# Buraca Gloriosa Cave d13C and d18O and Model Output Data from 800 - 2013 CE #----------------------------------------------------------------------- # 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/37160 # 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-cave-37160.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Speleothems # # Dataset_DOI: 10.25921/pg3x-tp22 # # Science_Keywords: #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/speleothem/europe/portugal/thatcher2022/thatcher2022-composite_isotope_records.txt # Data_Download_Description: NOAA Template File; Composite Isotope Records Data # #--------------------------------------- # Contribution_Date # Date: 2022-12-22 #--------------------------------------- # File_Last_Modified_Date # Date: 2025-06-23 #--------------------------------------- # Title # Study_Name: Buraca Gloriosa Cave d13C and d18O and Model Output Data from 800 - 2013 CE #--------------------------------------- # Investigators # Investigators: Thatcher, Diana #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Stalagmite, Azores High, Hydroclimate, Last millennium, Last MillenniumEnsemble, Paleoclimate #--------------------------------------- # Publication # Authors: D.L. Thatcher, A.D. Wanamaker, R.F. Denniston, C.C. Ummenhofer, Y. Asmerom, V.J. Polyak, N. Cresswell-Clay, F. Hasiuk, J. Haws, D.P. Gillikin # Published_Date_or_Year: 2023-04-01 # Published_Title: Iberian hydroclimate variability and the Azores High during the last 1200 years: Evidence from proxy records and climate model simulations # Journal_Name: Climate Dynamics # Volume: 60 # Edition: # Issue: 7-8 # Pages: 2365–2387 # Report_Number: # DOI: 10.1007/s00382-022-06427-6 # Online_Resource: # Full_Citation: # Abstract: The state of the atmospheric circulation and the associated hydroclimate in the North Atlantic during the last millennium remain the subject of considerable debate in both proxy- and model-based studies. Of particular interest in the Iberian region is the Azores High (AH) system, the southern node of the North Atlantic Oscillation (NAO), an atmospheric dipole closely tied to regional hydroclimate. Hydroclimate-sensitive proxy reconstructions from this region offer some insights into atmospheric dynamics, but large spatiotemporal gaps in these data inhibit a robust evaluation of hydroclimate variability. In this study, we present a continuous, sub-decadally-resolved composite stalagmite carbon isotopic record from three partially overlapping stalagmites from Buraca Gloriosa (BG) cave, western Portugal, situated within the center of the AH, that preserves evidence of regional hydroclimate variability from approximately 800 CE to the present. Chronologies are derived from U/Th dating and annual laminae. Stalagmite carbon isotopic values primarily reflect the amount of effective moisture and reveal generally dry conditions during the Medieval Climate Anomaly (MCA; ~ 850–1250 CE) and Modern Climate/Industrial Era (1850 CE-present), and wetter conditions during the Little Ice Age (LIA; ~ 1400–1850 CE). Multidecadal to centennial variability in the BG record and state-of-the-art last millennium climate model simulations show considerable coherence with precipitation-sensitive records from Spain and Morocco that, like BG, are strongly influenced by the intensity, size, and location of the AH. Model-proxy synthesis suggests that western Portugal was persistently dry during much of the MCA consistent with other NAO reconstructions; however, even considering age uncertainties, the apparent timing in the transition from a relatively dry MCA to a wetter LIA is spatially variable and confirms the non-stationary behavior of the AH system indicated by model output. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 1804528, 1804132, 1806025, 1805163, BCS-0455145, BCS-0612923, BCS-1118155, 1804635 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Center for Global and Regional Environmental Research # Grant: #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Ocean Climate Change Institute # Grant: #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Woods Hole Oceanographic Institution # Grant: James E. and Barbara V. Moltz Fellowship #--------------------------------------- # Site_Information # Site_Name: Buraca Gloriosa Cave # Location: Portugal # Northernmost_Latitude: 39.53 # Southernmost_Latitude: 39.53 # Easternmost_Longitude: -8.78 # Westernmost_Longitude: -8.78 # Elevation_m: 420 #--------------------------------------- # Data_Collection # Collection_Name: Composite_Isotope_Records # First_Year: 800 # Last_Year: 2013 # Time_Unit: CE # Core_Length_m: # Parameter_Keywords: oxygen isotopes, carbon isotopes # Notes: Composite record from three stalagmites from Buraca Gloriosa cave (BG131, BG134 and BG136) #--------------------------------------- # 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) # ## age_CE age,,,year Common Era,,speleothems,,,N, ## d13C_comp delta 13C,calcite,,per mil VPDB,,speleothems,composited,isotope ratio mass spectrometry,N,Composite d13C Record from Buraca Gloriosa (BG) ## d18O_comp delta 18O,calcite,,per mil VPDB,,speleothems,composited,isotope ratio mass spectrometry,N,Composite d18O Record from Buraca Gloriosa (BG) ## d13C_compZ delta 13C,calcite,,standard deviation unit,,speleothems,composited,,N,Composite d13C Z-scores ## d13C_compSuess delta 13C,calcite,,per mil VPDB,,speleothems,composited;corrected,isotope ratio mass spectrometry,N,Composite Suess-corrected d13C #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # 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