noaa-cave-22970 Madagascar Holocene Stalagmite Stable Isotope Data Voarintsoa, N.R.G.; Railsback, L.B.; Brook, G.A.; Wang, L.; Kathayat, G.; Cheng, H.; Li, X.; Edwards, R.L.; Rakotondrazafy, A.F.M.; Madison Razanatseheno, M.O. Madagascar Holocene Stalagmite Stable Isotope Data 2017-10-29 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22970 Investigator N.R.G. Voarintsoa Investigator L.B. Railsback Investigator G.A. Brook Investigator L. Wang Investigator G. Kathayat Investigator H. Cheng Investigator X. Li Investigator R.L. Edwards Investigator A.F.M. Rakotondrazafy Investigator M.O. Madison Razanatseheno earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,Distance from the top of the stalagmite earth science paleoclimate speleothems age,null,null,calendar year before present,null,speleothems,null,null,N,null 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,Nature of the spelean minerals (A= aragonite; C= calcite; A-C= mixture of aragonite and calcite - see papers for details) 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,transformed = d13Craw – [RA/C x 1.7] where A= aragonite and C= calcite earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,isotope ratio mass spectrometry,N,transformed = d18Oraw – [RA/C x 0.8] where A= aragonite and C= calcite earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 9880 cal yr BP 140 cal yr BP Complete -15.57839 -15.53 46.73436 46.88 50 50 Ocean Indian Ocean Madagascar Anjohibe Cave>LATITUDE -15.53>LONGITUDE 46.88 Ocean Indian Ocean Madagascar Anjokipoty Cave>LATITUDE -15.57839>LONGITUDE 46.73436 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 Gilbertinie Voarintsoa, Loren Bruce Railsback, George Albert Brook, Lixin Wang, Gayatri Kathayat, Hai Cheng, Xianglei Li, Richard Lawrence Edwards, Amos Fety Michel Rakotondrazafy, and Marie Olga Madison Razanatseheno 2017 Climate of the Past 13 12 1771-1790 10.5194/cp-13-1771-2017 https://www.clim-past.net/13/1771/2017/

Petrographic features, mineralogy, and stable isotopes from two stalagmites, ANJB-2 and MAJ-5, respectively from Anjohibe and Anjokipoty caves, allow distinction of three intervals of the Holocene in NW Madagascar. The Malagasy early Holocene (between ca. 9.8 and 7.8ka) and late Holocene (after ca. 1.6ka) intervals (MEHI and MLHI, respectively) record evidence of stalagmite deposition. The Malagasy middle Holocene interval (MMHI, between ca. 7.8 and 1.6ka) is marked by a depositional hiatus of ca. 6500 years. Deposition of these stalagmites indicates that the two caves were sufficiently supplied with water to allow stalagmite formation. This suggests that the MEHI and MLHI intervals may have been comparatively wet in NW Madagascar. In contrast, the long-term depositional hiatus during the MMHI implies it was relatively drier than the MEHI and the MLHI. The alternating wet-dry-wet conditions during the Holocene may have been linked to the long-term migrations of the Intertropical Convergence Zone (ITCZ). When the ITCZ's mean position is farther south, NW Madagascar experiences wetter conditions, such as during the MEHI and MLHI, and when it moves north, NW Madagascar climate becomes drier, such as during the MMHI. A similar wet-dry-wet succession during the Holocene has been reported in neighboring locations, such as southeastern Africa. Beyond these three subdivisions, the records also suggest wet conditions around the cold 8.2ka event, suggesting a causal relationship. However, additional Southern Hemisphere high-resolution data will be needed to confirm this. STUDY NOTES: Stalagmite stable isotope (d18O and d13C) data from Anjohibe and Anjokipoty Caves, Madagascar for the past 10,000 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjohibe2017c.txt Formatted Text Data File; Anjohibe Cave Holocene Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjokipoty2017.txt Formatted Text Data File; Anjokipoty Cave Holocene Stalagmite Stable Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11