# Indo-Pacific Warm Pool Mid-Holocene Coral Sr/Ca SST Reconstructions #---------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #---------------------------------------------------- # 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 # # Data lines have no # # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/9819 # 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-coral-9819.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Corals and Sclerosponges # # Dataset_DOI: 10.25921/xbpj-ad63 # # Science_Keywords: Interglacial, Sea Surface Temperature Reconstruction, Warm Pool #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/coral/west_pacific/abram2009ipwp-sst-png-noaa.txt # Data_Download_Description: NOAA Template File; Papua New Guinea Sr/Ca Data and Sea Surface Temperature Reconstruction # #-------------------- # Contribution_Date # Date: 2010-11-16 #-------------------- # File_Last_Modified_Date # Date: 2025-07-22 #-------------------- # Title # Study_Name: Indo-Pacific Warm Pool Mid-Holocene Coral Sr/Ca SST Reconstructions #-------------------- # Investigators # Investigators: Abram, N.J.(https://orcid.org/0000-0003-1246-2344); McGregor, H.V.(https://orcid.org/0000-0002-4031-2282); Gagan, M.K.(https://orcid.org/0000-0002-8279-323X); Hantoro, W.S.; Suwargadi, B.W. #-------------------- # Description_Notes_and_Keywords # Description: Mid-Holocene sea surface temperature reconstructions for the Indo-Pacific Warm Pool region based on fossil coral Sr/Ca ratios. All coral ages are given in years before present (yBP) notation, where present is 1950 AD. Modern coral ages are absolute, based on drilling date and comparison with instrumental records, and are expressed in years before present notation for consistency with the fossil coral data. Fossil coral age determinations were made using calibrated radiocarbon measurements (2s age range) for the Mentawai corals and U/Th measurements for the Muschu/Koil corals (±2s error). 2 standard error on mean Sr/Ca determinations are derived from the average of yearly or composite resolution Sr/Ca measurements, or of the average of triplicate Sr/Ca measurements of bulk coral powders. The mean Sr/Ca values were converted to SST anomalies relative to the mean Sr/Ca value obtained from the modern corals for each locality using a mean Sr/Ca-SST dependence of -0.061 mmol mol-1 °C-1 (Abram et al. 2007, Correge et al. 2006). The error on the reconstructed SST anomaly is a combined error based on the standard error on the mean fossil Sr/Ca determinations and the standard deviation around the reconstruction of modern SST from the modern coral samples at each locality. #-------------------- # Publication # Authors: Abram, N.J., H.V. McGregor, M.K. Gagan, W.S. Hantoro, and B.W. Suwargadi # Journal_Name: Quaternary Science Reviews # Published_Title: Oscillations in the southern extent of the Indo-Pacific Warm Pool during the mid-Holocene # Published_Date_or_Year: 2009 # Volume: 28 # Issue: 25-26 # Pages: 2794-2803 # Report_Number: # DOI: 10.1016/j.quascirev.2009.07.006 # Full_Citation: # Abstract: The Indo-Pacific Warm Pool (IPWP) is thought to play a key role in the propagation and amplification of climate changes through its influence on the global distribution of heat and water vapour. However, little is known about past changes in the size and position of the IPWP. In this study, we use a total of 48 modern and fossil coral records from the Mentawai Islands (Sumatra, Indonesia) and Muschu/Koil Islands (Papua New Guinea) to reconstruct oscillations in the extent of the IPWP since the mid-Holocene. We show that reliable estimates of mean sea surface temperature (SST) can be obtained from fossil corals by using low-resolution Sr/Ca analysis of a suite of corals to overcome the large uncertainties associated with mean Sr/Ca-SST estimates from individual coral colonies. The coral records indicate that the southeastern and southwestern margins of the IPWP were cooler than at present between ~5500 and 4300 years BP (~1.2°C ± 0.3°C) and were similarly cool before ~6800 years BP. This mid-Holocene cooling was punctuated by an abrupt, short-lived shift to mean SSTs that were warmer than at present between ~6600 and 6300 years BP (~1.3°C ± 0.3°C), while similarly warm conditions may have also existed after ~4300 years BP. We suggest that mid-Holocene cooling at our study sites was related to contractions of the southeastern and southwestern margins of the IPWP, associated with the more northerly position of the Inter-tropical Convergence Zone (ITCZ) that accompanied mid-Holocene strengthening of the Asian summer monsoon. Conversely, intervals of abrupt warming appear to correspond with widespread episodes of monsoon weakening and accompanying southward migrations of the ITCZ that caused the IPWP to expand beyond our coral sites. Intervals of a strengthened Asian monsoon and cooling in the southwestern IPWP during the mid-Holocene appear to correspond with a more positive Indian Ocean Dipole (IOD)-like mean configuration across the tropical Indian Ocean, suggesting that the Asian monsoon-IOD interaction that exists at interannual time scales also persists over centennial to millennial scales. Associated mean changes in the Pacific ENSO modes may have also occurred during the mid-Holocene. The dynamic and inter-connected behaviour of the IPWP with tropical climate systems during the mid-Holocene highlights the fundamental importance of the warm pool region for understanding climate change throughout the tropics and beyond. #-------------------- # Funding_Agency # Funding_Agency_Name: Australian Research Council (ARC) # Grant: DP0663227 #-------------------- # Funding_Agency # Funding_Agency_Name: Australian Postgraduate Award # Grant: #-------------------- # Site_Information # Site_Name: Muschu and Koil Islands # Location: Papua New Guinea # Northernmost_Latitude: -3.34 # Southernmost_Latitude: -3.45 # Easternmost_Longitude: 144.22 # Westernmost_Longitude: 143.54 # Elevation_m: #-------------------- # Data_Collection # Collection_Name: abram2009 png # First_Year: 7550 # Last_Year: -40 # Time_Unit: cal yr BP # Core_Length_m: # Parameter_Keywords: SrCa # Notes: This is the data given in Table 1 of Abram et al., QSR (2009). #-------------------- # 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) # ## Coral_ID sample identification,,,,,corals and sclerosponges,,,C,Coral ID ## age_calBP age,,,calendar year before present,,climate reconstructions;corals and sclerosponges,,,N,U-Th age ## age_2s age,,two standard deviations,year,,climate reconstructions;corals and sclerosponges,,,N, ## Length number of samples,,,,,corals and sclerosponges,,,C, ## Resolution notes,,,,,corals and sclerosponges,,,C,sampling resolution ## Mean_Sr_Ca strontium/calcium,Porites sp.,,millimole per mole,,corals and sclerosponges,averaged,thermal ionization mass spectrometry,N, ## Sr_Ca_2SE strontium/calcium,Porites sp.,two standard error,millimole per mole,,corals and sclerosponges,averaged,thermal ionization mass spectrometry,N, ## SST_anom sea surface temperature,strontium/calcium,,degree Celsius,,climate reconstructions;corals and sclerosponges,anomalized,,N,anomalized to modern instrumental ## SST_err sea surface temperature,strontium/calcium,two standard deviations,degree Celsius,,climate reconstructions;corals and sclerosponges,anomalized,,N,anomalized to modern instrumental #-------------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: Coral_ID age_calBP age_2s Length Resolution Mean_Sr_Ca Sr_Ca_2SE SST_anom SST_err MS01 (modern) -40 NA 13 yearly 8.77 NA 0 NA MS04 (modern) -40 NA 13 yearly 8.72 NA 0.82 NA KL03 (modern) -40 NA 13 4-year composites 8.82 NA -0.82 NA FM09 2065 85 19 4-year composites 8.79 0.022 -0.32 1.68 FM22 5420 35 25 5-year composites 8.89 0.06 -1.96 1.91 FM07 5855 35 9 2-year composites 8.79 0.032 -0.32 1.72 FM21 5830 25 24 5-year composites 8.82 0.118 -0.81 2.55 FM15 6025 30 89 18-year composite 8.74 0.028 0.5 1.7 FM23 7030 35 18 4-year composites 8.85 0.042 -1.3 1.78 FM24 7215 35 18 4-year composites 8.79 0.032 -0.32 1.73 FK05 7550 35 33 7-year composites 8.97 0.098 -3.27 2.29