# Bulk sediment nitrogen isotopes from the northern Peru Margin over the last 25 kyr #----------------------------------------------------------------------- # 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/25430 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2018/bova2018-cdh26-d15n.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: nitrogen isotopes, carbon isotopes #--------------------------------------- # Contribution_Date # Date: 2018-10-15 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-10-15 #--------------------------------------- # Title # Study_Name: Bulk sediment nitrogen isotopes from the northern Peru Margin over the last 25 kyr #--------------------------------------- # Investigators # Investigators: Bova, Samantha C.; Herbert, Timothy D.; Altabet, Mark A. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: deglaciation, upwelling, Younger Dryas #--------------------------------------- # Publication # Authors: Bova, S.C., T.D. Herbert, and M.A. Altabet # Published_Date_or_Year: in press # Published_Title: Ventilation of northern and southern sources of aged carbon in the eastern equatorial Pacific during the Younger Dryas rise in atmospheric CO2 # Journal_Name: Paleoceanography and Paleoclimatology # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: # Online_Resource: # Full_Citation: # Abstract: Atmospheric carbon dioxide (CO2) levels rose by ~90 ppmv during the last deglaciation, but the source of this carbon remains unknown. One popular hypothesis suggests carbon accumulated in the deep Southern Ocean, becoming increasingly radiocarbon (14C)-depleted during the last glacial period, and was released into Antarctic Intermediate Water (AAIW) and, subsequently, the atmosphere during deglaciation. Detection of extremely 14C-deplete carbon in the intermediate-depth tropical oceans during periods of atmospheric CO2 rise was initially considered the "smoking gun" for the hypothesis, but attempts to reproduce the anomalies closer to the Southern Ocean source have largely failed. Here, we present new 14C records from four cores recovered at intermediate depths in the eastern equatorial Pacific (EEP). In the context of additional geochemical records, including benthic foraminiferal stable isotopes and sedimentary nitrogen isotopes, we demonstrate that the extreme 14C anomalies observed during the last deglaciation do not reflect the radiocarbon content of AAIW. We show that, although AAIW likely transported modestly 14C-deplete carbon to the EEP subsurface, the extreme 14C signatures might reflect a distinct source of aged carbon arriving from the north, suggesting the North Pacific helped transport deep ocean carbon to the atmosphere during the last deglaciation. In the EEP, additional local hydrothermal inputs of 14C-free carbon near the Galapagos Islands magnified the already low-14C signatures. Finally, regardless of arrival route (North/South Pacific or hydrothermal), 14C-deplete carbon was released from the EEP subsurface during a late deglacial pulse of renewed upwelling, likely contributing to the Younger Dryas rise in atmospheric CO2. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: OCE-1003387 #--------------------------------------- # Site_Information # Site_Name: KNR195-5 CDH26 # Location: Eastern Pacific Ocean # Country: # Northernmost_Latitude: -3.986 # Southernmost_Latitude: -3.986 # Easternmost_Longitude: -81.3086666666667 # Westernmost_Longitude: -81.3086666666667 # Elevation: -1023 #--------------------------------------- # Data_Collection # Collection_Name: CDH26 d15N Bova2018 # First_Year: 25521 # Last_Year: 3275 # Time_Unit: cal yr BP # Core_Length: 25.39 # Notes: #--------------------------------------- # Chronology_Information # Chronology: # # Labcode # depth_top # depth_bottom # mat.dated # 14C.raw # 14C.raw_err # datemeth # reservoir age # calib.14C # calib.14C_97.5% confidence interval lower bound # calib.14C_97.5% confidence interval upper bound # calib_method # calib_curve # # Labcode depth_top depth_bottom mat.dated 14C.raw 14C.raw_err datemeth reservoir age calib.14C calib.14C_97.5% confidence interval lower bound calib.14C_97.5% confidence interval upper bound calib_method calib_curve # OS-84131 96.25 95.75 Neogloboquadrina dutertrei 3970 30 14C AMS 466.8 3730 3641 3823 Bchron IntCal13 # OS-84109 171.75 171.25 Neogloboquadrina dutertrei 5980 35 14C AMS 563 6244 6195 6295 Bchron IntCal13 # OS-84125 203.75 203.25 Neogloboquadrina dutertrei 6320 35 14C AMS 548.4 6594 6499 6661 Bchron IntCal13 # OS-84164 235.75 235.25 Neogloboquadrina dutertrei 7070 35 14C AMS 508.2 7442 7357 7503 Bchron IntCal13 # OS-84113 267.75 267.25 Neogloboquadrina dutertrei 7440 35 14C AMS 515.8 7738 7677 7817 Bchron IntCal13 # OS-84111 325.25 324.75 Neogloboquadrina dutertrei 8550 40 14C AMS 578.6 8873 8726 9003 Bchron IntCal13 # NA 350.75 351.25 benthic d18o NaN NaN Correlation to EPICA Dome C NaN 9372 9274 9472 Bchron NaN # NA 541.25 541.75 benthic d18o NaN NaN Correlation to EPICA Dome C NaN 11587 11489 11688 Bchron NaN # NA 662.25 662.75 benthic d18o NaN NaN Correlation to EPICA Dome C NaN 12568 12467 12666 Bchron NaN # NA 967.75 968.25 benthic d18o NaN NaN Correlation to EPICA Dome C NaN 14899 14809 15006 Bchron NaN # NA 1091.75 1092.25 benthic d18o NaN NaN Correlation to EPICA Dome C NaN 15662 15556 15753 Bchron NaN # NA 1482.75 1483.25 benthic d18o NaN NaN Correlation to EPICA Dome C NaN 17715 17601 17799 Bchron NaN # OS-84117 1619.75 1619.25 Neogloboquadrina dutertrei 16250 65 14C AMS 709 18784 18658 18881 Bchron IntCal13 # OS-84114 1741.25 1740.75 Neogloboquadrina dutertrei 17050 70 14C AMS 712.4 19682 19544 19876 Bchron IntCal13 # OS-84118 1895.25 1894.75 Neogloboquadrina dutertrei 17700 70 14C AMS 754 20468 20281 20612 Bchron IntCal13 # OS-84158 2048.25 2047.75 Neogloboquadrina dutertrei 18850 110 14C AMS 714.5 21922 21666 22242 Bchron IntCal13 # OS-84119 2169.25 2168.75 Neogloboquadrina dutertrei 20200 85 14C AMS 923 22620 23187 23627 Bchron IntCal13 # OS-84129 2265.25 2264.75 Neogloboquadrina dutertrei 19700 85 14C AMS 261 22918 22601 23003 Bchron IntCal13 # OS-84163 2386.25 2385.75 Neogloboquadrina dutertrei 20900 80 14C AMS 744.200000000001 24223 24052 24381 Bchron IntCal13 # OS-101832 2418.25 2417.75 Neogloboquadrina dutertrei 21500 150 14C AMS 891.400000000001 24888 24554 25387 Bchron IntCal13 # OS-84126 2539.25 2538.75 Neogloboquadrina dutertrei 21900 95 14C AMS 756.049999999999 25518 25294 25684 Bchron IntCal13 # #--------------------------------------- # 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_cm depth,,,centimeter,,,,,N, ## age_calyr age,,,calendar year before present,,,,,N, ## d15n_sediment delta 15N,sediment,,per mil,,paleoceanography,,isotope ratio mass spectrometry,N, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA depth_cm age_calyr d15n_sediment 16 3275 5.09 16 3276 5.11 32 3362 5.10 32 3363 5.07 48 3451.5 4.99 48 3454 4.97 64 3542 4.97 64 3543 4.96 80 3625 5.10 80 3625.5 5.14 96 3724.5 5.16 96 3739 5.16 112 4270 5.23 112 4278 5.18 128 4796.5 5.13 128 4807 5.13 155 5692 5.32 155 5702 5.25 171 6219 5.23 171 6233 5.24 187 6413 5.27 187 6417 5.28 203 6584 5.44 203 6590 5.37 219 7001 5.46 219 7010 5.38 235 7425 5.44 235 7434 5.38 251 7585 5.38 251 7587 5.24 251 7589 5.70 267 7728 5.50 267 7731 5.58 267 7733 5.66 283 8042 5.60 283 8049.5 5.59 309 8548 5.64 309 8552 5.67 309 8557 5.72 325 8864 5.82 325 8874 5.81 325 8881 5.86 341 9177 5.91 341 9182 5.87 341 9186 5.83 357 9462 5.91 357 9464.5 5.83 357 9467.5 5.90 373 9647 5.94 373 9651 5.84 389 9835.5 5.84 389 9839 5.85 405 10022.5 5.98 405 10026.5 5.98 421 10205 5.93 421 10208 5.89 437 10381 5.83 437 10385 5.89 462 10663 6.00 462 10667 5.86 478 10845.5 5.86 478 10849 5.88 494 11027 5.84 494 11029 5.77 510 11205.5 5.75 510 11210 5.82 526 11386 5.81 526 11389 5.92 526 11391 6.06 542 11592 5.66 542 11597 5.61 558 11727.5 5.56 558 11729 5.66 558 11731 5.89 574 11852.5 5.65 574 11855 5.56 590 11979 5.75 590 11982 5.74 615 12182 5.73 615 12184 5.72 631 12310 5.76 631 12312 5.77 631 12313 5.81 647 12430.5 5.75 647 12433 5.76 663 12572 6.03 663 12578 6.07 679 12707 6.14 679 12709 6.05 695 12823 6.11 695 12824.5 6.10 711 12941 6.17 711 12944 6.25 727 13060.5 6.24 727 13062.5 6.27 768 13376 6.29 768 13380 6.29 784 13495 6.24 784 13498.5 6.39 784 13500 6.28 800 13619 6.52 800 13620.5 6.42 816 13739.5 6.29 816 13742 6.34 832 13857 6.16 832 13860.5 6.29 848 13981 6.46 848 13983.5 6.32 865 14108.5 6.33 865 14110.5 6.22 865 14113.5 6.38 880 14216 6.49 880 14218 6.38 880 14219 6.42 880 14220 6.49 896 14331.5 6.29 896 14333.5 6.17 896 14334.5 6.32 923 14533 6.18 923 14537.5 6.22 923 14539 6.35 939 14659 6.14 955 14781 6.02 971 14935 5.92 987 15031 5.85 1003 15120 5.75 1003 15121 5.80 1003 15122.5 5.87 1003 15124 5.84 1019 15214 5.87 1019 15215.5 5.78 1019 15216.5 5.85 1019 15218 5.91 1035 15307 5.86 1035 15308 5.91 1035 15309 5.76 1035 15310 5.80 1051 15400 5.84 1051 15401 5.62 1051 15403 5.73 1076 15546 5.96 1076 15548 5.87 1092 15655 5.82 1092 15660 5.89 1092 15664 5.91 1108 15768 5.95 1108 15768.5 5.88 1108 15771 5.82 1124 15850.5 5.74 1124 15851.5 5.81 1140 15934.5 5.92 1140 15937 5.97 1172 16012 5.84 1172 16014.5 5.96 1172 16015 5.99 1188 16097.5 5.89 1188 16099 5.95 1188 16099 5.97 1204 16183 5.83 1204 16185 5.80 1204 16186 5.84 1231 16260 5.65 1231 16262.5 5.68 1247 16264.5 5.57 1247 16403 5.59 1247 16405 5.43 1247 16479.5 5.39 1156 16480.5 5.82 1156 16481.5 5.70 1156 16483 5.78 1263 16563 5.57 1263 16565 5.58 1279 16645 5.32 1279 16646 5.47 1279 16646.5 5.55 1295 16727.5 5.29 1295 16728.5 5.40 1327 16880.5 5.35 1327 16882.5 5.41 1343 16959 5.28 1343 16960 5.38 1359 17033 5.37 1359 17035 5.30 1385 17164.5 5.42 1385 17165.5 5.22 1385 17166 5.38 1400 17237.5 5.22 1400 17238.5 5.12 1400 17239 5.21 1416 17315 5.40 1416 17317 5.42 1432 17399.5 5.30 1432 17400 5.35 1448 17490.5 5.43 1448 17491.5 5.37 1464 17579 5.08 1464 17580.5 5.09 1480 17674 5.30 1480 17677 5.36 1496 17819 5.08 1496 17822 5.07 1512 17941.5 5.46 1512 17944.5 5.51 1539 18148 5.21 1539 18151.5 5.29 1555 18268.5 5.51 1555 18270.5 5.36 1555 18273 5.72 1571 18391.5 5.59 1571 18393 5.48 1571 18395 5.68 1587 18518 5.17 1587 18520 5.30 1603 18635 5.27 1603 18637 5.27 1619 18768 5.35 1619 18773 5.20 1635 18906 5.43 1635 18908 5.38 1651 19024 5.49 1651 19028 5.47 1667 19143 5.30 1667 19146 5.38 1693 19324.5 5.16 1693 19327 5.24 1709 19436.5 5.69 1709 19440 5.71 1725 19544 5.53 1725 19547 5.50 1741 19681 5.16 1741 19685.5 5.36 1757 19791 5.41 1757 19792 5.39 1773 19864 5.45 1773 19865.5 5.52 1789 19936.5 5.44 1789 19938.5 5.37 1805 20009 5.30 1805 20010.5 5.29 1821 20085 5.29 1821 20087 5.29 1847 20207 5.82 1847 20209 5.83 1863 20283 5.62 1863 20285 5.58 1879 20361.5 5.58 1879 20364 5.70 1895 20466 5.65 1895 20474 5.52 1911 20636 5.77 1911 20638 5.79 1927 20778 5.63 1927 20781 5.79 1943 20929 5.91 1943 20932 5.92 1959 21079 5.56 1959 21083 5.66 1975 21224 5.59 1975 21226.5 5.68 2000 21445 6.30 2000 21448 6.37 2016 21589 5.99 2016 21591 6.09 2032 21735 5.97 2032 21740 5.92 2048 21916 5.95 2048 21923 5.96 2064 22049 6.02 2064 22051 6.05 2080 22138.5 5.68 2080 22140.5 5.64 2096 22217 5.66 2096 22218.5 5.61 2120 22335.5 5.74 2120 22338.5 5.58 2128 22383.5 5.45 2128 22385 5.43 2153 22509.5 5.72 2153 22512.5 5.67 2169 22618 5.52 2169 22623 5.52 2185 22685 5.90 2185 22686 6.16 2201 22724 5.99 2201 22725 6.05 2217 22757 5.32 2217 22757 5.29 2233 22796.5 5.57 2233 22798 5.47 2249 22844 5.33 2249 22844.5 5.38 2265 22915 5.65 2265 22920 5.50 2281 23149.5 5.45 2281 23155.5 5.32 2306 23429.5 5.49 2306 23435.5 5.41 2322 23589 5.17 2322 23593 5.15 2338 23748 5.53 2338 23753 5.53 2354 23908 5.60 2354 23912.5 5.61 2370 24058.5 5.57 2370 24061 5.48 2386 24219 5.54 2386 24227 5.57 2402 24549 5.29 2418 24884 4.75 2418 24892 4.88 2434 25001 5.38 2434 25002 5.36 2459 25120.5 5.06 2459 25122 5.06 2475 25195 5.09 2475 25195.5 5.10 2491 25265 4.89 2491 25267 5.02 2507 25342.5 5.12 2507 25343.5 5.27 2523 25417 5.86 2523 25419 6.08 2539 25517 4.97 2539 25521 4.97