# Northwestern Atlantic Foraminifera d13C Data over the last Four Millennia #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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/27891 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mellon2019/mellon2019-oce326_mc29d.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Data_Type: paleoceanography # # Dataset_DOI: # # Parameter_Keywords: carbon isotopes #-------------------- # Contribution_Date # Date: 2019-10-10 #-------------------- # File_Last_Modified_Date # Date: 2019-10-10 #-------------------- # Title # Study_Name: Northwestern Atlantic Foraminifera d13C Data over the last Four Millennia #-------------------- # Investigators # Investigators: Mellon, S.; Kienast, M.; Keigwin, L; Algar, C.; deMenocal, P.; Kienast, S.S.; Marchitto, T.; Moros, M.; Thomas, H. #--------------------------------------- # Description_Notes_and_Keywords # Description: #-------------------- # Publication # Authors: Mellon, S.; Kienast, M.; Algar, C.; deMenocal, P.; Kienast, S.S.; Marchitto, T.; Moros, M.; Thomas, H. # Published_Date_or_Year: 2019 # Published_Title: Foraminifera trace anthropogenic CO2 into the NW Atlantic by 1950 # Journal_Name: Geophysical Research Letters # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1029/2019GL084965 # Online_Resource: # Full_Citation: # Abstract: The Northwest Atlantic is a region of major climate change over the 20th century, affected by the weakening of the Atlantic meridional overturning circulation. To assess whether the ability of this region to absorb anthropogenic CO2 is also impacted by this change, we present the region’s first long-term carbon isotope (δ13C) time series of fossil foraminifera spanning the past 4,000 years. These records reveal an unprecedented negative δ13C excursion driven by anthropogenic CO2 penetration into the surface ocean, the ‘Suess effect’ signal. This signal (amplitude -0.45‰) emerges in 1950 AD±15 with a decrease rate of 0.009±0.001‰/yr. This marine signal is ~30% of the atmospheric Suess effect and emerges over a century later. Based on current estimates of the ratio of δ13CDIC change to DIC change and limited constraints on surface ocean residence times, we calculate a mean anthropogenic CO2 uptake rate of 0.6±0.2 µmol (kg yr)-1 from 1950 to 2005. #------------------ # Funding_Agency # Funding_Agency_Name: Marine Environmental Observation Prediction and Response (MEOPAR) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Environment and Climate Change Canada # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Natural Sciences and Engineering Research Council of Canada (NSERC) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Canadian Meteorological and Oceanographic Society (CMOS) # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Clean Nova Scotia # Grant: #------------------ # Site_Information # Site_Name: OCE326 MC29D # Location: North Atlantic Ocean # Country: Canada # Northernmost_Latitude: 45.883333 # Southernmost_Latitude: 45.883333 # Easternmost_Longitude: -62.8 # Westernmost_Longitude: -62.8 # Elevation: -250 #------------------ # Data_Collection # Collection_Name: OCE326-MC29D d13C Mellon2019 # Earliest_Year: 1255 # Most_Recent_Year: -39 # Time_Unit: calyrBP # Core_Length: 0.50 # Notes: Core collected July 1998 onboard R/V Oceanus #------------------ # Chronology_Information # Chronology: 14C and 210Pb. 14C was calibrated with Marine13 using Bacon age-depth modelling software. The software returns the full age-depth model, so no calibrated 14C dates are given here. Since this is a Bayesian method, no samples are rejected. # # 14C chronology information # ABBREVIATION VARIABLE_NAME UNIT # depth Average depth of sample interval (cm) # depth_top Depth top of sample interval (cm) # depth_bottom Depth bottom of sample interval (cm) # mat.dated Material Dated # Labcode sample identification used by 14C laboratory # 14C.raw conventional radiocarbon age, years before 1950AD # 14C.raw_err radiocarbon age, standard error # delta-R Deviation from global mean reservoir correction # delta-R_err delta-R standard error down # datemeth Dating method # calib_method calibration method # # depth depth_top depth_bottom mat.dated Labcode 14C.raw 14C.raw_err delta-R delta-R_err datemeth calib.method # 0.5 0 1 mixed BF OS-20560 375 30 81 76 14C AMS Bacon # 12.5 13 14 mixed PF OS-27370 255 60 81 76 14C AMS Bacon # 14.5 14 15 mixed PF OS-27369 375 60 81 76 14C AMS Bacon # 16.5 16 17 mixed PF OS-27393 505 120 81 76 14C AMS Bacon # 29.5 29 28 mixed PF OS-27372 960 70 81 76 14C AMS Bacon # 49.5 49 50 mixed PF OS-25803 2040 60 81 76 14C AMS Bacon # # 210Pb chronology information # depth Average depth of sample interval (cm) # Tot_Bq/g Total 210Pb (Bq/g) # Tot_error Total 210Pb, standard error (Bq/g) # Supp_Bq/g Supported 210Pb (Bq/g) # Supp_error Supported 210Pb, error (Bq/g) # XS_Bq/g Excess 210Pb (Bq/g) # XS_error Excess 210Pb (Bq/g) # # depth Tot_Bq/g Tot_error Supp_Bq/g Supp_error XS_Bq/g XS_error # 0.5 0.434886538 0.00839331 0.020234044 0.001458875 0.414652494 0.008519153 # 1.5 0.3861 0.0084 0.0175 0.0016 0.368598174 0.008526142 # 2.5 0.3263 0.0129 0.0227 0.0024 0.303602947 0.013143796 # 3.5 0.2718 0.012 0.0189 0.0027 0.252934919 0.01233763 # 4.5 0.1769 0.0099 0.0151 0.0022 0.161839047 0.010110364 # 5.5 0.1252 0.0094 0.0153 0.0026 0.109976342 0.00980572 # 7.5 0.107 0.0062 0.0166 0.0015 0.090320612 0.00633859 # 9.5 0.1027 0.0064 0.0174 0.0018 0.085361015 0.006651462 # 11.5 0.0892 0.005 0.0189 0.0013 0.070329408 0.005188917 # 14.5 0.0529 0.0051 0.0191 0.0016 0.033758899 0.005371649 # 19.5 0.0455 0.0059 0.0182 0.0019 0.027340931 0.006194109 # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # variables format: shortname what,material,error,units,seasonality,data_type,detail,method,data_format,additional_information) # ## depth_cm depth, ,,centimeter, ,paleoceanography,,,N, ## age_calBP age,,,calendar year before present,,paleoceanography,,,N, ## d13C_Npachy delta 13C,Neogloboquadrina pachyderma,, per mil VPDB,,paleoceanography,corrected,isotope ratio mass spectrometry, N, ## d13C_Clob delta 13C,Cibicidoides lobatulus,, per mil VPDB, ,paleoceanography, corrected, 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_calBP d13C_Npachy d13C_Clob 0.5 -39 0.61 -0.23 1.5 -35 NA -0.07 2.5 -31 0.47 -0.36 3.5 -27 0.64 0.24 4.5 -23 0.64 -0.41 5.5 -19 0.75 0.62 6.5 -14 0.82 -0.46 7.5 -10 0.72 0.59 8.5 -5 0.68 0.44 9.5 0 0.69 0.63 10.5 5 0.65 0.3 11.5 11 0.86 0.71 12.5 16 0.47 0.41 13.5 22 0.76 0.49 14.5 27 0.74 0.46 15.5 34 0.51 0.48 16.5 42 0.96 0.67 17.5 49 0.64 0.41 18.5 57 NA 0.37 19.5 64 0.67 0.3 20.5 79 0.48 0.18 21.5 102 0.89 0.63 22.5 124 0.43 0.48 23.5 146 0.38 0.64 24.5 168 0.7 0.82 25.5 201 0.69 0.56 26.5 244 0.65 0.46 27.5 288 0.54 0.59 28.5 333 0.56 0.4 29.5 375 0.41 0.25 30.5 420 0.74 0.54 31.5 467 0.64 0.66 32.5 514 0.41 0.58 33.5 560 0.8 0.4 34.5 606 0.48 0.45 35.5 649 0.58 0.37 36.5 690 0.47 0.57 37.5 730 0.87 0.38 38.5 771 0.72 0.44 39.5 811 1.07 0.61 40.5 852 1.05 0.66 41.5 893 1.36 0.84 42.5 933 NA 0.08 43.5 973 NA 0.62 44.5 1014 NA 0.49 45.5 1054 NA 0.41 46.5 1094 NA 0.51 47.5 1135 NA 0.79 48.5 1176 NA 0.77 49.5 1217 NA 0.42