January-February-March mean Arctic Oscillation (dimensionless)
    1 -999
 1890 2002
January-February-March mean Arctic Oscillation (dimensionless)
Values * 100.  Standardized with respect to 1950-99.
http://jisao.washington.edu/data/aots/   -999 for missing.
 1890 2002    3
        +0    1    2    3    4    5    6    7    8    9
 1890 -999 -999 -999 -999 -999 -999 -999 -999 -999  -15
 1900 -143    6  -23  179   45   85    2   82   47  -71
 1910   81  102  -38  134   88 -116   42  -42   49 -100
 1920  159  104   22   47  -86   53   31   60   90  -63
 1930   67 -103   28  -44   86   85 -176  -12  122   36
 1940 -164 -125  -82   93   50  -57  -11 -176  137  120
 1950   44  -50  -85   45   52 -110  -53  -17 -149   91
 1960 -160   24  -23  -89   13  -94 -147  108   11 -211
 1970 -142  -46   27  121    3   92  103 -125  -30  -84
 1980  -86   -8   58   35  -14  -84   16  -78    4  257
 1990  238   21  137  187   41   82  -26  120  -19   -2
 2000   93  -59  133 -999 -999 -999 -999 -999 -999 -999