# 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/boavista2019tbv63d18o.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: BoaVista2019TBV63 # Earliest_Year: 39668 # Most_Recent_Year: 39115 # 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 39115 226 -5.58 39117 224 -5.33 39120 222 -4.85 39123 221 -5.12 39126 219 -5.07 39128 217 -5.24 39131 215 -5.3 39134 213 -4.76 39137 211 -4.44 39140 210 -7.46 39142 208 -5.55 39145 206 -6.3 39148 204 -6.57 39151 202 -6.73 39154 200 -6.34 39156 198 -7.12 39159 197 -6.6 39162 195 39165 193 -5.08 39168 191 -4.5 39170 189 -4.52 39173 188 -5.06 39176 186 -6.86 39179 184 -7.03 39182 182 -6.29 39184 180 -6.33 39187 178 -7.74 39190 176 -7.51 39193 174 -7.26 39196 172 -7.63 39198 170 -7.16 39201 168 -5.93 39204 167 -6.41 39207 165 -5.74 39210 164 -6.1 39212 161 -5.76 39214 158 -5.52 39217 157 -5.64 39220 156 -5.74 39224 155 -6.56 39225 154 -6.23 39226 153 -5.89 39228 152 -5.94 39229 151 -5.69 39230 149 -5.94 39232 148 -6.34 39233 147 -6.96 39234 146 -7.55 39236 145 -7.38 39237 145 -6.62 39239 144 -6.54 39240 143 -7.2 39242 143 -6.72 39243 142 -5.88 39245 142 -5.98 39247 141 -6.95 39249 140 -7.41 39250 138 39251 137 -7.81 39252 135 -7.47 39253 134 -6.47 39254 133 -5.85 39255 132 39257 132 -5.52 39258 131 -5.35 39260 130 -5.38 39261 130 -6.43 39263 130 -6.1 39264 129 -5.72 39266 129 -5.95 39267 128 -6.6 39269 127 -6.94 39270 127 -7.12 39272 126 -7.3 39273 125 -7.48 39275 125 -6.54 39277 123 -6.7 39280 121 -7.88 39283 120 -7.43 39286 118 -7.45 39289 116 -7.93 39291 115 -7.88 39294 114 -8.29 39297 112 -7.44 39300 111 -6.56 39303 109 -7.11 39306 108 -7.25 39308 106 -7.37 39311 105 -7.28 39314 103 -7.96 39317 102 -8.36 39320 100 -8.14 39323 99 -6.93 39326 97 -6.17 39329 96 -6.94 39332 94 -7.13 39335 93 -7.86 39338 92 -8.24 39340 90 -6.93 39343 89 -6.37 39346 88 -6.49 39349 87 -7.28 39352 85 -7.92 39355 84 -7.73 39358 83 -7.53 39361 82 -7.75 39364 80 -6.86 39367 79 -6.97 39370 78 -6.95 39373 77 -6.43 39376 76 -6.65 39379 75 -7.77 39381 74 -7.97 39384 73 -7.02 39387 72 -6.87 39390 71 -7.23 39393 70 -7.4 39396 69 -6.78 39399 69 -5.79 39401 68 -5.41 39404 68 -5.39 39407 67 -5.62 39409 66 -5.69 39412 66 -5.83 39415 66 -6.13 39418 65 -6.51 39420 65 -7.41 39423 64 -7.86 39426 64 -7.72 39428 64 -7.36 39431 64 -6.72 39434 63 -6.42 39436 63 -5.85 39439 63 -6.3 39442 63 -6.97 39444 63 -7.78 39447 63 -7.56 39450 63 -7.27 39452 63 -7.33 39455 63 -6.8 39459 63 -6.52 39462 64 -6.13 39464 64 -6.93 39466 64 -8.1 39469 65 -8.26 39472 65 -8.15 39474 66 -7.69 39477 66 -8.24 39480 67 -7.88 39483 67 -7.2 39485 68 -6.85 39488 68 -6.67 39491 69 -6.81 39493 70 -6.91 39496 70 -6.34 39499 71 -6.01 39501 72 -5.98 39504 73 -6.3 39507 73 -7.36 39509 74 -6.89 39512 75 -7.26 39515 76 -6.98 39518 77 -6.94 39521 79 -7.07 39523 80 -7.75 39526 81 -8.24 39529 82 -8.47 39532 83 -7.43 39534 84 -7.59 39537 86 -7.62 39540 87 -7.64 39543 88 -7.78 39545 90 -8.35 39548 91 -7.43 39551 92 -7.65 39560 90 -7.92 39572 89 -7.34 39579 90 -6.24 39584 92 -5.38 39590 94 -4.89 39596 96 -3.94 39601 98 -3.08 39607 100 -2.73 39613 104 -2.62 39618 107 -3.44 39624 111 -3.98 39630 114 -3.43 39636 118 -2.91 39642 123 -2.57 39648 127 -2.82 39654 132 -2.78 39661 145 -3.25 39668 157 -3.93