Madagascar Deglacial Speleothem Stable Isotope Data Scroxton, N.; Burns, S.J.; McGee, D.; Hardt, B.F.; Godfrey, L.R.; Ranivoharimanana, L.; Faina, P. Scroxton, N. Burns, S.J. McGee, D. Hardt, B.F. Godfrey, L.R. Ranivoharimanana, L. Faina, P. earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Tsimanampesotse National Park>LATITUDE -24.048>LONGITUDE 43.753) 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). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Scroxton, N. Investigator : Burns, S.J. Investigator : McGee, D. Investigator : Hardt, B.F. Investigator : Godfrey, L.R. Investigator : Ranivoharimanana, L. Investigator : Faina, P. 2019-02-20 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25710 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019mt1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019ad4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019mt1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019ad4.txt English https://www.ncdc.noaa.gov/paleo/study/25710 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019mt1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/tsimanampesotse2019ad4.txt Nick Scroxton, Stephen J. Burns, David McGee, Ben Hardt, Laurie R. Godfrey, Lovasoa Ranivoharimanana, Peterson Faina2019Competing temperature and atmospheric circulation effects on southwest Madagascan rainfall during the last deglaciationPaleoceanography and Paleoclimatology10.1029/2018PA003466https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018PA003466 START YEAR: 22225 cal yr BP * END YEAR: 11912 cal yr BP 43.753 -24.048 43.753 -24.048