noaa-cave-25710 Madagascar Deglacial Speleothem Stable Isotope Data Scroxton, N.; Burns, S.J.; McGee, D.; Hardt, B.F.; Godfrey, L.R.; Ranivoharimanana, L.; Faina, P. Madagascar Deglacial Speleothem Stable Isotope Data 2019-02-20 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25710 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 carbon isotopes earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 22225 cal yr BP 11912 cal yr BP Complete -24.048 -24.048 43.753 43.753 20 20 Ocean Indian Ocean Madagascar Tsimanampesotse National Park>LATITUDE -24.048>LONGITUDE 43.753 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 2019 Paleoceanography and Paleoclimatology 10.1029/2018PA003466 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018PA003466

The global paleomonsoon concept predicts an antiphase response of monsoon rainfall in the northern and southern hemispheres at timescales where there is asymmetric solar forcing and/or asymmetric hemispheric temperature changes. However, as different monsoon systems have different sensitivities to local, regional and global forcing, rainfall response may vary regionally, particularly during large global climatic changes such as the last deglaciation where warming occurred in both hemispheres. Despite its role as a key southern hemisphere counterpart to the Arabian and Indian summer monsoons, the behavior of the summer monsoon in the southern hemisphere of the Indian Ocean during the last deglaciation is unknown. Therefore, we present a new high-resolution, precisely dated, and replicated speleothem stable isotope record from Tsimanampesotse National Park in southwest Madagascar that covers the last deglaciation. We show that speleothem growth phases respond largely to movements of the southern hemisphere summer Hadley circulation (summer extent of the tropical rainbelt/mean Intertropical Convergence Zone location), with some contribution from sea-surface temperature changes at key times, such as during the Bolling-Allerod. In contrast, speleothem d18O responds primarily to sea-surface temperature, in particular the location of the deep atmospheric convection isotherm, while summer Hadley circulation changes take a secondary role. Separating the varying influences of temperature and atmospheric circulation in controlling southwest Madagascan rainfall is critical to understanding rainfall variability in both the past and the future. STUDY NOTES: Speleothem stable isotope (d13C, d18O) data from 2 stalagmites collected in Tsimanampesotse National Park, southwest Madagascar, for the deglacial interval (~22-11 kyrbp).

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019mt1.txt NOAA Template File; Tsimanampesotse Speleothem MT1 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019ad4.txt NOAA Template File; Tsimanampesotse Speleothem AD4 Stable Isotope Data USA/NOAA DIF Version 9.8.4 2019-02-20 2019-02-20