Savusavu Bay, Fiji Diploastrea Coral Oxygen Isotope Data --------------------------------------------------------------------- NOAA Paleoclimatology Program and World Data Center for Paleoclimatology, Boulder --------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Savusavu Bay, Fiji Diploastrea Coral Oxygen Isotope Data LAST UPDATE: 6/2005 (Original Receipt by WDC Paleo) CONTRIBUTOR: Stefan Bagnato, University at Albany IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2005-041 SUGGESTED DATA CITATION: Bagnato, S., et al., 2005, Savusavu Bay, Fiji Diploastrea Coral Oxygen Isotope Data, IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2005-041. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Bagnato, S., B.K. Linsley, S.S. Howe, G.M. Wellington, and J. Salinger. 2005. Coral oxygen isotope records of interdecadal climate variations in the South Pacific Convergence Zone region. Geochemistry, Geophysics, Geosystems, Vol. 6, Q06001, 1 June 2005. doi:10.1029/2004GC000879 ABSTRACT: The South Pacific Convergence Zone (SPCZ), a region of high rainfall, is a major feature of subtropical Southern Hemisphere climate and contributes to and interacts with circulation features across the Pacific, yet its past temporal variability and forcing remain only partially understood. Here we compare coral oxygen isotopic (d18O) series (spanning A.D. 1997–1780 and A.D. 2001–1776) from two genera of hermatypic corals in Fiji, located within the SPCZ, to examine the fidelity of these corals in recording climate change and SPCZ interdecadal dynamics. One of these coral records is a new 225-year subannually resolved d18O series from the massive coral Diploastrea heliopora. Diploastrea's use in climate reconstructions is still relatively new, but this coral has shown encouragingly similar interannual variability to Porites, the coral genus most commonly used in Pacific paleoclimate studies. In Fiji we observe that interdecadal d18O variance is also similar in these two coral genera, and Diploastrea contains a larger-amplitude interdecadal signal that more closely tracks instrumental-based indices of Pacific interdecadal climate change and the SPCZ than Porites. Both coral d18O series record greater interdecadal variability from ~1880 to 1950, which is consistent with the observations of Folland et al. (2002), who reported higher variability in SPCZ position before 1945. These observations indicate that Diploastrea will likely provide a significant new source of long-term climate information from the SPCZ region. GEOGRAPHIC REGION: Fiji, Western equatorial Pacific PERIOD OF RECORD: 1776 - 2001 AD DESCRIPTION: The composite d18O record presented is an average of two Diploastrea cores collected from opposite sides of the channel in Savusavu Bay, Fiji that spans 1776-2001 (period of overlap 1940-1997), both normalized to the 1970-1996 mean. Both cores were sampled at 0.5 mm intervals within the upper 50 mm, and at 1 mm intervals below 50 mm depth. Site: Savusavu Bay, Fiji 16 deg. 49' S, 179 deg. 14' E, 2m. water depth. Diploastrea heliopora. DATA: Fiji Diploastrea coral d18O centered data (1970-1996 mean subtracted) Year d18O 2001 -0.046 2000 -0.134 1999 0.03 1998 0.363 1997 0.224 1996 -0.14 1995 0.053 1994 0.149 1993 0.12 1992 0.058 1991 -0.003 1990 -0.127 1989 -0.26 1988 -0.085 1987 0.292 1986 0.116 1985 -0.052 1984 -0.017 1983 0.208 1982 0.027 1981 0.013 1980 0.09 1979 -0.014 1978 0.057 1977 0.048 1976 -0.147 1975 -0.206 1974 -0.155 1973 0.006 1972 -0.051 1971 -0.098 1970 0.119 1969 0.16 1968 -0.059 1967 0.022 1966 0.125 1965 0.164 1964 0.137 1963 0.019 1962 -0.032 1961 -0.057 1960 -0.076 1959 0.069 1958 0.264 1957 0.006 1956 -0.172 1955 -0.164 1954 0.023 1953 0.131 1952 0.027 1951 -0.071 1950 -0.125 1949 -0.099 1948 -0.083 1947 -0.06 1946 -0.013 1945 -0.023 1944 -0.199 1943 -0.111 1942 0.109 1941 0.146 1940 0.131 1939 -0.013 1938 0.16 1937 0.114 1936 0.189 1935 0.432 1934 0.356 1933 0.346 1932 0.412 1931 0.62 1930 0.47 1929 0.357 1928 0.14 1927 0.46 1926 0.488 1925 0.254 1924 0.268 1923 0.291 1922 0.029 1921 0.036 1920 0.206 1919 0.264 1918 0.023 1917 -0.177 1916 -0.115 1915 0.16 1914 0.172 1913 0.102 1912 0.125 1911 -0.024 1910 -0.056 1909 -0.012 1908 -0.109 1907 -0.105 1906 0.143 1905 0.263 1904 0.196 1903 -0.04 1902 0.042 1901 0.201 1900 0.207 1899 0.008 1898 -0.064 1897 -0.237 1896 0.203 1895 0.128 1894 -0.224 1893 -0.229 1892 -0.363 1891 -0.132 1890 -0.142 1889 -0.067 1888 0.076 1887 -0.007 1886 0.29 1885 0.451 1884 0.393 1883 0.185 1882 -0.117 1881 -0.082 1880 -0.094 1879 0.104 1878 0.378 1877 0.292 1876 0.25 1875 0.011 1874 0.147 1873 0.008 1872 -0.061 1871 -0.191 1870 0.041 1869 0.224 1868 0.12 1867 0.184 1866 0.298 1865 0.185 1864 0.162 1863 0.041 1862 0.062 1861 -0.013 1860 -0.01 1859 0.119 1858 0.218 1857 -0.12 1856 0.088 1855 0.08 1854 0.121 1853 0.152 1852 0.135 1851 0.185 1850 0.248 1849 -0.016 1848 -0.139 1847 -0.09 1846 0.06 1845 0.123 1844 0.086 1843 -0.015 1842 0.042 1841 0.197 1840 0.131 1839 0.264 1838 0.12 1837 0.088 1836 0.043 1835 0.113 1834 0.277 1833 0.232 1832 0.178 1831 0.212 1830 0.034 1829 0.078 1828 0.084 1827 0.19 1826 0.208 1825 0.606 1824 0.252 1823 0.24 1822 0.288 1821 0.255 1820 0.02 1819 0.153 1818 0.27 1817 0.235 1816 0.225 1815 0.194 1814 0.222 1813 0.294 1812 0.415 1811 0.55 1810 0.337 1809 0.231 1808 0.111 1807 0.073 1806 0.218 1805 0.638 1804 0.418 1803 0.215 1802 0.362 1801 0.426 1800 0.44 1799 0.281 1798 0.339 1797 0.026 1796 0.083 1795 0.173 1794 0.379 1793 0.429 1792 0.334 1791 0.146 1790 0.168 1789 0.049 1788 0.183 1787 0.258 1786 0.22 1785 0.389 1784 0.386 1783 0.357 1782 0.351 1781 0.371 1780 0.372 1779 0.323 1778 0.487 1777 0.614 1776 0.732