noaa-ocean-19139 Eastern Tropical Indian Ocean 45,000 Year d18O and SST Reconstructions Mohtadi, M.; Prange, M.; Oppo, D.W.; De Pol-Holz, R.; Merkel, U.; Zhang, X.; Steinke, S.; Lückge, A. Eastern Tropical Indian Ocean 45,000 Year d18O and SST Reconstructions 2015-08-24 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19139 Investigator M. Mohtadi Investigator M. Prange Investigator D.W. Oppo Investigator R. De Pol-Holz Investigator U. Merkel Investigator X. Zhang Investigator S. Steinke Investigator A. Lückge earth science paleoclimate climate reconstructions|paleoceanography delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,corrected,null,N,sea-level corrected after Waelbroeck et al. (2002); HL equation of Bemis et al. (1998) earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,from Mg/Ca Globigerinoides ruber white sensu stricto; calculated after Anand et al. (2003) earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Globigerinoides ruber sensu stricto,null,per mil PDB,null,paleoceanography,null,null,N,sensu stricto 250-355um; G. ruber white earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean reconstruction geoscientificInformation Sea Surface Temperature Reconstruction 45330 cal yr BP 60 cal yr BP Complete -.7833 3.5167 96.3167 99.9 -808 -481 Ocean Indian Ocean SO189-144KL>LATITUDE 1.15>LONGITUDE 98.0667 Ocean Indian Ocean SO189-39KL>LATITUDE -.7833>LONGITUDE 99.9 Ocean Indian Ocean SO189-119KL>LATITUDE 3.5167>LONGITUDE 96.3167 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 Mahyar Mohtadi, Matthias Prange, Delia W. Oppo, Ricardo De Pol-Holz, Ute Merkel, Xiao Zhang, Stephan Steinke, Andreas Lückge 2014 Nature 509 7498 76-80 10.1038/nature13196 http://www.nature.com/nature/journal/v509/n7498/full/nature13196.html

The response of the tropical climate in the Indian Ocean realm to abrupt climate change events in the North Atlantic Ocean is contentious. Repositioning of the intertropical convergence zone is thought to have been responsible for changes in tropical hydroclimate during North Atlantic cold spells, but the dearth of high-resolution records outside the monsoon realm in the Indian Ocean precludes a full understanding of this remote relationship and its underlying mechanisms. Here we show that slowdowns of the Atlantic meridional overturning circulation during Heinrich stadials and the Younger Dryas stadial affected the tropical Indian Ocean hydroclimate through changes to the Hadley circulation including a southward shift in the rising branch (the intertropical convergence zone) and an overall weakening over the southern Indian Ocean. Our results are based on new, high-resolution sea surface temperature and seawater oxygen isotope records of well-dated sedimentary archives from the tropical eastern Indian Ocean for the past 45,000 years, combined with climate model simulations of Atlantic circulation slowdown under Marine Isotope Stages 2 and 3 boundary conditions. Similar conditions in the east and west of the basin rule out a zonal dipole structure as the dominant forcing of the tropical Indian Ocean hydroclimate of millennial-scale events. Results from our simulations and proxy data suggest dry conditions in the northern Indian Ocean realm and wet and warm conditions in the southern realm during North Atlantic cold spells. STUDY NOTES: High-resolution (~30-80 years) foraminiferal oxygen isotope (d18O) data for the past 45,000 years, plus reconstructed sea-surface temperature and seawater d18O, from 3 eastern tropical Indian Ocean sediment cores.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2014/mohtadi2014-119kl.txt Data File; Core SO39-119KL d18O, SST, and d18Osw Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2014/mohtadi2014-144kl.txt Data File; Core SO189-144KL d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2014/mohtadi2014-39kl.txt Data File; Core SO39-39KL d18O, SST, and d18Osw Data USA/NOAA DIF Version 9.8.4 2019-06-06 2019-06-06