Bahamas Sclerosponge Lead and Carbon 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: Bahamas Sclerosponge Lead and Carbon Isotope Data LAST UPDATE: 11/2004 (Original Receipt by WDC Paleo) CONTRIBUTORS: Lazareth, C.E., Willenz P., Navez J., Keppens E., Dehairs F. & André L. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2004-076 SUGGESTED DATA CITATION: Lazareth, C.E., et al. 2004. Bahamas Sclerosponge Lead and Carbon Isotope Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2004-076. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Lazareth, C.E., P. Willenz, J. Navez, E. Keppens, F. Dehairs, and L. André. 2000. Sclerosponges as a new potential recorder of environmental changes: Lead in Ceratoporella nicholsoni. Geology, 28, 515-518. ABSTRACT: Lead concentrations have been analyzed on a 223 yr profile through the aragonitic skeleton of the reef-building Caribbean sclerosponge Ceratoporella nicholsoni by using laser-ablation inductively coupled plasma–mass spectrometry. A parallel study of the d13C distribution in the skeleton validates the previously established mean annual growth rate of 230 µm/yr, at least for long-term important environmental changes. The Pb trend in the specimen displays a general increase from 0.30 ppm ca. A.D. 1760 to 2.15 ppm ca. A.D. 1984; a major threefold increase occurred after 1930. This Pb profile is analogous to results acquired from ice or coral cores and clearly highlights the potential of sclerosponges as a new proxy of environmental changes for time series extending over several centuries. GEOGRAPHIC REGION: Bahamas, tropical North Atlantic PERIOD OF RECORD: 1724-1983 AD DESCRIPTION: Lazareth et al. 2000 Bahamas Sclerosponge Lead and Carbon Isotope Data A specimen of Ceratoporella nicholsoni, 14 cm in diameter, was collected in a reef crevice at a depth of 30 m on the fore-reef slope of Jamaica Bay (southern tip of Acklins Island), Bahamas, in August 1985. A diamond saw was used to cut a 5-mm-thick slab perpendicular to the surface of the specimen. A maximum age of 390 yr was assigned to the specimen (9 cm high along growth axis), based on a mean annual growth rate of 230 ± 45 mm/yr, obtained from in situ labeling of 10 specimens with calcein over a 10 yr interval in Jamaica (Willenz and Hartman, 1999). Carbon isotope analysis was performed on a Finnigan Mat Delta E stable isotope-ratio mass spectrometer. The Pb data were acquired by using laser-ablation inductively coupled plasma–mass spectrometry (LA-ICP-MS), a microanalysis technique allowing high spatial and thus temporal resolution. The LA-ICP-MS analyses were made with a frequency-quadrupled ultraviolet-wavelength (266 nm) Nd-YAG (neodymium-doped yttrium aluminum garnet) Fisons-VG microprobe and a Fisons-VG PlasmaQuad II+ mass spectrometer. DATA: 1. Ceratoporella nicholsoni delta 13C Column 1: Year Column 2: d13C (3pt running average) Year d13C (3pt.Avg.) 1983 4.14 1981 4.18 1978 4.24 1975 4.30 1967 4.33 1964 4.34 1959 4.40 1956 4.41 1953 4.40 1950 4.38 1945 4.44 1943 4.36 1939 4.40 1937 4.38 1934 4.38 1930 4.36 1928 4.40 1925 4.53 1921 4.57 1917 4.59 1914 4.57 1910 4.59 1909 4.57 1906 4.64 1904 4.65 1900 4.69 1899 4.68 1896 4.67 1894 4.64 1891 4.62 1889 4.65 1885 4.65 1884 4.71 1880 4.72 1879 4.76 1875 4.80 1870 4.81 1869 4.86 1865 4.84 1861 4.83 1859 4.82 1857 4.84 1854 4.84 1851 4.82 1848 4.82 1845 4.76 1844 4.75 1842 4.73 1838 4.75 1834 4.78 1831 4.82 1827 4.87 1824 4.87 1821 4.89 1818 4.91 1816 4.93 1813 4.92 1811 4.90 1808 4.87 1804 4.90 1802 4.89 1798 4.91 1795 4.88 1791 4.88 1789 4.87 1785 4.88 1783 4.92 1779 4.94 1778 4.93 1773 4.94 1771 4.97 1768 4.98 1765 4.93 1762 4.93 1760 4.92 1756 4.96 1748 4.93 1748 4.94 1745 4.96 1742 4.94 1739 4.92 1737 4.83 1732 4.84 1730 4.88 1724 4.98 2. Ceratoporella nicholsoni lead Column 1: Year Column 2: Lead (3pt running average) years Lead 1981 2.15 1979 2.31 1977 2.45 1976 2.11 1974 2.16 1973 2.00 1971 2.16 1969 1.90 1968 1.77 1966 1.59 1964 1.82 1963 1.89 1961 1.87 1959 1.55 1958 1.51 1956 1.70 1954 1.68 1951 1.57 1950 1.18 1948 1.09 1946 1.11 1945 1.00 1943 0.91 1941 0.77 1940 0.78 1938 0.84 1936 0.82 1935 0.84 1933 0.74 1931 0.73 1930 0.70 1928 0.67 1927 0.70 1925 0.77 1923 0.80 1922 0.79 1920 0.85 1918 0.89 1917 0.93 1915 0.85 1913 0.84 1912 0.77 1910 0.88 1908 0.89 1907 0.99 1905 0.90 1904 0.91 1902 0.90 1900 0.81 1894 0.79 1892 0.67 1891 0.60 1889 0.56 1888 0.58 1886 0.58 1884 0.62 1883 0.61 1881 0.64 1879 0.59 1878 0.57 1876 0.56 1874 0.63 1873 0.68 1871 0.72 1869 0.71 1868 0.68 1866 0.63 1865 0.54 1863 0.50 1861 0.46 1860 0.44 1858 0.43 1856 0.42 1855 0.41 1853 0.42 1851 0.43 1850 0.42 1848 0.40 1846 0.37 1845 0.34 1843 0.36 1842 0.39 1840 0.41 1838 0.38 1837 0.37 1835 0.34 1834 0.36 1832 0.36 1830 0.38 1829 0.37 1827 0.32 1826 0.33 1824 0.36 1822 0.40 1821 0.38 1819 0.35 1817 0.35 1816 0.35 1814 0.37 1812 0.39 1811 0.44 1809 0.44 1807 0.42 1806 0.34 1804 0.30 1803 0.29 1801 0.29 1799 0.40 1798 0.38 1796 0.40 1794 0.31 1793 0.31 1791 0.31 1789 0.31 1788 0.30 1786 0.30 1784 0.36 1783 0.36 1781 0.35 1780 0.27 1778 0.29 1776 0.28 1775 0.29 1773 0.30 1771 0.30 1770 0.28 1768 0.28 1766 0.30 1765 0.33 1763 0.30