# Atlantic Ocean Stable Isotope, Geochemistry and Cadmium Seawater Data over the last 25,000 years #----------------------------------------------------------------------- # 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/25010 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2018/oppo2018-knr197-3-36.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: oxygen isotopes, carbon isotopes, geochemistry #--------------------------------------- # Contribution_Date # Date: 2018-09-04 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-09-04 #--------------------------------------- # Title # Study_Name: Atlantic Ocean Stable Isotope, Geochemistry and Cadmium Seawater Data over the last 25,000 years #--------------------------------------- # Investigators # Investigators: Oppo, Delia W. #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Oppo, D.W., Gebbie, G. , Huang, K. , Curry, W.B., Marchitto, T.M. and Pietro, K.R. # Published_Date_or_Year: 2018 # Published_Title: Data Constraints on Glacial Atlantic Water Mass Geometry and Properties # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 33 # Edition: # Issue: # Pages: 1013-1034 # Report_Number: # DOI: 10.1029/2018PA003408 # Online_Resource: # Full_Citation: # Abstract: The chemical composition of benthic foraminifera from marine sediment cores provides information on how glacial subsurface water properties differed from modern, but separating the influence of changes in the origin and end-member properties of subsurface water from changes in flows and mixing is challenging. Spatial gaps in coverage of glacial data add to the uncertainty. Here we present new data from cores collected from the Demerara Rise in the western tropical North Atlantic, including cores from the modern tropical phosphate maximum at Antarctic Intermediate Water (AAIW) depths. The results suggest lower phosphate concentration and higher carbonate saturation state within the phosphate maximum than modern despite similar carbon isotope values, consistent with less accumulation of respired nutrients and carbon, and reduced air-sea gas exchange in source waters to the region. An inversion of new and published glacial data confirms these inferences and further suggests that lower preformed nutrients in AAIW, and partial replacement of this still relatively high-nutrient AAIW with nutrient-depleted, carbonate-rich waters sourced from the region of the modern-day northern subtropics, also contributed to the observed changes. The results suggest that glacial preformed and remineralized phosphate were lower throughout the upper Atlantic, but deep phosphate concentration was higher. The inversion, which relies on the fidelity of the paleoceanographic data, suggests that the partial replacement of North Atlantic sourced deep water by Southern Ocean Water was largely responsible for the apparent deep North Atlantic phosphate increase, rather than greater remineralization. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: #--------------------------------------- # Funding_Agency # Funding_Agency_Name: WHOI Internal # Grant: #--------------------------------------- # Site_Information # Site_Name: KNR197-3-36GGC # Location: North Atlantic Ocean # Country: # Northernmost_Latitude: 8.42 # Southernmost_Latitude: 8.42 # Easternmost_Longitude: -52.79 # Westernmost_Longitude: -52.79 # Elevation: -2422 #--------------------------------------- # Data_Collection # Collection_Name: KNR197-3-36GGC Oppo2018 # First_Year: # Last_Year: # Time_Unit: # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: # KNR 197-3-36GGC # LabCode Labcode for radiocarbon measurement # Depth Depth (cm) # Species Species # 14C Raw radiocarbon age # Err Reported error # C13 d13C ‰ (sometimes blank, 1 ‰ assumed) # Calib_curve Calibration curve # Sigma_range Sigma range: 1_or_2_sigma # #_of_ranges Number of ranges # upper Upper age bound (Before Present) # lower Lower age bound (Before Present) # rel_probability Relative probability # med_prob Median Probability # notes Notes if rejected from age model in Column 1 # # Lab_code Depth (cm) Species 14C_age corrected_+/- delta_13C cal_curve 1_or_2_sigma #_of_ranges lower range (upper) rel._probability med._prob. NaN # OS-106974 0.5 G. sacc/G ruber 4370 25 2 marine13.14c 1 1 4445 4545 1 4505 NaN # OS-106974 0.5 G. sacc/G ruber 4370 25 2 marine13.14c 2 1 4415 4598 1 4505 NaN # OS-106975 8.5 G. ruber 6740 35 1.9 marine13.14c 1 1 7229 7312 1 7270 NaN # OS-106975 8.5 G. ruber 6740 35 1.9 marine13.14c 2 1 7175 7360 1 7270 NaN # OS-106976 16.5 G. ruber 7730 45 2 marine13.14c 1 1 8152 8271 1 8203 NaN # OS-106976 16.5 G. ruber 7730 45 2 marine13.14c 2 1 8070 8317 1 8203 NaN # OS-106977 28.5 G. sacc/G ruber 12800 50 1.5 marine13.14c 1 1 14263 14627 1 14458 NaN # OS-106977 28.5 G. sacc/G ruber 12800 50 1.5 marine13.14c 2 1 14149 14800 1 14458 NaN # OS-106978 36.5 G. sacc/G ruber 16000 65 1.4 marine13.14c 1 1 18776 18907 1 18843 NaN # OS-106978 36.5 G. sacc/G ruber 16000 65 1.4 marine13.14c 2 1 18702 18984 1 18843 NaN # OS-107774 40.5 G. ruber 14450 50 0.9 marine13.14c 1 1 16967 17175 1 17069 NaN # OS-107774 40.5 G. ruber 14450 50 0.9 marine13.14c 2 1 16831 17326 1 17069 NaN # OS-106979 48.5 G. ruber 17900 80 1.1 marine13.14c 1 1 20985 21272 1 21132 NaN # OS-106979 48.5 G. ruber 17900 80 1.1 marine13.14c 2 1 20861 21413 1 21132 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_cm depth,,,centimeter,,paleoceanography,,,N, ## d13C_c.pachy delta 13C,benthic foraminifer,,per mil VPDB,,paleoceanography,,,N,species analyzed shown in species field ## d18O_c.pachy delta 18O,benthic foraminifer,,per mil VPDB,,paleoceanography,,,N,species analyzed shown in species field ## species notes,,,,,paleoceanography,,,C,Species used for isotope analysis #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA depth_cm d13C_c.pachy d18O_c.pachy species 0.50 1.12 2.69 C. pachyderma 0.50 1.12 2.67 C. pachyderma 2.50 1.42 2.63 C. wuellerstorfi 2.50 1.34 2.67 C. wuellerstorfi 4.50 1.13 2.14 C. pachyderma 4.50 1.32 2.43 C.wuellerstorfi 6.50 1.45 2.66 C. wuellerstorfi 6.5 1.49 2.75 C. wuellerstorfi 8.50 1.31 2.72 C.wuellerstorfi 8.50 1.42 2.59 C.wuellerstorfi 10.5 0.16 3.99 C. wuellerstorfi 10.5 1.41 2.58 C. wuellerstorfi 12.50 1.30 2.83 C.wuellerstorfi 12.50 1.16 2.75 C.wuellerstorfi 14.5 0.81 2.99 C. wuellerstorfi 14.5 0.42 3.56 C. wuellerstorfi 16.50 0.48 3.08 C.wuellerstorfi 16.50 0.96 3.05 C.wuellerstorfi 18.5 0.58 4.51 C. wuellerstorfi 18.5 0.44 3.02 C. wuellerstorfi 20.50 0.61 3.11 C. wuellerstorfi 20.50 0.62 3.22 C. wuellerstorfi 20.50 0.54 3.03 C.wuellerstorfi 20.50 0.56 4.50 C.wuellerstorfi 22.5 0.46 3.21 C. wuellerstorfi 22.5 0.59 3.06 C. wuellerstorfi 24.50 0.42 3.15 C.wuellerstorfi 24.50 0.59 3.08 C.wuellerstorfi 26.5 0.45 3.16 C. wuellerstorfi 26.5 1.04 3.75 C. wuellerstorfi 28.50 1.10 3.63 C.wuellerstorfi 28.50 0.84 3.58 C.wuellerstorfi 30.5 1.14 3.65 C. wuellerstorfi 30.5 0.16 3.96 C. wuellerstorfi 32.50 0.38 4.25 C.wuellerstorfi 32.50 0.14 4.08 C.wuellerstorfi 34.5 0.75 4.65 C. wuellerstorfi 34.5 0.65 4.68 C. wuellerstorfi 36.50 0.69 4.40 C.wuellerstorfi 36.50 0.40 4.35 C.wuellerstorfi 38.5 0.53 4.64 C. wuellerstorfi 38.5 0.71 4.57 C. wuellerstorfi 40.50 0.42 3.68 C. wuellerstorfi 40.50 0.50 4.54 C.wuellerstorfi 40.50 0.44 3.53 C.wuellerstorfi 42.5 0.64 4.66 C. wuellerstorfi 42.5 0.32 4.27 C. wuellerstorfi 44.50 0.60 4.57 C.wuellerstorfi 44.50 0.78 4.53 C.wuellerstorfi 46.5 0.68 4.60 C. wuellerstorfi 46.5 0.82 4.70 C. wuellerstorfi 48.50 0.80 4.66 C.wuellerstorfi 48.50 0.75 4.52 C.wuellerstorfi 50.5 0.75 4.51 C. wuellerstorfi 50.5 0.70 4.59 C. wuellerstorfi 52.5 0.74 4.57 C. wuellerstorfi 52.5 0.54 4.36 C. wuellerstorfi 56.5 0.62 4.69 C. wuellerstorfi 56.5 0.93 4.61 C. wuellerstorfi 58.5 0.80 4.42 C. wuellerstorfi 60.5 0.78 4.61 C. wuellerstorfi 60.5 0.65 4.56 C. wuellerstorfi 64.5 0.47 4.40 C. wuellerstorfi 64.5 0.43 4.37 C. wuellerstorfi 66.50 0.75 4.46 C. wuellerstorfi 66.50 0.22 4.43 C. wuellerstorfi 68.50 0.34 4.41 C. wuellerstorfi 70.50 0.61 4.35 C. wuellerstorfi 70.50 0.73 4.39 C. wuellerstorfi