noaa-coral-8607 Mentawai - d18O Data and DMI Reconstruction Abram, N.J.; Gagan, M.K.; Cole, J.E.; Hantoro, W.S.; Mudelsee, M. Mentawai - d18O Data and DMI Reconstruction 2008-01-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/8607 Investigator N.J. Abram Investigator M.K. Gagan Investigator J.E. Cole Investigator W.S. Hantoro Investigator M. Mudelsee earth science paleoclimate climate reconstructions|corals and sclerosponges Dipole Mode Index,delta 18O,null,standard deviation unit,monthly,climate reconstructions|corals and sclerosponges,normalized,null,N,reference period: 1960-1990 A.D. earth science paleoclimate corals and sclerosponges delta 18O,Porites sp.,null,per mil VPDB,null,corals and sclerosponges,anomalized|interpolated,isotope ratio mass spectrometry,N,anomalized to mean annual cycle earth science paleoclimate climate reconstructions|corals and sclerosponges Dipole Mode Index,delta 18O,null,standard deviation unit,monthly,climate reconstructions|corals and sclerosponges,filtered|normalized,null,N,"reference period: 1960-1990 A.D., filter: Gaussian to retain periods < 7 years" earth science paleoclimate climate reconstructions|corals and sclerosponges age,null,null,year Common Era,null,climate reconstructions|corals and sclerosponges,null,null,N,null earth science paleoclimate corals and sclerosponges delta 18O,Porites sp.,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges oxygen isotopes geoscientificInformation Atmospheric and Oceanic Circulation Patterns Reconstruction PAGES 2k Network PAGES Australasia 2k 1846 AD 1998 AD 104 cal yr BP -48 cal yr BP Complete -.13 -.13 98.52 98.52 -6 -6 Ocean Indian Ocean Indonesia Mentawai>LATITUDE -.13>LONGITUDE 98.52 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 Abram, N.J., M.K. Gagan, J.E. Cole, W.S. Hantoro, and M. Mudelsee. 2008. Recent intensification of tropical climate variability in the Indian Ocean. Nature Geoscience, 1 (12), 849-853. doi:10.1038/ngeo357. Charles, C.D.; Cobb, K.M.; Moore, M.D.; Fairbanks, R.G 2003 Marine Geology 201 10.1016/S0025-3227(03)00217-2 Charles, C.D., D.E.Hunter, and R.G.Fairbanks 1997 Science 277 925-928 Pfeiffer, M.; Dullo, W.C 2006 Quaternary Science Reviews 25 Saji, N.H; Goswami, B.N.; Vinayachandran, P.H.; Yamagata, T 1999 Nature 401

The interplay of the El Nino Southern Oscillation, Asian monsoon and Indian Ocean Dipole (IOD) drives climatic extremes in and around the Indian Ocean. Historical and proxy records reveal changes in the behaviour of the El Nino Southern Oscillation and the Asian monsoon over recent decades. However, reliable instrumental records of the IOD cover only the past 50 years, and there is no consensus on long- term variability of the IOD or its possible response to greenhouse gas forcing. Here we use a suite of coral oxygen-isotope records to reconstruct a basin-wide index of IOD behaviour since AD 1846. Our record reveals an increase in the frequency and strength of IOD events during the twentieth century, which is associated with enhanced seasonal upwelling in the eastern Indian Ocean. Although the El Nino Southern Oscillation has historically influenced the variability of both the IOD and the Asian monsoon, we find that the recent intensification of the IOD coincides with the development of direct, positive IOD-monsoon feedbacks. We suggest that projected greenhouse warming may lead to a redistribution of rainfall across the Indian Ocean and a growing interdependence between the IOD and Asian monsoon precipitation variability.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/mentawai2008.xls Excel File; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-d18o_noaa.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-dmi_noaa.txt USA/NOAA DIF Version 9.8.4 2019-06-18 2019-06-18