# Equatorial Pacific d11B, Mg/Ca, and pCO2 Data and pH and SST Reconstructions during the Pliocene #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # 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, 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.ncdc.noaa.gov/paleo/study/33252 # 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-33252.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/ampv-j413 # # Science_Keywords: #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/shankle2021/shankle2021-odp846.txt # Data_Download_Description: NOAA Template File; ODP846_MgCa_SST_d11B_pH Shankle2021 Data # #--------------------------------------- # Contribution_Date # Date: 2021-07-23 #--------------------------------------- # File_Last_Modified_Date # Date: 2021-07-23 #--------------------------------------- # Title # Study_Name: Equatorial Pacific d11B, Mg/Ca, and pCO2 Data and pH and SST Reconstructions during the Pliocene #--------------------------------------- # Investigators # Investigators: Shankle, Madison G.(https://orcid.org/0000-0002-8052-9136); Burls, Natalie B.; Fedorov, Alexey V.; Thomas, Matthew D.; Liu, W.; Penman, Donald E.; Ford, Heather L.; Jacobs, Peter; Planavsky, Noah J.; Hull, Pincelli M. #--------------------------------------- # Description_Notes_and_Keywords # Description: Reconstructed pH (from delta 11B) and sea surface temperatures (from magnesium/calcium) for data from the western equatorial Pacific (ODP806) from ~0-6Ma. The depths and ages for site ODP 806 are derived from the age model published in Zhang et al. (2017). [https://doi.org/10.1016/j.epsl.2017.03.016]. The depths and ages for site ODP 846 are derived from the age model published in Lisiecki & Raymo (2005). [https://doi.org/10.1029/2004PA001071]. # Provided Keywords: Pliocene, upwelling, pH, sea surface temperatures, equatorial Pacific, delta 11B #--------------------------------------- # Publication # Authors: Shankle, M.G.; Burls, N.B.; Fedorov, A.V.; Thomas, M.D.; Liu, W.; Penman, D.E.; Ford, H.L.; Jacobs, P.; Planavsky, N.J.; Hull, P.M. # Published_Date_or_Year: 2021-10-21 # Published_Title: Decoupling of temperature and pH gradients along the equatorial Pacific during the Pliocene # Journal_Name: Nature # Volume: 598 # Edition: # Issue: # Pages: 457-461 # Report_Number: # DOI: 10.1038/s41586-021-03884-7 # Online_Resource: # Full_Citation: # Abstract: Ocean dynamics in the equatorial Pacific drive tropical climate patterns that affect marine and terrestrial ecosystems worldwide. How this region will respond to global warming has profound implications for global climate, economic stability and ecosystem health. As a result, numerous studies have investigated equatorial Pacific dynamics during the Pliocene (5.3–2.6 million years ago) and late Miocene (around 6 million years ago) as an analogue for the future behaviour of the region under global warming. Palaeoceanographic records from this time present an apparent paradox with proxy evidence of a reduced east–west sea surface temperature gradient along the equatorial Pacific—indicative of reduced wind-driven upwelling—conflicting with evidence of enhanced biological productivity in the east Pacific that typically results from stronger upwelling. Here we reconcile these observations by providing new evidence for a radically different-from-modern circulation regime in the early Pliocene/late Miocene that results in older, more acidic and more nutrient-rich water reaching the equatorial Pacific. These results provide a mechanism for enhanced productivity in the early Pliocene/late Miocene east Pacific even in the presence of weaker wind-driven upwelling. Our findings shed new light on equatorial Pacific dynamics and help to constrain the potential changes they will undergo in the near future, given that the Earth is expected to reach Pliocene-like levels of warming in the next century. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: 1602557, 170251,1844380 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Alfred P. Sloan Foundation # Grant: Sloan Ocean Fellowship #--------------------------------------- # Funding_Agency # Funding_Agency_Name: John Simon Guggenheim Memorial Foundation # Grant: Guggenheim Fellowship #--------------------------------------- # Funding_Agency # Funding_Agency_Name: ARCHANGE Project, France # Grant: ANR-18-MPGA-0001 #--------------------------------------- # Site_Information # Site_Name: ODP 846 # Location: Eastern Pacific Ocean # Northernmost_Latitude: -3.095 # Southernmost_Latitude: -3.095 # Easternmost_Longitude: -90.8183 # Westernmost_Longitude: -90.8183 # Elevation_m: -3296 #--------------------------------------- # Data_Collection # Collection_Name: ODP846_MgCa_SST_d11B_pH Shankle2021 # First_Year: 6.077 # Last_Year: 0.8 # Time_Unit: Ma # Core_Length_m: 178.77 # Parameter_Keywords: trace metals in carbonates, geochemistry, reconstruction # Notes: Data from Holes B, C, and D at site 846. The depths and ages for site ODP 846 are derived from the age model published in Lisiecki & Raymo (2005). [https://doi.org/10.1029/2004PA001071]. #--------------------------------------- # Chronology_Information # Chronology: # The depths and ages on the "Data" tab are derived from the age model for site ODP846 published in Lisiecki & Raymo (2005). [Lisiecki, L. E. & Raymo, M. E. A Pliocene-Pleistocene stack of 57 globally distributed benthic d18O records. Paleoceanography 20, (2005).] #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncdc.noaa.gov/paleo/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) # ## depth_top depth at sample end,,,meter,,Climate Reconstructions; Paleoceanography,,,N,meters below sea floor ## depth_bott depth at sample start,,,meter,,Climate Reconstructions; Paleoceanography,,,N,meters below sea floor ## hole sample identification,,,,,Climate Reconstructions; Paleoceanography,,,C,Site hole ## age_Ma age,,,million years ago,,Climate Reconstructions; Paleoceanography,,,N,Age model reference: Lisiecki and Raymo (2005) ## sample_ID sample identification,,,,,Climate Reconstructions; Paleoceanography,,,C, ## Mg/Ca magnesium/calcium,Orbulina universa,,millimole per mole,,Paleoceanography,,inductively-coupled plasma mass spectrometry,N, ## SST sea surface temperature,magnesium/calcium,,degree Celsius,,Climate Reconstructions; Paleoceanography,,regression analysis,N,O. universa-specific calibration in Anand et al.(2003) using the Mg/Ca_seawater record of Fantle and DePaolo(2006) ## d11B delta 11B,Orbulina universa,,per mil SRM 951,,Paleoceanography,,multiple collector inductively-coupled plasma mass spectrometry,N, ## d11B_2sd delta 11B,Orbulina universa,two standard deviations,per mil SRM 951,,Paleoceanography,,multiple collector inductively-coupled plasma mass spectrometry,N, ## pH pH,delta 11B,,dimensionless,,Climate Reconstructions; Paleoceanography,,Monte Carlo simulation,N,O. universa-specific calibration of Henehan et al.(2016); in Monte Carlo simulation provided by Rae (2018) in Boron Isotopes ## pH_2sd pH,delta 11B,two standard deviations,dimensionless,,Climate Reconstructions; Paleoceanography,,Monte Carlo simulation,N, ## LSR sedimentation rate,,,centimeter per kiloyear,,Paleoceanography,,,N,Estimated linear sedimentation rate using the original age model for the site (see reference in Chronology tab) from the depths and ages of the two samples bracketing a given sample ## LSR_Time-span notes,,,calendar kiloyear,,Paleoceanography,,,N,LSR-determined time span of sample; Calculated from the thickness of the sample (depth_end-depth_start) (in cm) multiplied by the estimated LSR #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 depth_top depth_bott hole age_Ma sample_ID Mg/Ca SST d11B d11B_2sd pH pH_2sd LSR LSR_Time-span 27.80 27.82 B 0.800 MS43 4.252 22.9 16.89 0.25 8.09 0.053 2.97 5.94 32.41 32.43 D 0.952 MS42 3.423 20.6 16.78 0.25 8.10 0.054 3.75 7.49 34.32 34.64 D 1.003 MS41 3.369 20.6 16.68 0.26 8.09 0.055 2.16 69.16 36.18 36.20 D 1.048 MS40 3.829 22.0 16.34 0.24 8.04 0.054 4.92 9.84 93.82 93.84 C 2.700 MS53 4.245 24.3 14.78 0.24 7.83 0.057 6.48 12.96 96.87 97.21 C 2.856 MS64 5.109 26.9 15.82 0.25 7.93 0.054 5.88 200.06 98.30 98.32 C 2.900 MS54 4.314 25.2 15.10 0.24 7.86 0.056 5.12 10.25 102.23 102.25 C 3.000 MS59 3.647 23.8 14.74 0.24 7.83 0.057 4.00 7.99 195.92 197.95 D 5.844 MS49 4.006 27.1 15.12 0.24 7.84 0.056 3.83 778.55 198.25 198.58 D 5.873 MS50 3.905 27.0 15.73 0.24 7.92 0.054 3.50 115.50 199.19 200.15 D 5.907 MS48 3.924 27.5 15.35 0.23 7.87 0.055 4.00 384.00 206.55 206.57 B 6.077 MS47 3.677 27.8 15.46 0.28 7.88 0.057 5.75 11.50