El Junco Lake, Galápagos Diatom T/E Index Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: El Junco Lake, Galápagos Diatom T/E Index Data LAST UPDATE: 3/2009 (Original receipt by WDC Paleo) CONTRIBUTORS: Jessica L. Conroy, Jonathan T. Overpeck, and Julia E. Cole, The University of Arizona, Alejandra Restrepo and Mark B. Bush, Florida Institute of Technology, Miriam Steinitz-Kannan, Northern Kentucky University, and Paul A. Colinvaux, Woods Hole Oceanographic Institute. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2009-018 WDC PALEO CONTRIBUTION SERIES CITATION: Conroy, J.L., et al. 2009. El Junco Lake, Galápagos Diatom T/E Index Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2009-017. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Conroy, J.L, A. Restrepo, J.T. Overpeck, M. Steinitz-Kannan, J.E. Cole, M.B. Bush, and P.A. Colinvaux. 2009. Unprecedented recent warming of surface temperatures in the eastern tropical Pacific Ocean. Nature Geoscience 2(1):46-50. DOI: 10.1038/NGEO390 ABSTRACT: Through its intimate connection with the El Niño/Southern Oscillation system, climate variability in the tropical Pacific Ocean influences climate across much of the planet. But the history of temperature change in the tropical Pacific Ocean during recent millennia is poorly known: the available annually resolved records are discontinuous and rarely span more than a few centuries. Longer records at coarser temporal resolution suggest that significant oceanographic changes, observed at multi-year to multi-century resolution, have had important effects on global climate. Here we use a diatom record from El Junco Lake, Galápagos, to produce a calibrated, continuous record of sea surface temperature in the eastern tropical Pacific Ocean at subdecadal resolution, spanning the past 1,200 years. Our reconstruction reveals that the most recent 50 years are the warmest 50-year period within the record. Because our diatom-based sea surface temperature index resembles Northern Hemisphere temperature reconstructions, we suggest that with continued anthropogenic warming, the eastern tropical Pacific Ocean may continue to warm. ADDITIONAL REFERENCE: Conroy, J.L., J.T. Overpeck, J.E. Cole, T.M. Shanahan, and M. Steinitz-Kannan. 2008. Holocene changes in eastern tropical Pacific climate inferred from a Galápagos lake sediment record. Quaternary Science Reviews, 27(11-12): 1166-1180. GEOGRAPHIC REGION: Eastern Tropical Pacific PERIOD OF RECORD: 731 AD - 2004 AD FUNDING SOURCES: US National Science Foundation (NSF) Graduate Research Fellowship, US National Oceanic and Atmospheric Administration (NOAA) Climate Program Office, and The University of Arizona Department of Geosciences. DESCRIPTION: El Junco Lake, Galápagos tychoplanktonic to epiphytic (T:E) diatom index, with the corresponding sampling depths and ages in Year AD (calibrated radiocarbon, 210Pb and 137Cs age model). Age model data is published in Conroy et al. (2008). El Junco Lake, Galápagos: 0°54'S, 89°29'W, 660m. elev, 6m. water depth DATA: Depth YearAD Diatom T/E Index 0 2004 5.7 0.5 1994 5.04 1 1993 4.34 1.5 1989 3.22 2 1987 3.04 2.5 1985 3.2 3 1982 2.7 3.5 1979 2.81 4 1976 2.67 4.5 1973 2.36 5 1970 1.63 5.5 1967 1.53 6 1964 1.76 6.5 1961 2.26 7 1957 1.71 7.5 1954 1.71 8 1951 2.6 8.5 1948 2.44 9 1944 2.55 9.5 1941 2.11 10 1938 2.23 10.5 1935 2 11 1932 2.24 11.5 1928 2.02 12 1925 2.21 12.5 1922 1.77 13 1919 1.29 13.5 1916 1.77 14 1913 1.63 14.5 1910 1.52 15 1907 1.42 15.5 1904 1.23 16 1901 1.18 16.5 1897 1.23 17 1894 1.15 17.5 1891 0.64 18 1888 0.09 18.5 1884 -0.03 19 1881 0.37 19.5 1877 -0.03 20 1874 0.1 20.5 1870 -0.08 21 1866 -0.4 21.5 1862 0.08 22 1858 0.21 22.5 1854 0.23 23 1849 -0.86 23.5 1845 0.6 24 1840 -0.53 24.5 1836 0.23 25 1831 -0.45 25.5 1826 -0.34 26 1821 -0.07 26.5 1816 -0.89 27 1811 0.2 27.5 1806 -0.09 28 1801 -0.11 28.5 1796 0.04 29 1790 0.76 29.5 1785 0.62 30 1779 0.63 30.5 1773 -0.25 31 1768 0.98 31.5 1762 1.28 32 1756 1.16 32.5 1750 -0.06 33 1744 0.01 33.5 1738 -1.38 34 1732 -1.06 34.5 1726 -1.3 35 1719 -1.77 35.5 1713 -0.91 36 1707 -1.93 36.5 1700 -1.34 37 1694 -0.54 37.5 1687 -1.46 38 1681 0.16 38.5 1674 -0.1 39 1668 0.8 39.5 1661 -0.23 40 1654 -0.8 40.5 1647 -0.8 41 1640 -1.23 41.5 1633 -1.22 42 1626 -1.48 42.5 1619 -1.67 43 1612 -1.49 43.5 1605 -2.62 44 1598 -1.61 44.5 1590 -1.85 45 1583 -1.67 45.5 1575 -1.39 46 1568 -1.78 46.5 1561 -1.81 47 1553 -1.73 47.5 1546 -1.96 48 1538 -1.74 48.5 1531 -1.46 49 1523 -1.16 49.5 1516 -1.59 50 1509 -1.45 50.5 1502 -1.77 51 1495 -1.59 51.5 1488 -1.57 52 1482 -1.43 52.5 1475 -2.01 53 1469 -2.05 53.5 1462 -1.25 54 1456 -0.49 54.5 1450 -1.1 55 1444 -0.62 55.5 1438 -0.53 56 1432 -1.28 56.5 1427 -1.23 57 1421 -1.24 57.5 1415 -1.16 58 1409 -1.08 58.5 1403 -0.88 59 1398 -0.56 59.5 1392 -1.15 60 1386 -1.23 60.5 1380 -0.97 61 1374 -0.64 61.5 1368 -0.89 62 1362 -1.11 62.5 1356 -1.23 63 1349 -0.91 63.5 1343 -0.69 64 1336 -0.51 64.5 1329 -0.94 65 1322 -0.67 65.5 1315 -2.13 66 1308 -1.44 66.5 1301 -1.46 67 1293 -1.67 67.5 1286 -1.65 68 1278 -2.04 68.5 1270 -2.42 69 1262 -2.53 69.5 1253 -2.37 70 1245 -2.25 70.5 1236 -2.38 71 1228 -2.68 71.5 1219 -2.8 72 1210 -2.48 72.5 1201 -2.79 73 1192 -3.19 73.5 1183 -2.63 74 1174 -1.76 74.5 1165 -2.72 75 1156 -2.41 75.5 1147 -2.34 76 1138 -2.52 76.5 1129 -2.76 77 1120 -2.34 77.5 1112 -3.25 78 1103 -2.49 78.5 1095 -2.85 79 1087 -2.82 79.5 1079 -2.51 80 1071 -2.35 80.5 1063 -2.56 81 1056 -2.08 81.5 1049 -2.56 82 1042 -2.35 82.5 1036 -2.24 83 1030 -2.87 83.5 1024 -3.07 84 1018 -2.23 84.5 1013 -2.27 85 1008 -2.25 85.5 1003 -1.56 86 998 -1.31 86.5 994 -1.26 87 990 -1.39 87.5 986 -1.48 88 982 -1.09 88.5 978 -1.38 89 974 -1.44 89.5 970 -0.97 90 967 -1.16 90.5 963 -1.09 91 960 -1.21 91.5 957 -1.37 92 953 -1.1 92.5 950 -1.52 93 947 -1.57 93.5 943 -1.51 94 940 -1.22 94.5 937 -1.72 95 933 -1.46 95.5 930 -1.19 96 927 -1.11 96.5 923 -1.26 97 920 -1.15 97.5 917 -0.91 98 913 -1.37 98.5 910 -1.34 99 906 -1.43 99.5 903 -1.36 100 899 -1.43 100.5 895 -1.32 101 892 -0.92 101.5 888 -1.08 102 884 -1.47 102.5 880 -1.36 103 876 -1.3 103.5 872 -0.8 104 867 -0.78 104.5 863 -0.72 105 859 -0.8 105.5 854 -0.78 106 849 -0.55 106.5 845 -0.78 107 840 -0.12 107.5 835 -0.19 108 830 -0.31 108.5 825 -0.48 109 819 -1.17 109.5 814 -1.11 110 809 -1.15 110.5 803 -2.19 111 797 -1.56 111.5 792 -2.2 112 786 -2.11 112.5 780 -1.45 113 774 -2.19 113.5 768 -2.51 114 762 -2.19 114.5 756 -2.69 115 750 -3.59 115.5 744 -3.36 116 737 -3.45 116.5 731 -3.91