# 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.ncei.noaa.gov/access/paleo-search/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-odp806.txt # Data_Download_Description: NOAA Template File; ODP806_MgCa_SST_d11B_pH Shankle2021 Data # #--------------------------------------- # Contribution_Date # Date: 2021-07-23 #--------------------------------------- # File_Last_Modified_Date # Date: 2025-06-02 #--------------------------------------- # 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: US 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 806 # Location: Western Pacific Ocean # Northernmost_Latitude: 0.3185 # Southernmost_Latitude: 0.3185 # Easternmost_Longitude: 159.3617 # Westernmost_Longitude: 159.3617 # Elevation_m: -2520 #--------------------------------------- # Data_Collection # Collection_Name: ODP806_MgCa_SST_d11B_pH Shankle2021 # First_Year: 6000000 # Last_Year: 800000 # Time_Unit: cal yr BP # Core_Length_m: 160.57 # Parameter_Keywords: trace metals in carbonates, geochemistry, reconstruction # Notes: Data from Holes A, B, and C at site 806. The depths and ages for site ODP 806 are derived from the age model published in Zhang et al. (2017). [Zhang, Y. G., Pagani, M., Henderiks, J. & Ren, H. A long history of equatorial deep-water upwelling in the Pacific Ocean. Earth Planet. Sci. Lett. 467, 1–9 (2017).] #--------------------------------------- # Chronology_Information # Chronology: # The depths and ages on the "Data" tab are derived from the age model for site ODP806 published in Zhang et al. (2017). [Zhang, Y. G., Pagani, M., Henderiks, J. & Ren, H. A long history of equatorial deep-water upwelling in the Pacific Ocean. Earth Planet. Sci. Lett. 467, 1–9 (2017).] #--------------------------------------- # 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) # ## depth_top depth at sample end,,,meter,,Climate Reconstructions; Climate Forcing; Paleoceanography,,,N,meters below sea floor ## depth_bott depth at sample start,,,meter,,Climate Reconstructions; Climate Forcing; Paleoceanography,,,N,meters below sea floor ## hole sample identification,,,,,Climate Reconstructions; Climate Forcing; Paleoceanography,,,C,Site hole ## age_Ma age,,,million years ago,,Climate Reconstructions; Climate Forcing; Paleoceanography,,,N,Age model reference: Zhang (2017) ## sample_ID sample identification,,,,,Climate Reconstructions; Climate Forcing; 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 & 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, ## pCO2 carbon dioxide,bulk atmosphere; delta 11B,,parts per million,,Climate Forcing; Paleoceanography,,Monte Carlo simulation,N,partial pressure; pH ## pCO2_2sd carbon dioxide,bulk atmosphere; delta 11B,two standard deviations,parts per million,,Climate Forcing; Paleoceanography,,Monte Carlo simulation,N,partial pressure; pH ## 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 pCO2 pCO2_2sd LSR LSR_Time-span 8.36 8.38 A 0.800 MS63 5.109 24.9 17.73 0.24 8.14 0.052 316 45 2.24 4.47 11.59 11.61 A 0.900 MS62 5.722 26.3 17.71 0.24 8.12 0.052 330 47 2.24 4.47 14.81 14.83 A 1.000 MS61 5.521 26.0 17.82 0.23 8.13 0.051 318 45 2.24 4.47 17.40 17.44 B 1.100 MS60 5.804 26.8 17.43 0.27 8.09 0.053 361 53 2.24 8.95 69.85 69.87 C 2.700 MS55 4.488 24.9 16.55 0.24 8.03 0.053 432 64 2.63 5.26 72.68 72.70 A 2.800 MS56 4.709 25.7 16.10 0.24 7.97 0.054 504 75 2.76 5.51 76.61 76.63 C 2.900 MS57 4.893 26.6 17.30 0.24 8.08 0.052 372 53 3.20 6.40 79.83 79.85 C 3.000 MS58 3.928 24.6 16.57 0.24 8.03 0.053 426 63 3.49 6.97 169.95 169.97 B 5.800 MS45 -999 -999 16.40 0.24 8.02 0.053 442 66 2.87 5.73 171.62 171.64 B 5.852 MS52 3.793 26.6 16.88 0.24 8.04 0.052 415 60 3.07 6.15 172.92 173.45 B 5.899 MS46 3.966 28.7 16.73 0.23 8.00 0.052 461 66 3.35 177.67 176.41 176.43 B 6.000 MS51 4.607 30.0 17.03 0.26 8.02 0.052 440 64 3.97 7.94