noaa-cave-21550 Tamboril Cave, Brazil 2000 Year Strontium and Oxygen Isotope Data Wortham, B.E.; Wong, C.I.; Silva, L.C.R.; McGee, D.; Montañez, I.P.; Rasbury, E.T.; Cooper, K.M.; Sharp, W.D.; Glessner, J.J.G.; Santos, R.V. Tamboril Cave, Brazil 2000 Year Strontium and Oxygen Isotope Data 2017-02-27 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21550 Investigator B.E. Wortham Investigator C.I. Wong Investigator L.C.R. Silva Investigator D. McGee Investigator I.P. Montañez Investigator E.T. Rasbury Investigator K.M. Cooper Investigator W.D. Sharp Investigator J.J.G. Glessner Investigator R.V. Santos earth science paleoclimate speleothems 87Sr/86Sr,calcium carbonate,null,dimensionless,null,speleothems,raw,thermal ionization mass spectrometry,N,null earth science paleoclimate speleothems age,null,null,calendar year before present,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems 87Sr/86Sr,calcium carbonate,null,dimensionless,null,speleothems,raw,multiple collector inductively-coupled plasma mass spectrometry,N,null earth science paleoclimate speleothems notes,null,null,null,null,speleothems,null,null,C,laboratory name earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,depth from top earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems other earth science paleoclimate speleothems oxygen isotopes geoscientificInformation Monsoon 2000 cal yr BP -32 cal yr BP Complete -16.364 -16.364 -46.904 -46.904 Continent South America Brazil Minas Gerais Tamboril Cave>LATITUDE -16.364>LONGITUDE -46.904 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Barbara E. Wortham, Corinne I. Wong, Lucas C.R. Silva, David McGee, Isabel P. Montanez, E. Troy Rasbury, Kari M. Cooper, Warren D. Sharp, Justin J.G. Glessner, Roberto V. Santos 2017 Earth and Planetary Science Letters 463 10.1016/j.epsl.2017.01.034 http://www.sciencedirect.com/science/article/pii/S0012821X17300468

Delineating the controls on hydroclimate throughout Brazil is essential to assessing potential impact of global climate change on water resources and biogeography. An increasing number of monsoon reconstructions from d18O records provide insight into variations in regional monsoon intensity over the last millennium. The strength, however, of d18O as a proxy of regional climate limits its ability to reflect local conditions, highlighting the need for comparable reconstructions of local moisture conditions. Here, speleothem 87Sr/86Sr values are developed as a paleo-moisture proxy in central Brazil to complement existing d18O-based reconstructions of regional monsoon intensity. Speleothem 87Sr/86Sr values are resolved using laser ablation and conventional solution mass spectrometry at high resolution relative to existing (non-d18O-based) paleo-moisture reconstructions to allow comparisons of centennial variability in paleo-monsoon intensity and paleo-moisture conditions. Variations in speleothem 87Sr/86Sr values from Tamboril Cave are interpreted to reflect varying extents of water interaction with the carbonate host rock, with more interaction resulting in greater evolution of water isotope values from those initially acquired from the soil to those of the carbonate bedrock. Increasing speleothem 87Sr/86Sr values over the last millennium suggest progressively less interaction with the carbonate host rock likely resulting from higher infiltration rates, expected under wetter conditions. Increasingly wetter conditions over the last millennium are consistent with an overall trend of increasing monsoon intensity (decreasing d18O values) preserved in many existing d18O records from the region. Such a trend, however, is absent in d18O records from our site (central Brazil) and Cristal Cave (southeast Brazil), suggesting the existence of divergent (relevant to d18Oprecip) shifts in the climate patterns within and outside the core monsoon region. STUDY NOTES: Oxygen (d18O), Carbon (d13C), and Strontium (87Sr/86Sr) isotope data from speleothems collected in Tamboril Cave, central Brazil, for the past 2,000 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/tamboril2017d18o.txt Formatted Text Data File; Tamboril Cave d18O and d13C GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/tamboril2017sr.txt Formatted Text Data File; Tamboril Cave 87Sr/86Sr USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11