noaa-cave-25990 Northeast Brazil Heinrich Stadial 4 Speleothem d18O Data Wendt, K.A.; Häuselmann, A.D.; Fleitmann, D.; Berry, A.E.; Wang, X.; Auler, A.S.; Cheng, H.; Edwards, R.L. Northeast Brazil Heinrich Stadial 4 Speleothem d18O Data 2019-01-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25990 Investigator K.A. Wendt Investigator A.D. Häuselmann Investigator D. Fleitmann Investigator A.E. Berry Investigator X. Wang Investigator A.S. Auler Investigator H. Cheng Investigator R.L. Edwards earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 40058 cal yr BP 38379 cal yr BP Complete -10.1602 -10.1602 -40.8605 -40.8605 600 600 Continent South America Brazil Toca da Barriguda>LATITUDE -10.1602>LONGITUDE -40.8605 Continent South America Brazil Toca da BoaVista>LATITUDE -10.1602>LONGITUDE -40.8605 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Kathleen A. Wendt, Anamaria D. Häuselmann, Dominik Fleitmann, Akemi E. Berry, Xianfeng Wang, Augusto S. Auler, Hai Cheng, R. Lawrence Edwards 2019 Earth and Planetary Science Letters 510 94-102 10.1016/j.epsl.2018.12.025 https://www.sciencedirect.com/science/article/pii/S0012821X18307404

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. STUDY NOTES: 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)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/boavista2019tbv40d18o.txt NOAA Template File; Toca da BoaVista Stalagmite TBV40 d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/boavista2019tbv63d18o.txt NOAA Template File; Toca da BoaVista Stalagmite TBV63 d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/barriguda2019tbr14d18o.txt NOAA Template File; Toca da Barriguda Stalagmite TBR14 d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/CFLM_images.zip ZipFile; Northeast Brazil Stalagmite CFLM Images USA/NOAA DIF Version 9.8.4 2019-02-01 2019-02-01