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. Voarintsoa, N.R.G. Brook, G.A. Liang, F. Marais, E. Hardt, B.F. Cheng, H. Edwards, R.L. Railsback, L.B. Intertropical Convergence Zone (ITCZ) 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 earth science/paleoclimate/speleothems (Dante Cave>LATITUDE -19.4>LONGITUDE 17.883333) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Voarintsoa, N.R.G. Investigator : Brook, G.A. Investigator : Liang, F. Investigator : Marais, E. Investigator : Hardt, B.F. Investigator : Cheng, H. Investigator : Edwards, R.L. Investigator : Railsback, L.B. 2016-08-11 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20433 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/dante2016.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/dante2016.txt English https://www.ncdc.noaa.gov/paleo/study/20433 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/dante2016.txt Ny Riavo G. Voarintsoa, George A. Brook, Fuyuan Liang, Eugene Marais, Ben Hardt, Hai Cheng, R. Lawrence Edwards, and L. Bruce Railsback2016Stalagmite multi-proxy evidence of wet and dry intervals in northeastern Namibia: Linkage to latitudinal shifts of the Inter-Tropical Convergence Zone and changing solar activity from AD 1400 to 1950The Holocene10.1177/0959683616660170http://hol.sagepub.com/content/early/2016/07/20/0959683616660170.abstract START YEAR: 1463 AD * END YEAR: 1950 AD 17.883333 -19.4 17.883333 -19.4