# 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-s2-ctd-cdw.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: oxygen isotopes, carbon isotopes, geochemistry #--------------------------------------- # Contribution_Date # Date: 2018-08-31 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-08-31 #--------------------------------------- # 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: Demerara Rise # Location: North Atlantic Ocean # Country: # Northernmost_Latitude: 8.7 # Southernmost_Latitude: 8.3 # Easternmost_Longitude: -52.9 # Westernmost_Longitude: -53.1 # Elevation: #--------------------------------------- # Data_Collection # Collection_Name: Demerara Rise CdW S2 Oppo2018 # First_Year: # Last_Year: # Time_Unit: # Core_Length: # Notes: Demerara Rise CdW measurements from water collected on CTD Rosette #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # 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) ## core sample identification,,,,,paleoceanography,,,C, ## lat latitude,,,degree north,,paleoceanography,,,N, ## lon longitude,,,degree east,,paleoceanography,,,N, ## bott_depth notes,,,meter,,paleoceanography,,,N,water bottom depth at core location ## samp_depth collection water depth,,,meter,,paleoceanography,,,N,Water sample Depth (m) ## salinity salinity,,,practical salinity unit,,instrumental,,,N, ## CdW cadmium,sea water,,nanomole per kilogram,,instrumental,,,N, ## CdW_2sd cadmium,sea water,two standard deviations,nanomole per kilogram,,instrumental,,,N,measurement uncertainty #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA core lat lon bott_depth samp_depth salinity CdW CdW_2sd 64CTD-1 8.3 -53.1 1720 50 36.21 0.021 0.001 64CTD-2 8.3 -53.1 1720 200 35.45 0.165 0.010 64CTD-3 8.3 -53.1 1720 350 34.89 0.420 0.025 64CTD-4 8.3 -53.1 1720 500 34.70 0.480 0.029 64CTD-5 8.3 -53.1 1720 650 34.64 0.618 0.037 64CTD-6 8.3 -53.1 1720 800 34.54 0.661 0.040 64CTD-7 8.3 -53.1 1720 950 34.58 0.600 0.036 64CTD-8 8.3 -53.1 1720 1100 34.70 0.590 0.035 64CTD-9 8.3 -53.1 1720 1250 34.86 0.507 0.030 64CTD-10 8.3 -53.1 1720 1400 35.00 0.344 0.021 3CTD-5 8.7 -52.9 4684 1600 35.00 0.306 0.018 3CTD-6 8.7 -52.9 4684 2000 34.97 0.285 0.017 3CTD-7 8.7 -52.9 4684 2400 34.95 0.307 0.018 3CTD-8 8.7 -52.9 4684 2800 34.93 0.315 0.019 3CTD-9 8.7 -52.9 4684 3200 34.91 0.325 0.020 3CTD-10 8.7 -52.9 4684 3600 34.89 0.332 0.020 3CTD-11 8.7 -52.9 4684 4000 34.88 0.345 0.021 3CTD-12 8.7 -52.9 4684 4345 34.88 0.373 0.022 3CTD-13 8.7 -52.9 4684 4670 34.84 0.453 0.027