# Northeast Brazil Heinrich Stadial 4 Speleothem d18O Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/25990 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/boavista2019tbv40d18o.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Speleothems # # Dataset DOI: # # Parameter_Keywords: oxygen isotopes #-------------------- # Contribution_Date # Date: 2019-01-23 #-------------------- # File_Last_Modified_Date # Date: 2019-01-23 #-------------------- # Title # Study_Name: Northeast Brazil Heinrich Stadial 4 Speleothem d18O Data #-------------------- # Investigators # Investigators: Wendt, K.A.; Häuselmann, A.D.; Fleitmann, D.; Berry, A.E.; Wang, X.; Auler, A.S.; Cheng, H.; Edwards, R.L. #-------------------- # Description_Notes_and_Keywords # Description: High-resolution speleothem oxygen isotope (d18O) data plus CFLM images from 3 stalagmites collected in 2 northeastern Brazil caves (Toca da BoaVista and Toca da Barriguda) over Heinrich Stadial 4 (~39ka). # Provided Keywords: Heinrich Stadial, ITCZ, speleothem, NE Brazil, pluvial phase, luminescent couplet #-------------------- # Publication # Authors: Kathleen A. Wendt, Anamaria D. Häuselmann, Dominik Fleitmann, Akemi E. Berry, Xianfeng Wang, Augusto S. Auler, Hai Cheng, R. Lawrence Edwards # Published_Date_or_Year: 2019-03-15 # Published_Title: Three-phased Heinrich Stadial 4 recorded in NE Brazil stalagmites # Journal_Name: Earth and Planetary Science Letters # Volume: 510 # Edition: # Issue: # Pages: 94-102 # Report_Number: # DOI: 10.1016/j.epsl.2018.12.025 # Online_Resource: https://www.sciencedirect.com/science/article/pii/S0012821X18307404 # Full_Citation: # Abstract: The growth intervals of stalagmites from Northeast (NE) Brazil provide precise information on the timing of pluvial periods associated with the southward shift of the Intertropical Convergence Zone (ITCZ) during Heinrich Stadials (HS). Using 230Th dating and annual band counting, we constrained the timing of the pluvial period associated with HS4 to occur between 40.06 ± 0.11 and 38.38 ± 0.10 thousand years before present (kyr B.P.), coinciding with the interval between the end of Greenland Interstadial (GIS)/Chinese Interstadial (CIS) 9 and GIS/CIS 8. Oxygen isotope analysis shows a close anti-correlation between NE Brazil wet periods and East Asian monsoon intensity recorded in Hulu Cave, supporting the hypothesis of a southerly migration of the global ITCZ during HS4. The pluvial anomaly can be divided into three phases, starting with a precursor, less intense pluvial interval (phase 1) between 40.06 ± 0.11 and kyr B.P., likely correlative to the cool phase of the North Atlantic immediately before the partial collapse of the Laurentide Ice Sheet (LIS). This phase ends abruptly (<30 yr) and is followed by an intense pluvial phase (phase 2) that spans approximately 5 centuries. Luminescent couplets are identified in all samples between 39.50 ± 0.10 and 39.41 ± 0.10 kyr B.P., and are interpreted as a period of two rainy seasons per year during which the southernmost extent of the inland West Atlantic ITCZ reached south of our study site (10 S). Following the end of phase 2 at 39.07 ± 0.32 kyr B.P., intermittent speleothem growth suggests intermittent rainfall over NE Brazil (phase 3) until the abrupt onset of GIS/CIS 8 at 38.38 ± 0.10 kyr B.P. The phases identified in NE Brazilian stalagmites agree with the three-phased variation in low-latitude proxies registered in Northern Greenland, and are consistent with changes in methane concentrations recorded in the West Antarctic Ice Sheet (WAIS) Divide. The synchronicity of these distant records suggests a multi-phased response of tropical atmospheric circulation during HS4. The timescales surrounding the LIS collapse, as inferred from our precisely dated stalagmites, are on the same order as recent predictions for the impending collapse of the WAIS and may therefore serve as a past analogue. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 1337693, 1702816, 1103403 #------------------ # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 41731174 #------------------ # Funding_Agency # Funding_Agency_Name: Singapore National Research Foundation Fellowship # Grant: NRFF2011-08 #------------------ # Site_Information # Site_Name: Toca da BoaVista (TBV) # Location: South America>Brazil # Country: Brazil # Northernmost_Latitude: -10.1602 # Southernmost_Latitude: -10.1602 # Easternmost_Longitude: -40.8605 # Westernmost_Longitude: -40.8605 # Elevation: 600 m #------------------ # Data_Collection # Collection_Name: BoaVista2019TBV40 # Earliest_Year: 40058 # Most_Recent_Year: 38379 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## age_calBP age, , , calendar years before present, , , , ,N, hiatus 38379-39105 yrBP ## age_calBPerr age error, , 2 sigma +/-, calendar years before present, , , , ,N, ## d18OcarbVPDB delta18O, calcium carbonate, , per mil VPDB, ,speleothems,,isotope ratio mass spectrometry,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_calBP age_calBPerr d18OcarbVPDB 38379 190 -4.95 39105 136 -4.97 39107 134 -5.38 39109 133 -5.1 39112 132 -5.18 39114 130 -5.5 39116 128 -6.24 39118 127 -5.42 39120 125 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