# Brazil Margin Deglacial Benthic Stable Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # # 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: https://www.ncdc.noaa.gov/paleo/study/19521 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2015/lund2015ggc90.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography # # Parameter_Keywords: oxygen isotopes, carbon isotopes #-------------------- # Contribution_Date # Date: 2015-11-05 #-------------------- # Title # Study_Name: Brazil Margin Deglacial Benthic Stable Isotope Data #-------------------- # Investigators # Investigators: Lund, D.C.; Tessin, A.C.; Hoffman, J.L.; Schmittner, A. #-------------------- # Description_and_Notes # Description: Benthic foraminiferal (Cibicidoides wuellerstorfi) stable isotope (d18O and d13C) data from # marine sediment cores collected on the Brazil Margin, Northeast Atlantic Ocean, for the deglacial interval. #-------------------- # Publication # Authors: D.C. Lund, A.C. Tessin, J.L. Hoffman, A. Schmittner # Published_Date_or_Year: 2015-05-06 # Published_Title: Southwest Atlantic water mass evolution during the last deglaciation # Journal_Name: Paleoceanography # Volume: 30 # Edition: # Issue: 5 # Pages: 477-494 # Report_Number: # DOI: 10.1002/2014PA002657 # Online_Resource: http://onlinelibrary.wiley.com/doi/10.1002/2014PA002657/full # Full_Citation: # Abstract: The rise in atmospheric CO2 during Heinrich Stadial 1 (HS1; 14.5-17.5 kyr B.P.) may have been driven by the release of carbon from the abyssal ocean. Model simulations suggest that wind-driven upwelling in the Southern Ocean can liberate 13C-depleted carbon from the abyss, causing atmospheric CO2 to increase and the d13C of CO2 to decrease. One prediction of the Southern Ocean hypothesis is that water mass tracers in the deep South Atlantic should register a circulation response early in the deglaciation. Here we test this idea using a depth transect of 12 cores from the Brazil Margin. We show that records below 2300 m remained 13C-depleted until 15 kyr B.P. or later, indicating that the abyssal South Atlantic was an unlikely source of light carbon to the atmosphere during HS1. Benthic d18O results are consistent with abyssal South Atlantic isolation until 15 kyr B.P., in contrast to shallower sites. The depth dependent timing of the d18O signal suggests that correcting d18O for ice volume is problematic on glacial terminations. New data from 2700 to 3000 m show that the deep SW Atlantic was isotopically distinct from the abyss during HS1. As a result, we find that mid-depth d13C minima were most likely driven by an abrupt drop in d13C of northern component water. Low d13C at the Brazil Margin also coincided with an ~80 per mil decrease in D14C. Our results are consistent with a weakening of the Atlantic meridional overturning circulation and point toward a northern hemisphere trigger for the initial rise in atmospheric CO2 during HS1. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-1003500, Graduate Research Fellowship Program #------------------ # Site_Information # Site_Name: KNR159-5-90GGC # Location: Ocean>Atlantic Ocean>North Atlantic Ocean # Country: # Northmost Latitude: -27.35 # Southmost Latitude: -27.35 # Eastmost Longitude: -46.63 # Westmost Longitude: -46.63 # Elevation: -1105 m #------------------ # Data_Collection # Collection_Name: Lund2015GGC90 # Earliest_Year: 19689 # Most_Recent_Year: 765 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology_Information # Chronology: # Table 2. Planktonic Radiocarbon Results for Cores Presented in This Paper *a # # Core Depth (cm) 14C age (years) Error (years) Calendar Age (yr B.P.) Error (years) Notes University of California-Irvine Accelerator Mass Spectrometry (UCIAMS) No. # # KNR159-5-14GGC # 3 1,605 15 1,138 203 94943 # 25 3,185 15 2,990 236 94944 # 57 5,965 20 6,404 221 94945 # 73 7,170 20 7,651 186 94946 # 89 9,210 20 9,955 262 94947 # 97 11,575 40 13,045 202 94948 # 114 14,160 40 16,630 307 94950 # 122 13,815 40 16,125 297 94951 # 118 13,987.5 40 16,378 427 average n/a # 170 16,060 230 18,939 344 94952 # # KNR159-5-90GGC # 30.5 4,790 20 5,064 248 92724 # 40.5 6,065 20 6,497 219 92725 # 50.5 8,000 25 8,490 246 92726 # 60.5 10,640 25 12,005 385 92727 # 70.5 12,080 30 13,546 205 92728 # 80.5 11,620 25 13,087 201 92729 # 75.5 11,850 39 13,317 287 average n/a # 90.5 12,630 30 14,252 361 92730 # 100.5 13,500 75 15,668 316 OS-27754 # 104.5 12,180 30 13,635 211 reversal 92731 # 110.5 11,530 30 12,998 199 reversal 92732 # 120.5 11,210 30 12,736 206 reversal 92733 # 130.5 10,805 30 12,263 302 reversal 92734 # 140.5 9,395 25 10,227 272 reversal 92735 # 144.5 12,450 50 13,921 285 reversal OS-34253 # 150.5 11,665 25 13,125 202 reversal 92736 # 200.5 16,700 95 19,689 281 OS-27755 # # KNR159-5-63GGC # 6.5 3,145 15 2,964 237 109707 # 14 8,310 20 8,844 262 154411 # 18.5 11,590 40 13,060 202 142506 # 21.5 12,150 40 13,608 210 142507 # 24.5 11,580 100 13,047 217 reversal 109708 # 30.5 14,930 90 17,693 267 154412 # 35 15,840 140 18,677 259 154413 # 42.5 11,665 40 12,810 520 reversal 109709 # 48.5 17,610 60 20,758 273 142508 # 60.5 17,600 80 20,748 281 109710 # 54.5 17,605 100 20,753 391 average n/a # 78.5 19,890 260 23,454 395 109711 # 96.5 24,430 170 28,077 257 109712 # # KNR159-5-20JPC # 5.5 2,935 20 2,670 254 92737 # 10.5 4,155 25 4,224 273 92738 # 25.5 7,515 25 7,974 205 92739 # 35.5 10,640 25 12,005 385 92740 # 45.5 9,385 30 10,215 275 reversal 92741 # 60.5 3,585 20 3,481 255 reversal 92742 # 70.5 9,180 70 9,926 269 reversal 92743 # 71.5 5,540 25 5,941 222 reversal 94722 # 80.5 10,840 320 12,171 518 reversal 92744 # 90.5 4,805 45 5,071 253 reversal 92745 # 95.5 4,245 35 4,345 280 reversal 92746 # 105.5 7,230 100 7,713 207 reversal 92747 # 115.5 12,780 170 14,520 440 reversal 92748 # 120.5 14,340 250 16,891 458 92749 # 135.5 16,270 370 19,175 471 92804 # 145.5 13,600 300 15,798 415 reversal 92805 # 170.5 17,270 80 20,335 262 92806 # 174 17,740 160 20,933 343 94723 # # *a In instances where nearby planktonic samples had calendar ages within ±1 standard deviation, # the samples were averaged to produce a mean age. All of the dates are based on G. ruber, and all # were run at UC Irvine with the exception of three samples for KNR159-5-90GGC, which were run at # Woods Hole Oceanographic Institution (WHOI) National Ocean Sciences Accelerator Mass Spectrometry # (100.5 cm, 144.5 cm, and 200.5 cm). These three dates were provided by Delia Oppo. n/a, not applicable. # # # # Benthic Radiocarbon Results for Core KNR-159-5-78GGC # # # Depth(cm) Planktonic 14C Age (yr) Planktonic 14C Age Error (yr) INTCAL13 Calendar Age (yr) INTCAL13 Calendar Age Error (yr) Benthic Fmod Benthic Fmod (error) Benthic 14C Age (yr) Benthic 14C Age Error (yr) UCIAMS# (benthic) Benthic D14C (per mil) Low Age (yr BP) Low D14C (per mil) High Age (yr BP) High D14C (per mil) Benthic DD14C (per mil) High Age (yr BP) Low DD14C (per mil) Low Age (yr BP) High DD14C (per mil) # 1 1235 15 799.5 185.5 0.7506 0.0029 2305 35 109736 -173 616 -192 986 -154 -162 986 -186 616 -138 # 9 5810 15 6203 221 0.4587 0.0021 6260 40 109737 -28 5983 -55 6425 -2 -107 6425 -133 5983 -82 # 13 7530 20 7987.5 204.5 0.3247 0.0025 9040 70 109738 -146 7786 -168 8193 -124 -224 8193 -248 7786 -199 # 17 8800 25 9466.5 264.5 0.2694 0.0014 10535 45 109739 -152 9203 -180 9738 -125 -247 9738 -274 9203 -220 # 25 10390 20 11525.5 320.5 0.2230 0.0010 12055 40 109740 -100 11210 -135 11852 -65 -262 11852 -281 11210 -242 # 33 12475 35 13956 293 0.1911 0.0010 13295 45 109741 35 13666 -2 14252 72 -168 14252 -198 13666 -138 # 37 12685 35 14341 367 0.1813 0.0009 13715 40 109742 29 13983 -16 14713 75 -194 14713 -218 13983 -171 # 45 13435 40 15585 300 0.1647 0.0014 14490 70 109743 86 15292 46 15888 127 -217 15888 -244 15292 -190 # 49 13785 35 16078.5 293.5 0.1598 0.0010 14730 60 109744 118 15782 78 16377 159 -206 16377 -236 15782 -176 # 57 14105 45 16558 307 0.1525 0.0009 15105 50 109745 131 16248 88 16866 174 -214 16866 -242 16248 -186 # 61 14065 30 16501.5 303.5 0.1536 0.0009 15050 50 109746 131 16199 89 16805 173 -211 16805 -238 16199 -183 # 89 14960 60 17722.5 250.5 0.1401 0.0007 15790 45 109747 196 17473 159 17972 232 -198 17972 -230 17473 -166 # 97 15040 70 17803.5 254.5 0.1392 0.0007 15840 40 109748 200 17553 163 18057 237 -196 18057 -229 17553 -163 # 105 15360 50 18184.5 236.5 0.1397 0.0008 15810 50 109749 261 17946 224 18423 298 -141 18423 -174 17946 -108 # 113 15725 40 18575 214 0.1316 0.0008 16295 50 109750 245 18361 212 18790 278 -161 18790 -195 18361 -127 # 117 15720 60 18570.5 219.5 0.1278 0.0009 16520 60 109751 209 18355 176 18789 242 -198 18789 -231 18355 -164 # 125 16160 60 19023.5 236.5 0.1220 0.0008 16900 60 109752 218 18784 182 19258 254 -185 19258 -220 18784 -151 # 137 16700 70 19690 269 0.1168 0.0009 17250 70 109753 265 19420 222 19960 307 -155 19960 -191 19420 -119 # 145 16460 40 0.1141 0.0008 17440 60 109754 # 153 16990 60 19998 268 0.1101 0.0010 17720 80 109755 237 19726 195 20264 279 -190 20264 -226 19726 -154 # 165 16245 45 0.1119 0.0008 17590 60 109756 # # #---------------- # Variables # # Data variables follow 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_calkaBP age, , , calendar Kyears before present, , , , ,N ## d13Cc.wuell>250 delta 13C, Cibicidoides wuellerstorfi >250 micron, , per mil VPDB, ,Paleoceanography, , ,N ## d18Oc.wuell>250 delta 18O, Cibicidoides wuellerstorfi >250 micron, , per mil VPDB, ,Paleoceanography, , ,N ## numanal Number of Analyses, , , , , , , ,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # depth_cm age_calkaBP d13Cc.wuell>250 d18Oc.wuell>250 numanal 0.5 0.765 1.16 2.49 1 4.5 1.338 1.37 2.5 1 8.5 1.911 1.26 2.25 1 12.5 2.485 1.36 2.36 1 16.5 3.058 1.4 2.53 1 20.5 3.631 1.36 2.48 1 24.5 4.204 1.34 2.5 1 28.5 4.777 1.19 2.27 1 32.5 5.351 1.29 2.33 1 36.5 5.924 1.28 2.29 1 40.5 6.497 1.29 2.48 1 48.5 8.091 1.14 2.47 1 52.5 9.193 1.14 2.42 1 56.5 10.599 1.08 2.41 1 60.5 12.005 1.17 2.76 1 64.5 12.355 0.98 3.22 1 68.5 12.705 1 3.43 1 72.5 13.055 1 3.54 1 76.5 13.379 1.02 3.66 1 80.5 13.629 0.87 3.55 1 84.5 13.878 0.77 3.33 1 88.5 14.127 0.79 3.69 1 92.5 14.535 0.71 3.81 1 96.5 15.102 0.85 3.81 1 100.5 15.668 0.77 3.83 1 104.5 15.829 0.88 3.85 1 108.5 15.990 0.76 3.79 1 112.5 16.151 0.85 4.14 1 116.5 16.311 0.75 3.85 1 120.5 16.472 0.75 3.94 1 124.5 16.633 0.87 4.26 1 128.5 16.794 0.49 4.22 1 132.5 16.955 0.45 4.25 1 136.5 17.116 0.77 4.25 1 140.5 17.276 0.7 4.3 1 144.5 17.437 0.38 4.43 1 148.5 17.598 0.61 4.38 1 152.5 17.759 0.61 4.37 1 160.5 18.081 0.24 4.2 1 164.5 18.241 0.22 4.09 1 168.5 18.402 0.29 4.28 1 172.5 18.563 0.4 4.18 1 176.5 18.724 0.42 4.34 1 180.5 18.885 0.44 4.18 1 184.5 19.046 0.25 4.24 1 188.5 19.206 0.31 4.16 1 192.5 19.367 0.36 4.23 1 196.5 19.528 0.4 4.15 1 200.5 19.689 0.41 4.3 1