Cruz et al. 2005 Botuvera Cave, Brazil Stalagmite Stable Isotope Data Cruz, J.W.; Burns, S.J.; Karmann, I.; Sharp, W.D.; Vuille, M.; Cardoso, A.O.; Ferrari, J.A.; Silva Dias, P.L.; Viana, O. Cruz, J.W. Burns, S.J. Karmann, I. Sharp, W.D. Vuille, M. Cardoso, A.O. Ferrari, J.A. Silva Dias, P.L. Viana, O. Dansgaard-Oeschger cycles PAGES 2k Network PAGES LOTRED SA2k millennial resolution earth science/paleoclimate/speleothems (depth,null,null,millimeter,null,speleothems,null,null,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 (delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Botuverá Cave>LATITUDE -27.22>LONGITUDE -49.16) During the last glacial period, large millennial-scale temperature oscillation-the 'Dansgaard/Oeschger' cycles-were the primary climate signal in Northern Hemisphere climate archives from the high latitudes to the tropics. But whether the influence of these abrupt climate changes extended to the tropical and subtropical Southern Hemisphere, where changes in insolation are thought to be the main direct forcing of climate, has remained unclear. Here we present a high-resolution oxygen isotope record of a U/Th-dated stalagmite from subtropical southern Brazil, covering the past 116,200 years. The oxygen isotope signature varies with shifts in the source region and amount of rainfall in the area, and hence records changes in atmospheric circulation and convective intensity over South America. We find that these variations in rainfall source and amount are primarily driven by summer solar radiation, which is controlled by the Earth's precessional cycle. The Dansgaard/ Oeschger cycles can be detected in our record and therefore we confirm that they also affect the tropical hydrological cycle, but that in southern subtropical Brazil, millennial-scale climate changes are not as dominant as they are in the Northern Hemisphere. STUDY NOTES: DESCRIPTION: Bt2 stalagmite is a continuous record of paleoclimate changes over subtropical Brazil for the last 116,00 years. The oxygen stable isotope (per mil VPDB) data set has a resolution of ~150 years and its age model is based on 20 U/Th ages. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Cruz, J.W. Investigator : Burns, S.J. Investigator : Karmann, I. Investigator : Sharp, W.D. Investigator : Vuille, M. Investigator : Cardoso, A.O. Investigator : Ferrari, J.A. Investigator : Silva Dias, P.L. Investigator : Viana, O. 2005-03-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5431 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/botuvera2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/botuvera2005.txt English https://www.ncdc.noaa.gov/paleo/study/5431 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/botuvera2005.txt Cruz, F.W., Jr., S.J. Burns, I. Karmann, W.D. Sharp, M. Vuille, A.O. Cardoso, J.A. Ferrari, P.L. Silva Dias, and O. Viana, Jr. 2005. Insolation-driven changes in atmospheric circulation over the past 116,000 years in subtropical Brazil. Nature, 434, No. 7029, 63-66 START YEAR: -114210 AD * END YEAR: 1950 AD -49.16 -27.22 -49.16 -27.22