Pachyderma left coiling 19950 95 260 200 221.4 0.1 marine13.14c 1 1 22955 23510 1 23229 260 200 # 2 1 22654 23782 1 23229 # OS-57650 EW9302 25GGC 1-2 G. bulloides 1180 30 0 200 202.2 -0.1 marine13.14c 1 1 555 919 1 757 0 200 # 2 1 421 1171 1 757 1.5 757 # OS-59832 EW9302 25GGC 100-101 G. bulloides 8620 60 0 200 208.8 -0.6 marine13.14c 1 1 9001 9484 1 9242 0 200 100.5 9242 11.66764879 # 2 1 8637 9743 1 9242 118.5 12754 5.125284738 # OS-68201 EW9302 25GGC 118-119 N. Pachyderma left coiling 11600 55 350 200 207.4 0.4 marine13.14c 1 1 12565 12972 1 12754 350 200 150.5 14925 14.73975127 # 2 1 12246 13208 1 12754 170.5 17255 8.583690987 # OS-68071 EW9302 25GGC 150-151 N. Pachyderma left coiling 13400 60 350 200 208.8 0 marine13.14c 1 1 14489 15312 1 14925 350 200 350.5 23525 28.70813397 # 2 1 14143 15633 1 14925 # OS-59831 EW9302 25GGC 170-171 N. Pachyderma left coiling 14950 90 350 200 219.3 -0.1 marine13.14c 1 1 16965 17580 1 17255 350 200 # 2 1 16604 17854 1 17255 # OS-59788 EW9302 25GGC 350-351 N. Pachyderma left coiling 20200 90 260 200 219.3 0.2 marine13.14c 1 1 23243 23821 1 23525 260 200 # 2 1 22969 24044 1 23525 # OS-57709 EW9302 26GGC 0-1 G. bulloides 985 30 0 200 202.2 0 marine13.14c 1 1 403 767 1 578 0 200 # 2 3 148 162 0.003 193 214 0.005 223 962 0.992 578 0.5 578 # OS-59791 EW9302 26GGC 60-61 G. bulloides 6300 40 0 200 204 -0.2 marine13.14c 1 1 6514 6997 1 6768 0 200 60.5 6768 9.693053312 # 2 1 6318 7220 1 6768 110.5 10904 12.08897485 # OS-68074 EW9302 26GGC 110-111 G. bulloides 10050 50 100 200 206.2 -1 marine13.14c 1 1 10664 11151 1 10904 100 200 130.5 11812 22.02643172 # 2 2 10302 10308 0.001 10312 11428 0.999 10904 190.5 14607 21.46690519 # OS-59830 EW9302 26GGC 130-131 N. Pachyderma left coiling 10900 90 340 200 219.3 0.5 marine13.14c 1 1 11348 12134 1 11812 340 200 240.5 17881 15.27183873 # 200 2 1 11192 12509 1 11812 350.5 22099 26.07871029 # OS-68075 EW9302 26GGC 190-191 N. Pachyderma left coiling 13250 60 400 200 208.8 0 marine13.14c 1 1 14207 14972 1 14607 400 200 # 2 1 13941 15277 1 14607 # OS-59789 EW9302 26GGC 240-241 N. Pachyderma left coiling 15800 60 300 200 208.8 0 marine13.14c 1 1 17618 18127 1 17881 700 200 # 2 1 17373 18399 1 17881 # OS-59790 EW9302 26GGC 350-351 N. Pachyderma left coiling 19100 80 440 200 215.4 0.1 marine13.14c 1 1 21883 22357 1 22099 440 200 # 2 1 21561 22527 1 22099 # # # # #---------------- # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ##depth_cm depth, , , cm, , , , ,N ##age_calBP age, , , calendar years before present, , , , ,N ##d13Ccibid delta13C, Cibicidoides, , per mil PDB, , , , ,N ##d18Ocibid delta18O, Cibicidoides, , per mil PDB, , , , ,N ##notes notes,,,,,,species,,C # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # depth_cm age_calBP d13Ccibid d18Ocibid notes 1.5 757 1.460493 2.686523 C. wuellerstorfi 10.5 1528.363636 1.263566 2.680923 C. wuellerstorfi 30.5 3242.505051 1.418566 2.721923 C. wuellerstorfi 40.5 4099.575758 1.361493 2.696523 C. wuellerstorfi 60.5 5813.717172 1.305566 2.863923 C. wuellerstorfi 70.5 6670.787879 1.365493 2.790523 C. wuellerstorfi 100.5 9242 0.735493 3.039523 C. wuellerstorfi 105.5 10217.55556 0.699428 2.973681 C. wuellerstorfi 107.5 10607.77778 0.816428 3.147681 C. wuellerstorfi 110.5 11193.11111 0.827566 3.050923 C. wuellerstorfi 113.5 11778.44444 0.670997 3.047417 C. wuellerstorfi 115.5 12168.66667 0.507997 3.130417 C. wuellerstorfi 118.5 12754 0.787428 3.055681 C. wuellerstorfi 123.5 13093.21875 1.156428 3.694681 C. wuellerstorfi 130.5 13568.125 0.502493 3.413523 C. wuellerstorfi 137.5 14043.03125 0.644997 3.245417 C. wuellerstorfi 140.5 14246.5625 0.406493 3.393523 C. wuellerstorfi 143.5 14450.09375 0.223997 3.400417 C. wuellerstorfi 147.5 14721.46875 0.439428 3.371681 C. wuellerstorfi 150.5 14925 0.408493 3.355523 C. wuellerstorfi 153.5 15274.5 0.442997 3.382417 C. wuellerstorfi 157.5 15740.5 0.498428 3.251681 C. wuellerstorfi 157.5 15740.5 0.327428 3.223681 C. wuellerstorfi 160.5 16090 0.508566 3.539923 C. wuellerstorfi 165.5 16672.5 0.625428 3.180681 C. wuellerstorfi 170.5 17255 1.398566 4.359923 C. wuellerstorfi 175.5 17429.16667 0.475997 3.308417 C. wuellerstorfi 177.5 17498.83333 1.360997 4.636416 C. wuellerstorfi 180.5 17603.33333 1.652493 4.567523 C. wuellerstorfi 200.5 18300 1.672493 4.653523 C. wuellerstorfi 210.5 18648.33333 1.528566 4.575923 C. wuellerstorfi 220.5 18996.66667 1.399566 4.480923 C. wuellerstorfi 230.5 19345 1.523566 4.628923 C. wuellerstorfi 235.5 19519.16667 1.548428 4.798681 C. wuellerstorfi 240.5 19693.33333 1.414493 4.721523 C. wuellerstorfi 245.5 19867.5 1.650997 4.652417 C. wuellerstorfi 250.5 20041.66667 1.552566 4.468923 C. wuellerstorfi 260.5 20390 1.644493 4.668523 C. wuellerstorfi 270.5 20738.33333 1.510566 4.441923 C. wuellerstorfi 280.5 21086.66667 1.551493 4.505523 C. wuellerstorfi 290.5 21435 1.460493 4.529523 C. wuellerstorfi 300.5 21783.33333 1.623566 4.615923 C. wuellerstorfi 310.5 22131.66667 0.827566 3.697923 C. wuellerstorfi 350.5 23525 1.417493 4.170523 C. wuellerstorfi