Ifaty Reef - Stable Isotope and Sr/Ca Data Zinke, J.; Dullo, W.-C.; Heiss, G.A.; Eisenhauer, A. Zinke, J. Dullo, W.-C. Heiss, G.A. Eisenhauer, A. PAGES 2k Network PAGES Australasia 2k earth science/paleoclimate/corals and sclerosponges (delta 13C,Porites lobata,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (strontium/calcium,Porites lobata,null,millimole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma atomic emission spectroscopy,N,null) earth science/paleoclimate/corals and sclerosponges (delta 18O,Porites lobata,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges earth science/paleoclimate/corals and sclerosponges earth science/paleoclimate/corals and sclerosponges (Ifaty Reef>LATITUDE -23.15>LONGITUDE 43.58) The Ifaty coral record from off SW Madagascar provide a 336-year coral oxygen isotope record that is used to investigate the natural variability of the western Indian Ocean subtropical SST dipole and ENSO. The coral oxygen isotope record primarily reflects past sea-surface temperature (SST) variability on seasonal to multidecadal scales. To validate the SST reconstructions derived from oxygen isotopes, Sr/Ca ratios were obtained for selected time windows (1973–1995, 1863–1910, 1784–1809, 1688–1710). The period 1675–1760 was found to be the coolest period of the entire record with anomalies of 0.3–0.5 °C that includes the Late Maunder Minimum (1675–1710). The warmest periods, as indicated by our data, occur between 1880 and 1900 and the upper part of the Ifaty record (1973–1995). We generated a time series of coral δ18O for different seasons of the year to investigate austral winter and summer SST variability that influences rainfall intensity over southern Africa. Winter coral δ18O is coherent with winter SST on decadal and multidecadal time scales between 1854 and 1995. We suggest that the Ifaty winter time series provides a record of winter SST variability over the Mozambique Channel/Agulhas Current region over 336 years. Strong Indian Ocean subtropical dipole events, occurring during austral summer, are displayed in the Ifaty record. The austral summer coral δ18O is coherent and in phase with ENSO indices on interannual time scales (2–4 years) between 1880–1920, 1930–1940 and after 1970. Our data indicate that the impact of ENSO on SW Indian Ocean SST and atmospheric circulation was also strong between 1680–1720 and 1760–1790, in agreement with other studies. We show evidence that these variations are caused by changes in the regional hydrologic balance. The results demonstrate that the impact of ENSO cycles in the region of the SW Indian Ocean has changed significantly since 1970 and relate to a warming of southwestern Indian Ocean surface waters altering the spatial signature of ENSO. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Zinke, J. Investigator : Dullo, W.-C. Investigator : Heiss, G.A. Investigator : Eisenhauer, A. 2004-11-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/1897 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/zinke2004_noaa.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/zinke2004_noaa.txt English https://www.ncdc.noaa.gov/paleo/study/1897 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/zinke2004_noaa.txt Zinke, J.; Dullo, W.C.; Heiss, G.A.; Eisenhauer, A2004ENSO and Indian Ocean subtropical dipole variability is recorded in a coral record off southwest Madagascar for the period 1659 to 1995Earth and Planetary Science Letters228-110.1016/j.epsl.2004.09.028 START YEAR: 1659 AD * END YEAR: 1995 AD 43.58 -23.15 43.58 -23.15