# Paleo-pCO2 Database: Western Equatorial Pacific Atmospheric CO2 estimates derived from foraminiferal d11B Over the Past 15.69 Ma #----------------------------------------------------------------------- # 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/38360 # 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-forcing-38360.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Climate Forcing # # Dataset_DOI: # # Science_Keywords: Atmospheric Gas Reconstruction, carbon cycle #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/boron_isotopes_guillermic_2022.txt # Data_Download_Description: NOAA Template File; Metadata Only # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/boron_isotopes_guillermic_2022.xlsx # Data_Download_Description: Excel File; CO2 Data # #--------------------------------------- # Contribution_Date # Date: 2023-07-28 #--------------------------------------- # File_Last_Modified_Date # Date: 2023-08-09 #--------------------------------------- # Title # Study_Name: Paleo-pCO2 Database: Western Equatorial Pacific Atmospheric CO2 estimates derived from foraminiferal d11B Over the Past 15.69 Ma #--------------------------------------- # Investigators # Investigators: Guillermic, Maxence; Misra, Sambuddha; Eagle, Robert; Tripati, Aradhna #--------------------------------------- # Description_Notes_and_Keywords # Description: Data can be found at: https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/boron_isotopes_guillermic_2022.xlsx #--------------------------------------- # Publication # Authors: Guillermic, M., Misra, S., Eagle, R., & Tripati, A. # Published_Date_or_Year: 2022 # Published_Title: Atmospheric CO2 estimates for the Miocene to Pleistocene based on foraminiferal d11B at Ocean Drilling Program Sites 806 and 807 in the Western Equatorial Pacific # Journal_Name: Climate of the Past # Volume: 18 # Edition: # Issue: # Pages: 183-207 # Report_Number: # DOI: 10.5194/cp-18-183-2022 # Online_Resource: # Full_Citation: # Abstract: Constraints on the evolution of atmospheric CO2 levels throughout Earth's history are foundational to our understanding of past variations in climate. Despite considerable effort, records vary in their temporal and spatial coverage and estimates of past CO2 levels do not always converge, and therefore new records and proxies are valuable. Here we reconstruct atmospheric CO2 values across major climate transitions over the past 16 million years using the boron isotopic composition (d11B) of planktic foraminifera from 89 samples obtained from two sites in the West Pacific Warm Pool, Ocean Drilling Program (ODP) Sites 806 and 807, measured using high-precision multi-collector inductively coupled plasma mass spectrometry. We compare our results to published data from ODP Site 872, also in the Western Equatorial Pacific, that goes back to 22 million years ago. These sites are in a region that today is near equilibrium with the atmosphere and are thought to have been in equilibrium with the atmosphere for the interval studied. We show that d11B data from this region are consistent with other boron-based studies. The data show evidence for elevated pCO2 during the Middle Miocene and Early to Middle Pliocene, and reductions in pCO2 of ~200 ppm during the Middle Miocene Climate Transition, ~250 ppm during Pliocene Glacial Intensification and ~50 ppm during the Mid-Pleistocene Climate Transition. During the Mid-Pleistocene Transition there is a minimum pCO2 at marine isotopic stage (MIS) 30. Our results are consistent with a coupling between pCO2, temperature and ice sheet expansion from the Miocene to the late Quaternary. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Department of Energy Labor and Economic Growth # Grant: DE-FG02-13ER16402 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: International Research Chair Program # Grant: LabexMer ANR-10-LABX-19-01 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: International Association of GeoChemistry # Grant: #--------------------------------------- # Site_Information # Site_Name: Ontong Java Plateau # Location: Western Pacific Ocean # Northernmost_Latitude: 3.607 # Southernmost_Latitude: 0.3185 # Easternmost_Longitude: 156.6248 # Westernmost_Longitude: 159.3615 # Elevation_m: -2803.8 #--------------------------------------- # Data_Collection # Collection_Name: ODP 806 and 807 # First_Year: 15690000 # Last_Year: 900000 # Time_Unit: calendar year before present # Core_Length_m: # Parameter_Keywords: carbon dioxide # Notes: Isotopic ratio of boron (d11B) of the surface-dwelling foraminifera Globigerinoides sacculifer and Globigerinoides ruber #--------------------------------------- # 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: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: