noaa-cave-20433 Dante Cave, Namibia 550 Year Stalagmite Stable Isotope Data Voarintsoa, N.R.G.; Brook, G.A.; Liang, F.; Marais, E.; Hardt, B.F.; Cheng, H.; Edwards, R.L.; Railsback, L.B. Dante Cave, Namibia 550 Year Stalagmite Stable Isotope Data 2016-08-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20433 Investigator N.R.G. Voarintsoa Investigator G.A. Brook Investigator F. Liang Investigator E. Marais Investigator B.F. Hardt Investigator H. Cheng Investigator R.L. Edwards Investigator L.B. Railsback earth science paleoclimate speleothems age,null,null,year Common Era,null,speleothems,null,null,N,StalAge model (best fit) earth science paleoclimate speleothems age,null,null,year Common Era,null,speleothems,null,null,N,Age model considering petrography (Railsback et al. 2013) and StalAge AD earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,Distance from the top of the stalagmite earth science paleoclimate speleothems sample identification,null,null,null,null,speleothems,null,null,C,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 notes,null,null,null,null,speleothems,null,null,C,A= aragonite; C= calcite; rA= ray aragonite earth science paleoclimate speleothems age,null,unspecified error lower bound,year Common Era,null,speleothems,null,null,N,StalAge model (upper limit uncertainty) earth science paleoclimate speleothems age,null,unspecified error upper bound,year Common Era,null,speleothems,null,null,N,StalAge model (lower limit uncertainty) 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 delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,isotope ratio mass spectrometry,N,with 0.8 subtracted for data from aragonite (Romanek et al. 1992) to convert data to a calcite basis and to eliminate the effect of fractionation between aragonite and calcite earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,isotope ratio mass spectrometry,N,with 1.7 subtracted for data from aragonite (Kim et al. 2007) to convert data to a calcite basis and to eliminate the effect of fractionation between aragonite and calcite) earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation Intertropical Convergence Zone (ITCZ) 1463 AD 1950 AD 487 cal yr BP 0 cal yr BP Complete -19.4 -19.4 17.883333 17.883333 Continent Africa Southern Africa Namibia Dante Cave>LATITUDE -19.4>LONGITUDE 17.883333 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 Ny Riavo G. Voarintsoa, George A. Brook, Fuyuan Liang, Eugene Marais, Ben Hardt, Hai Cheng, R. Lawrence Edwards, and L. Bruce Railsback 2016 The Holocene 10.1177/0959683616660170 http://hol.sagepub.com/content/early/2016/07/20/0959683616660170.abstract

Multiple proxies using variation in d18O, d13C, mineralogy, and petrography in a newly generated high-resolution record of Stalagmite DP1 from Dante Cave indicate a linkage between changes in hydroclimate in northeastern Namibia and changes in solar activity and changes in global temperatures. The record suggests that during solar minima and globally cooler conditions (ca. 1660-1710 and ca. 1790-1830), wetter periods (reflecting longer summer seasons) in northeastern Namibia were linked to advances of the Inter-Tropical Convergence Zone (ITCZ) and the Inter-Ocean Convergence Zone (IOCZ) southwestward. A slight southward push of the Angola-Benguela Front (ABF) during such intervals could also be expected, bringing more rainfall inland. On the other hand, drier and warmer periods in northeastern Namibia, inferred from the increasing d18O trend in Stalagmite DP1 after AD 1715, coincide with globally warmer conditions, and thus a northeastward migration of the ITCZ, specifically with more warming of the Northern Hemisphere (NH). This finding agrees with reducing precipitation observed in the summer rainfall zone of southern Africa since ca. 1900. Therefore, predictions of warming in high-latitude regions of the NH in the next century should suggest that the presently semi-arid climate of northern Namibia may become even drier. STUDY NOTES: Stalagmite stable isotope (d13C and d18O) data from Dante Cave, Namibia for the past 550 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/dante2016.txt Data File; Dante Cave Stalagmite DP1 Stable Isotope Data USA/NOAA DIF Version 9.8.4 2019-02-20 2019-02-20