Aleutian Low Pressure Index (ALPI) correct URL: http://www.pac.dfo-mpo.gc.ca/science/species-especes/climatology-ie/cori-irco/indices/alpi.txt In order to make use of this index, you are requested to cite the original manuscript (below). For more information about this index, please see the original manuscript, or contact Dr. Jackie King (KingJac@pac.dfo-mpo.gc.ca). This index measures the relative intensity of the Aleutian Low pressure system of the north Pacific (December through March). It is calculated as the mean area (km2) with sea level pressure <= 100.5 kPa and expressed as an anomaly from the 1950-1997 mean. A positive index value reflects a relatively strong, or intense Aleutian Low. Correct citation: Beamish, R.J., C.E. Neville and A.J. Cass. 1997. Production of Fraser River sockeye salmon (Oncorhynchus nerka) in relation to decadal-scale changes in the climate and the ocean. Can. J. Fish. Aquat. Sci. 54: 543-554. YEAR ALPI 1900 1.56 1901 -0.2 1902 -0.02 1903 -4.59 1904 0.05 1905 -1.23 1906 -0.28 1907 -3.79 1908 -1.78 1909 0.1 1910 -2.75 1911 -2.39 1912 -0.18 1913 -1.39 1914 0.62 1915 -1.63 1916 -2.43 1917 -2.35 1918 1.3 1919 3.12 1920 -2.34 1921 -0.17 1922 -3.19 1923 -2.03 1924 1.17 1925 -0.76 1926 4.34 1927 1.2 1928 1.15 1929 1.55 1930 -2.22 1931 2.94 1932 -2.35 1933 -3.1 1934 2.98 1935 -1.09 1936 2.74 1937 -3.4 1938 -0.3 1939 0.58 1940 6.57 1941 5.71 1942 2.14 1943 -3.05 1944 1.58 1945 4.8 1946 3.05 1947 -2.28 1948 -2.68 1949 -1.1 1950 -1.97 1951 -1.44 1952 -2.93 1953 2.39 1954 -2.41 1955 -2.65 1956 -3.97 1957 -1.72 1958 2.37 1959 -2.19 1960 -0.47 1961 3.06 1962 -1.81 1963 2.51 1964 0.73 1965 -1.71 1966 -1.8 1967 -0.17 1968 -0.33 1969 -2.76 1970 3.79 1971 -2.34 1972 -4.59 1973 -1.93 1974 1.05 1975 -1.99 1976 -1.16 1977 3.08 1978 2.35 1979 -1.16 1980 1.69 1981 4.93 1982 -3.41 1983 7.15 1984 1.53 1985 -1.73 1986 5.39 1987 3.55 1988 1.16 1989 -2.72 1990 -0.92 1991 0.36 1992 2.09 1993 -1.1 1994 -0.64 1995 1.52 1996 0.8 1997 0.54 1998 4.71 1999 0.01 2000 0.15 2001 1.50 2002 5.57 2003 2.93 2004 2.55 2005 0.31 2006 0.06 2007 -0.28 2008 -1.52