tpi.had2-yr-mo. TPI unfiltered (IPO Tripole Index) of Henley et al. (2015) HadISST2.1Median_of_10_rsns Please cite this data if you use it: Henley, B.J., Gergis, J., Karoly, D.J., Power, S.B., Kennedy, J., & Folland, C.K. (2015). A Tripole Index for the Interdecadal Pacific Oscillation. Climate Dynamics, 1?14. doi:10.1007/s00382-015-2525-1 See http://www.esrl.noaa.gov/psd/data/timeseries/IPOTPI/ year TPI (IPO) 1870 -1.013 1871 -0.204 1872 -0.333 1873 -0.792 1874 -0.921 1875 -0.685 1876 -0.483 1877 1.399 1878 0.649 1879 -0.871 1880 -0.672 1881 0.132 1882 -0.402 1883 -0.073 1884 0.422 1885 0.667 1886 -0.482 1887 -0.296 1888 1.029 1889 -0.003 1890 -0.978 1891 0.130 1892 -0.934 1893 -1.143 1894 -0.672 1895 0.333 1896 0.808 1897 0.365 1898 -0.376 1899 0.343 1900 0.743 1901 0.271 1902 1.192 1903 0.234 1904 0.497 1905 1.254 1906 0.343 1907 -0.048 1908 -0.081 1909 -0.677 1910 -0.759 1911 0.075 1912 0.566 1913 0.433 1914 0.793 1915 0.645 1916 -1.149 1917 -1.102 1918 0.159 1919 0.618 1920 0.129 1921 -0.355 1922 -0.250 1923 0.249 1924 -0.578 1925 0.314 1926 0.909 1927 0.083 1928 0.243 1929 0.355 1930 0.980 1931 0.874 1932 0.394 1933 -0.606 1934 -0.025 1935 0.143 1936 0.352 1937 0.160 1938 -0.675 1939 -0.009 1940 1.111 1941 1.459 1942 -0.283 1943 -0.574 1944 -0.284 1945 -0.330 1946 -0.003 1947 0.173 1948 -0.155 1949 -0.545 1950 -1.219 1951 0.070 1952 -0.255 1953 0.257 1954 -0.550 1955 -1.401 1956 -1.125 1957 0.438 1958 0.403 1959 0.098 1960 -0.113 1961 -0.363 1962 -0.783 1963 -0.011 1964 -0.632 1965 0.603 1966 0.294 1967 -0.468 1968 -0.144 1969 0.496 1970 -0.640 1971 -1.151 1972 0.494 1973 -0.737 1974 -0.907 1975 -1.162 1976 -0.122 1977 0.351 1978 -0.095 1979 0.220 1980 0.255 1981 -0.082 1982 1.001 1983 1.022 1984 -0.234 1985 -0.357 1986 0.403 1987 1.312 1988 -0.668 1989 -0.731 1990 -0.104 1991 0.336 1992 0.782 1993 0.845 1994 0.453 1995 0.057 1996 -0.253 1997 1.199 1998 0.033 1999 -1.289 2000 -0.896 2001 -0.503 2002 0.264 2003 0.229 2004 0.106 2005 -0.187 2006 0.139 2007 -0.525 2008 -0.822 2009 0.126 2010 -0.648