# Benthic Foraminiferal Porosity and Isotope Data from the Arabian Sea over the Past 30,000 Years #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/38042 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-ocean-38042.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleoceanography # # Dataset_DOI: 10.25921/zwxy-5z84 # # Science_Keywords: #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/lu2023/lu2023-rc27-23_porosity.txt # Data_Download_Description: NOAA Template File; Porosity Data # #--------------------------------------- # Contribution_Date # Date: 2023-05-12 #--------------------------------------- # File_Last_Modified_Date # Date: 2023-07-05 #--------------------------------------- # Title # Study_Name: Benthic Foraminiferal Porosity and Isotope Data from the Arabian Sea over the Past 30,000 Years #--------------------------------------- # Investigators # Investigators: Lu, Wanyi #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Lu, W., Costa, K.M., Oppo, D.W. # Published_Date_or_Year: 2023-06-01 # Published_Title: Reconstructing the oxygen depth profile in the Arabian Sea during the last glacial period # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 38 # Edition: # Issue: 6 # Pages: # Report_Number: e2023PA004632 # DOI: 10.1029/2023PA004632 # Online_Resource: # Full_Citation: # Abstract: Reconstructing the strength and depth boundary of oxygen minimum zones (OMZs) in the glacial ocean advances our understanding of how OMZs respond to climate changes. While many efforts have inferred better oxygenation of the glacial Arabian Sea OMZ from qualitative indices, oxygenation and vertical extent of the glacial OMZ is not well quantified. Here we present glacial-Holocene oxygen reconstructions in a depth transect of Arabian Sea cores ranging from 600 to 3,650 m water depths. We estimate glacial oxygen concentrations using benthic foraminiferal surface porosity and benthic carbon isotope gradient reconstructions. Compared to the modern Arabian Sea, glacial oxygen concentrations were approximately 10–15 μmol/kg higher in the shallow OMZ (<1,000 m), and 5–80 μmol/kg lower at greater depths (1,500–3,650 m). Our results suggest that the OMZ in the glacial Arabian Sea was slightly better oxygenated but remained in the upper 1,000 m. We propose that the small increase in oxygenation of the Arabian Sea OMZ during the last glacial period was due to weaker upper ocean stratification induced by stronger winter monsoon winds coupled with an increase in oxygen solubility due to lower temperatures, counteracting the effects of more oxygen consumption resulting from higher primary productivity. Large-scale changes in ocean circulation may have also contributed to better ventilation of the glacial Arabian Sea OMZ. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site_Information # Site_Name: Core RC27-23 # Location: Arabian Sea # Northernmost_Latitude: 17.99 # Southernmost_Latitude: 17.99 # Easternmost_Longitude: 57.59 # Westernmost_Longitude: 57.59 # Elevation_m: -820 #--------------------------------------- # Data_Collection # Collection_Name: RC27-23_porosity # First_Year: 23500 # Last_Year: 1100 # Time_Unit: calendar year before present # Core_Length_m: # Parameter_Keywords: other # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## core sample identification,,,,,Paleoceanography,,,C, ## depth depth,,,centimeter,,Paleoceanography; climate reconstructions,,,N, ## age age,,,calendar kiloyear before present,,Paleoceanography; climate reconstructions,,,N, ## num_cibs number of samples,,,count,,Paleoceanography,,,N,Number of foraminifera specimen used for porosity analyses ## avg_porosity porosity,Cibicidoides sp.,,percent,,Paleoceanography,,,N,Cibicidoides spp. surface porosity in each sampling depth ## avg_porosity_sd porosity,Cibicidoides sp.,one standard deviation,percent,,Paleoceanography,,,N,standard deviation of Cibicidoides spp. surface porosity in each sampling depth ## BWO oxygen,sea water,,micromole per kilogram,,Paleoceanography; climate reconstructions,,,N,bottom water oxygen reconstructed from porosity #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA core depth age num_cibs avg_porosity avg_porosity_sd BWO RC27-23 15.5 1.1 1 34.8 NA 2.2 RC27-23 45.5 3.5 1 25.1 NA 12.5 RC27-23 60.5 4.6 6 26.6 5.9 10.7 RC27-23 75.5 5.9 6 31.2 7.5 5.7 RC27-23 90.5 7.2 6 30.3 9.5 6.6 RC27-23 105.5 8.6 6 22.3 3.2 16.2 RC27-23 119.5 10.0 6 22.5 4.6 15.9 RC27-23 135.5 10.8 6 18.0 4.3 22.8 RC27-23 149.5 11.5 6 19.3 2.5 20.7 RC27-23 166.5 13.3 6 18.7 5.5 21.7 RC27-23 179.5 14.5 5 23.8 7.0 14.2 RC27-23 195.5 14.8 7 19.4 6.3 20.6 RC27-23 210.5 16.4 7 19.8 3.5 19.9 RC27-23 223.5 17.9 7 21.0 5.2 18.0 RC27-23 241.5 20.1 4 23.5 7.6 14.5 RC27-23 270.5 23.5 3 24.9 8.7 12.7