noaa-cave-21850 Anjohibe Cave, Madagascar 1700 Year Speleothem Stable Isotope Data Scroxton, N.; Burns, S.J.; McGee, D.; Hardt, B.F.; Godfrey, L.R.; Ranivoharimanana, L.; Faina, P. Anjohibe Cave, Madagascar 1700 Year Speleothem Stable Isotope Data 2017-04-10 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21850 Investigator N. Scroxton Investigator S.J. Burns Investigator D. McGee Investigator B.F. Hardt Investigator L.R. Godfrey Investigator L. Ranivoharimanana Investigator P. Faina earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil PDB,null,speleothems,averaged|interpolated,isotope ratio mass spectrometry,N,2 yr equally spaced interpolated record created in Matlab using a cubic hermite interpolating spline: mineralogy converted data interpolated to 2 month resolution then averaged to two year bins earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,gas chromatography|isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems calcite,calcium carbonate,null,percent,null,speleothems,raw,null,N,null earth science paleoclimate speleothems age,null,null,year Common Era,null,speleothems,null,null,N,U-Th series; Oxcal Age Model Software earth science paleoclimate speleothems age,null,null,year Common Era,null,speleothems,null,null,N,mid-point of two year bin earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,gas chromatography|isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,null,N,converted to 100% equivalent aragonite: raw value + (%calcite x 0.7permill) earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil PDB,null,speleothems,averaged|interpolated,isotope ratio mass spectrometry,N,2 yr equally spaced interpolated record created in Matlab using a cubic hermite interpolating spline: mineralogy converted data interpolated to 2 month resolution then averaged to two year bins earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,corrected,null,N,converted to 100% equivalent aragonite: raw value + (%calcite x 2.5permill) earth science paleoclimate speleothems age,null,two standard deviations,year,null,speleothems,null,null,N,Oxcal Age Model Software earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation Intertropical Convergence Zone (ITCZ) Monsoon 1567 cal yr BP -63 cal yr BP Complete -15.53 -15.53 46.88 46.88 50 50 Ocean Indian Ocean Madagascar Anjohibe Cave>LATITUDE -15.53>LONGITUDE 46.88 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 Nick Scroxton, Stephen J. Burns, David McGee, Ben Hardt, Laurie R. Godfrey, Lovasoa Ranivoharimanana, Peterson Faina 2017 Quaternary Science Reviews 164 25-36 10.1016/j.quascirev.2017.03.017 http://www.sciencedirect.com/science/article/pii/S0277379116306734

Paleoclimate studies of tropical rainfall have led to a recognition of a predominant pattern of anti-phase behavior between the Northern and Southern hemispheres at both orbital and millennial timescales. Less certain is how regional tropical rainfall patterns have changed in the late Holocene, under boundary conditions and on timescales which are most relevant to the tropics' response to a warming world. Several high-resolution southern hemisphere rainfall records are at odds with meridional movement of the mean Inter-Tropical Convergence Zone location as the major driver of Holocene tropical rainfall variability, with regional precipitation patterns resembling modern day El-Niño Southern Oscillation end members. To test emerging ideas on sub-millennial tropical rainfall variability, additional records from the southern hemisphere are required. We present a new speleothem d18O record from Anjohibe Cave, northwestern Madagascar, which provides a quasi-annual record of monsoonal strength and precipitation amount for the last 1700 years. The majority of d18O variability in the record is at the decadal scale, and shows little to no correlation with major climate indices or cyclical climate drivers. At lower frequencies, changes in mean speleothem d18O show good correlation with other regional precipitation records both north and south of the equator. The regional coherency of tropical rainfall across the west Indian Ocean resembles expansion and contraction of the tropical rain belt and positive-Indian Ocean Dipole-like conditions at different timescales. The cause of this coherency could be related to symmetrical changes in continental sensible heating, or to a low frequency sea surface temperature climate mode. STUDY NOTES: Speleothem stable isotope (d18O and d13C) data from Anjohibe Cave, Madagascar for the past 1700 years as a record of the Madagascan monsoon.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjohibe2017iso.txt Formatted Text Data File; Anjohibe Cave Speleothem AB2 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/anjohibe2017iso2yr.txt Formatted Text Data File; Anjohibe Cave Speleothem AB2 Stable Isotope Data, 2 year interpolation USA/NOAA DIF Version 9.8.4 2019-02-20 2019-02-20