Mentawai - d18O Data and DMI Reconstruction Abram, N.J.; Gagan, M.K.; Cole, J.E.; Hantoro, W.S.; Mudelsee, M. Abram, N.J. Gagan, M.K. Cole, J.E. Hantoro, W.S. Mudelsee, M. Atmospheric and Oceanic Circulation Patterns Reconstruction PAGES 2k Network PAGES Australasia 2k 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 (Mentawai>LATITUDE -.13>LONGITUDE 98.52) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Abram, N.J. Investigator : Gagan, M.K. Investigator : Cole, J.E. Investigator : Hantoro, W.S. Investigator : Mudelsee, M. 2008-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/8607 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/mentawai2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-d18o_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-dmi_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/mentawai2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-d18o_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-dmi_noaa.txt English https://www.ncdc.noaa.gov/paleo/study/8607 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/mentawai2008.xls https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-d18o_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/abram2008-dmi_noaa.txt 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.G2003Monsoon-tropical ocean interaction in a network of coral records spanning the 20th centuryMarine Geology20110.1016/S0025-3227(03)00217-2 Charles, C.D., D.E.Hunter, and R.G.Fairbanks1997Interaction Between the ENSO and the Asian Monsoon in a Coral Record of Tropical ClimateScience277925-928 Pfeiffer, M.; Dullo, W.C2006Monsoon-induced cooling of the western equatorial Indian Ocean as recorded in coral oxygen isotope records from the Seychelles covering the period of 1840-1994 ADQuaternary Science Reviews25 Saji, N.H; Goswami, B.N.; Vinayachandran, P.H.; Yamagata, T1999A dipole mode in the tropical Indian OceanNature401 START YEAR: 1846 AD * END YEAR: 1998 AD 98.52 -.13 98.52 -.13