JISAO data

Southern Oscillation Index derived from marine observations
1800* - March 2008: analyses | digital values

A version of the Southern Oscillation Index (SOI) is presented here that is derived from ship-of-opportunity sea-level pressure (SLP) data contained in the Comprehensive Ocean-Atmosphere Data Set (COADS). The Southern Oscillation (SO) is an primarily an east-west pressure difference that dominates the year to year climate variability of the tropics. The SO can be seen in the following map of the correlation of monthly-mean SLP anomalies with a time series of the eastern equatorial Pacific SST anomalies.

Correlation of SLP and eastern equatorial Pacific SST anomalies, 1950-79
Tropical
domain.
big GIF | PDF | PNG | PS
Red and blue shading indicates positive and negative correlations, respectively. The SO is characterized by SLP anomalies of one sign in the Pacific to the east of the dateline, and anomalies of opposite sign throughout the remainder of the tropics. A netCDF file of the correlation and associated regression maps (regressed onto the normalized SST index) are linked here.
Regression of SLP anomalies onto normalized eastern equatorial Pacific SST anomalies (mb)
Tropical
domain.
big GIF | PDF | PNG | PS
The correlation map is used to define tropical ocean regions of like-signed SO-related SLP anomalies and to provide weights for the contribution of each gridpoint to the index. A "Tahiti" time series is calculated as the average SLP anomaly over the regions of negative correlations shown above, weighted by both the correlation value at each gridpoint and by the number of observations for that gridpoint in each year and month, and is named after the island at (18S, 150W). A "Darwin" time series is calculated in a similar manner for the regions of positive correlations, and is named after the station at (13S, 131E) in northern Australia. The station data at Tahiti and Darwin have traditionally been used to define the SO.

The "Tahiti" and "Darwin" indices are calculated using data within 20-degrees latitude of the equator, and the "SOI" index is defined as the difference of the two, "Tahiti" minus "Darwin." Indices calculated using a broader band of latitudes are not as well correlated with eastern Pacific SST. The choice of latitude band is important for the "Tahiti" index and not for "Darwin." The anomalies are with respect to 1950-79.

"Darwin"(mb), "Tahiti" (inverted), "Darwin" minus "Tahiti", and CTI(C), 1870-2008
Image of time series.
Big GIF | PDF | PNG | PS
The indices have been smoothed with the filter suggested by Trenberth (1984, Signal versus noise in the Southern Oscillation, Mon. Wea. Rev.), and anomalies are with respect to 1979. The sea surface temperature timeseries is the cold tongue index.

* Cleaning up the early marine SLP record is an ongoing project by many different groups. See my contribution to Workshop on Advances in the Use of Historical Marine Climate Data (MARCDAT-I). There is a low bias in the 1800s which is related to the absence of an adjustment of marine pressure measurements to sea-level, and the high pressure for the "Tahiti" series in 1916-17 is not accompanied by large changes in "Darwin" or the cold tongue index. I am providing the entire record, but for now it would be wise to only use the "SOI" and "Tahiti" values beginning in 1920 and the "Darwin" values beginning in 1890.

"Darwin"(mb), "Tahiti" (inverted), "Darwin" minus "Tahiti", and CTI(C), 1935-2008
Image of time series.
Big GIF | PDF | PNG | PS
Climatology and smoothing as above.

Times series in 4-column format (year, calendar month, SLP in mb., number of observations (Missing values are NaN.):
"SOI" (mb) 1920-present, see * above
"Tahiti" (mb)1920-present, see * above
"Darwin" (mb)1890-present, see * above

Digital values of the indices in hundredths mb.
Missing data are indicated by blanks. Number of observation information is given with the "Tahiti" and "Darwin" indices.

"SOI" | "Tahiti" | "Darwin"


"SOI"
       JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
 1920  -47  -67  -13  -60  -89  -34  -29  -59   53  -50   54   52
 1921   56  119  112   37   89   72   62   41   54   26  -49   70
 1922   32   80   76   42  -27   69   40   -3   56   28   33  123
 1923   23   88    7  116  -51  -41  -21  -14    0  -52  -50   27
 1924 -108  121   34   77   28   70   64   43   21   34   72   27
 1925  136   48  107  -16  -20  -36  -40  -22  -64 -102  -54 -180
 1926  -95  -62  -42  -55   -9  -37   -3  -28   19  -71   35   81
 1927   98   80  132   56  -37   17   31  -38    3  -65  -76  -26
 1928   78   13   83   33  -45  -14  -59   33   12  -33   41   63
 1929  -36   36   62   20   12   14  -54  -42  -42  -80  -89   10
 1930  -28  -51  -54  -19 -105  -82 -135  -89 -144  -85 -132 -183
 1931  -76  -90 -114  -96  -50  -52  -96   28    9  -65  -31  -16
 1932  -94  -86  -39 -178  -71 -105  -14  -74  -23    7    6   19
 1933   16   88   56  -29  -22   20   -6   -1   18   51  130  200
 1934  169  194  133   53  -27  -20   22  -26  -19   41  -36   -4
 1935  -25  155  100   22    9   35   22  -19   21    0  -12   -9
 1936 -102   -6  -58   22  -16  -60  -35  -84   46  -14 -102   51
 1937  -61   34    7   -3  -39   75   63   34    0  -56   15    1
 1938    4   87  173   71   69   55   80   46   73   74  -17   78
 1939  -27   31  117   20  -23  -26  -15   43   41  -15   26 -103
 1940    8 -104  -19  -47   25  -59    8   42  -90  -37   -5 -138
 1941  -39 -130  -90  -84 -126    4  -73   -7  -92  -84 -100 -141
 1942  -70 -117  -35   20   72   98  111  114   48   58   65  157
 1943  -19  -32  -51 -121    4  -48  -98   39   -3   46  -20  104
 1944  -65  -74  -48  -14   -5  121  -58    7   63   45   82   10
 1945  184   83   90  132  111   30   67   35 -173 -113   47   38
 1946   92   36   15  -20    1   13   -2   58  -59  -71   10  -45
 1947   -7   78  -27   83   11  -13   62   57  180   10   76   36
 1948  -37  -70  -47   22  -78    3   26    8  -28   30 -119   50
 1949   58   53  -18  -13   51   53   72   27   64   66   60   72
 1950  154  107  149  117   72  114  127   49   21   38   87  -46
 1951  149   70   35  -17  -76  -40  -77  -94  -61   -3   -1   33
 1952  -21   33   37  -38   10   -7   37   37  -22   23    7  -57
 1953   41  -77  -14  -74 -125   25  -14  -52  -39   26  -25  -21
 1954   76   94  -29   41   -7   42   30   86   47   39   42  106
 1955    4  109   79   43  102   86   20   51   96  100   91  128
 1956  127   62   50   61  107   32   40   59   69   82   43   15
 1957   74 -133  -42  -55  -91  -89 -110  -58  -82  -41 -146  -48
 1958 -176  -76 -200 -112 -129  -68  -59  -33  -42  -40  -77  -71
 1959  -81  -72  -31  -51   42  -34  -13   33   46  -42   66  -31
 1960   43   -4   70    7   12    3    0   59   24    7   30   79
 1961  -68   50 -121    0   34    7   45   43   47  -37    2   98
 1962  147   -4   26   50   82   -2   60  -27    8   35   35   28
 1963   69   56   -9   15   37  -57  -19  -38  -70 -113  -20  -59
 1964  -71  -94  -31   76   57   62   12   88   55   80   34   59
 1965  -10  -27  -44   18  -65 -137 -128 -125  -90  -79 -136  -99
 1966 -273  -99  -24   33    3  -53  -17   15   -9  -22   83  120
 1967   16   75   99   48   70   59   88   53   41  -29   10  -43
 1968   29   -6  164   52   16   56   50   56   26  -38   -6   10
 1969  -57 -107  -45  -69  -67  -90  -70 -160  -54  -74  -53  -55
 1970  -24  -25   15  -51   52   25    6   18   70   63  150   23
 1971   43  118   30   81   66   81   11   20   54   36   -1  -11
 1972  -38   38  -52  -88 -126  -94  -70 -123 -121 -131 -116 -106
 1973 -166  -91  -68   -6   29   48   66   66   58  116   97  182
 1974  135  120  115   32   27   17   70   22   46  102   26    9
 1975  -35   47    8   51   57   67  108  140  112  140   59  167
 1976   54  125   31  -53  -55  -91 -119  -77  -86  -59  -23 -125
 1977  -54  -64 -194    1  -65   -5   22  -29   -7  -69  -84 -123
 1978  -27 -215    2  -41   13   56  -13   -6  -23  -16 -118  -56
 1979  -59   -8   -5  -73  -83  -15  -86  -71 -115  -95  -55 -107
 1980  -67  -59 -238 -150 -132 -116  -90  -75  -39  -41    7   26
 1981  -11 -113  -48  -52   -7  -31   22  -18   12  -14   16 -100
 1982   -8  -46  -66  -65 -138 -148 -107 -131 -126 -115 -193 -203
 1983 -361 -315 -269 -194 -226 -176 -151  -21   -5   14  -71   14
 1984   82    6   -7   40   23   39   -6   63  -28   -2   39  -22
 1985   99  146  -24   73   27  -63  -30   44   12  -75  -15   46
 1986   19    1   20  -48  -82   15  -43  -56  -84  -12 -144 -137
 1987 -184 -329 -151 -173 -205  -90 -219 -144  -51  -84  -61 -131
 1988   13  -44   70   19   31   48   91   20  139   95   53   97
 1989  138   80  150   24   92   36   83   21  -14   36  -55   32
 1990 -109   28  -63   17   14  -57   11   29  -14    8  -46  -13
 1991   29  -70  -43  -17  -72  -49  -25   10  -80  -70 -160 -117
 1992 -268 -170 -219 -168 -156 -136 -107   -5  -57  -57 -124 -133
 1993  -98  -91  -77 -188 -145 -167  -68 -137  -68  -92   30  -22
 1994   32   28  -38   -9 -105   23  -22  -54  -86 -113  -65 -152
 1995 -117  -14  -18  -88  -31  -28    3  -53   -7   25   64   -1
 1996   79   19   81   74    6    5   55    0   36  -17  -13    0
 1997   82  -63  -43  -98 -146 -190 -159 -171 -233 -287 -211 -249
 1998 -308 -271 -193 -134  -62  -29   15   20   30   59   89  105
 1999  188   67  121   75    3   -4   40  -47   -4   36  104  176
 2000  196  271  130  140   -1    3   38   -1   31   40   89  100
 2001  179   51   -5  -39  -30   -1    3   -5   23   10   63 -125
 2002   28  -46  -36   23 -102  -81  -98 -117 -125 -113  -90  -86
 2003 -129  -78  -99   -4  -44    2  -39  -12  -32  -21  -45  -41
 2004    2   47    6   25   -6 -104  -39  -20  -44  -31  -50   -8
 2005  -56 -203  -32 -129  -89  -71  -89  -51   -2  -62   -4   25
 2006   22  -24  105   59  -22  -48  -47  -87  -24 -100  -28   -2
 2007 -133   21  -10   36    7  132   83   61  153   65   53  230
 2008  151  193  223                                             

"Tahiti"

       JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
 1920    7   29   21  -14   16  -11   30   60   47    9   10   34
 1921   77   97   72   81   49    7   66   33   89   45   45   70
 1922   -5   32   99   47   35   45   59  -23    9   14   12  128
 1923  -10  119   28   77  -37   -5    8   55    9  -14  -36   -8
 1924  -50  120   -2   21   32   79   49   70   63   18   69   57
 1925   76   73   56   22  -25  -53   41  -27   -3  -20   17  -86
 1926  -16   21   56   54   23    8  -21   19  -22 -128   28    9
 1927   53  148   84   37   36   63   64   12   -1   -7  -55  -13
 1928  102   90   97   -1   11  -79  -40  103   14  -21   74   18
 1929  -66  -37   30   46   36   40  -24  -23  -37  -67 -139  -48
 1930  -11   71  -29  -16    2  -68 -121  -22  -65  -41  -19 -134
 1931  -59  -69  -20  -53    8   25  -65    8    8  -48  -45  -34
 1932   -4  -21  -10 -127   -9  -67  -48  -65  -28  -24    3   31
 1933  -30    6   -4   -2   18   24    6   44    8  -12   68  121
 1934   72  172   60   34   36    7  -18   24  -20   56  -21    6
 1935   -5  157   72  -32   25   10  -32    3  -23  -55   17  -22
 1936 -123    5  -65    6  -91  -36  -35  -91    8    1  -76  -14
 1937 -137   31 -112  -51   -4   26  -12  -28   38  -19  -48  -71
 1938  -37   53   54    7  -17   37   41  -32   34   50  -34  -27
 1939  -45   39   64   18  -39    1  -41  -71   34  -47  -59   -7
 1940  -19  -54  -62  -23  -61  -46    2  -18  -72   26  -82 -116
 1941   -3  -60  -84 -103 -125   37  -13   -9  -69  -20  -74  -63
 1942   51  -80  -24   95   53   45   85   74   71   17   40  138
 1943   69   61   14    5   28  -10  -62   25   -8   79   15  165
 1944   31   -3   10   41   29  122   61  122   77   67   94  -55
 1945  112   78   35   76  136   14   78   84  -78  -51   30    8
 1946   87  -26    2   14   10   -2  -14   27  -43  -65  -50 -127
 1947  -84   19   -5   54   35    5   39   33  149    4   52  -49
 1948  -44  -12  -41   27  -89   18  -15  -42  -42   34  -96  -14
 1949   78   40  -44   37    6   37   64   31   29   42   53  -52
 1950   40   71   99   19   24   45   69   18   20   -9  -24  -64
 1951  100   13   -7   -7   -1  -51  -53  -32  -33  -17  -37   40
 1952   11  -15  -25    5    5   15   56   31    5   13  -15   27
 1953   75   -1  -13  -42  -50   -1   26  -29  -25   25   19  -14
 1954  -28   88  -22   34  -47    5   -2   29   -8   40   81   19
 1955   72  -32   -1  -17   56   56    8    0   30   39   11   76
 1956  -12  -35   14  -20   19   20   63   60   -7   48   30    6
 1957   74 -113    6  -21  -46  -69  -81  -58  -32   17  -70  -35
 1958  -59  -11 -153  -69 -105  -65  -55  -22  -59  -60  -33    2
 1959  -20   10   25  -48    0   -5   12  -19   -4  -34   -4  -54
 1960   57    5   39  -14  -18   -9   19    2   10   19   68  104
 1961   -6    7  -49   -8   45   -4   33   38   20  -51   41   44
 1962   94   47   25   60   60   35   13   83   22   62   45   90
 1963   48  137   21   24   30  -12  -19  -43  -49  -15   38   -9
 1964   -2  -95    6   48   28   27   17   37   13   57  -13   31
 1965   -5 -110    5   39  -69  -31  -78  -62  -50  -19  -63 -121
 1966 -186  -99  -91  -11   31   19  -62   12   13  -16    6  -25
 1967   -1   51   54   62   46   -1   28   28   55   15    8   32
 1968   -8   46  126   89   39   98   70   72   24   -6   58  -11
 1969 -163 -139  -22  -39  -81  -71  -35  -87 -103  -70  -47  -33
 1970   36   -5  -22   -6   51   39   47  -36   -7  -43   81  -63
 1971   -7   -2   -3   20   35   70  -31   36   35   38   41  -54
 1972  -74  -10  -19  -36  -90 -102 -124  -83  -51  -47  -70  -37
 1973  -79   -2  -25  -23   56   19   32   54  127   13   70  162
 1974   54   31   94   14   39  -34   79  -19   43   36  -27  -21
 1975  -23   81    8    3   20   43   72   74   81   56   47  103
 1976   23  104  -26   13   14  -84  -39   -4  -21  -41  -57 -138
 1977  -78    1 -102    1  -26   -2  -48  -10   15   18  -38  -45
 1978   81  -45   48  -14  -32   31  -49   -3    5  -22  -58   12
 1979  -15   23   11  -54  -32   19   30  -66  -69  -45  -89  -24
 1980  -57  -25 -181 -137  -88  -70  -38    7   10   22   32   14
 1981   71  -66   40   -8    2   -9   25  -16   41   -3    8  -26
 1982   25  -10  -53   -4  -69  -64  -79  -53  -25  -51 -153 -117
 1983 -191 -143 -127 -132 -168 -129 -117   40   39    5   50   91
 1984   65  -82    2   14    1   -2  -31   32    2   20   75 -116
 1985  111  -15  -42   -6  -24  -38   25   39   12  -63   -3   54
 1986   20   26   43  -51  -62  -43   63  -78   -4   96  -89  -21
 1987  -46 -154  -76  -75  -89  -54 -129  -79   24  -39  -48  -49
 1988   39  -57   38   28   22   75   96   40   71   11   74  123
 1989   52  117  113  -17   81   90   98   29  -32   46  -23  110
 1990  -92  124   41    0  -32  -45   57   55   28   38  -41   10
 1991   55    3  -27  -22  -35  -35    9   48  -12  -87  -61  -65
 1992  -85  -55  -86 -113 -127 -165    8   38  -76  -58 -100  -56
 1993   -3    0   33  -88  -74  -99  -25   -5   15  -24    0  -41
 1994   -1  -11   32   12  -44   -4  -29   11  -19  -66   -8  -43
 1995   -6   72    1 -110   -4  -27  -42  -27   45  -50   47   58
 1996   16  -32   18   22   69   23   46   35  -56  -39  -84  -35
 1997  106  -66   14    7  -76 -111 -119  -76  -70 -114  -55 -136
 1998 -211  -74 -105  -63  -21    8   55   35   10   14   13   68
 1999   79   80  -43   31   16   21   25   33   14   36   40  111
 2000  101  190   28   43   -4   -4   -4  -43   25  -37  -30   -1
 2001   79  -91  -18  -46  -15  -58   -8   -2   21  -29   17  -70
 2002   41   40  -48  -35 -120  -72   15  -67  -26 -133  -60   -2
 2003  -20  -68  -59    1  -26    5    5   32   29  -33  -44   -9
 2004   49   52  -29   31   18    2   12   32   25   -1  -16    3
 2005  -24  -58   70  -53  -64  -82  -33    2    2  -21   -8   35
 2006   -6    3   54  -10    4  -43   -9  -79    9  -34  -51   24
 2007  -52   19  -44   19  -15  -24   45   17   73    3  -20  113
 2008   63  136  130                                             

"Darwin"

       JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
 1890  -89 -149 -144  -66  -18  -19   -3    8  -10  -15   35  -11
 1891  -31   34   -7    2   48   57   77   89   47  -99   -4   12
 1892  -50 -121 -126  -86   36   18   62  -47   52  -26  -84  -35
 1893 -129  -20   11    8  -29  -78  -89   55  -46  -92   -2  -69
 1894  -74   24   29  -13  -26  -36   -9   13   21  -47   12   39
 1895  -59  -45 -104   35   64   76   42  -64   -6  -90   10  -48
 1896  -12  104  -50  -88   67   35   89  103  -12  -12  -50   70
 1897   18   42  -53   17  -14   -2  -11  -36   43   68   18   19
 1898  -38 -131 -103  -11   -4    8   13   13  -10  -31 -127   -1
 1899  -11  -39  -32   -2   31  -27  -27   -1  142   11   64  -15
 1900  -27   38   58   64   98   89  -33   20   43   -1  -87  -10
 1901   27   46   18  -94  -22   35  -72  -28   45  -31  -44    3
 1902  -40  160  -65   -5  -16   -7   33    7   49   97   66   14
 1903   61  185   -3  -21   11   15  -14    4   25  -23   18  -89
 1904  -32  -13  -50  -22    6  129   23   96   83  -48   96   33
 1905   88   81   68  107   40   54   62   41   -2  -24   98   20
 1906   -8  -21   36   41    4   -6  -59   15  -21  -11   38    0
 1907  -34  -12   -6  -61   39  -19  -25   77   25   10  -41  -10
 1908   90    7    7  -34  104   96   61   14  -25  -24   -7  -25
 1909  -60    4  -36  -34    3   15   25   46  -36  -35   20  -70
 1910  -91  -92  -93  -37   46  -82  -53  -98 -107   -4  -31   -9
 1911  -50   76   30   70   28  105  113   11  -14  101   37  -15
 1912   89   65   44   70   64   45   -2  -17   40   55   16   27
 1913   97   43  -15   -5    7   27   56   79   69   83   97  122
 1914  125  130   86  109  107   55  -15   82   73  115   -5   62
 1915  120   45  150   79   10  -17   49   49  -20  -70   -9   72
 1916   81  -25    4   21   24  -44    8   74  -87  -75  -53 -131
 1917   28   17  -25  -69  104   37    4    4  -25  -59   14  -77
 1918   -7  153  107   23   27   94  106  180  120   97   69  122
 1919  157  128  187   34   18   46   36  100   48   75   -3   42
 1920   53   96   33   46  104   23   59  119   -6   59  -43  -18
 1921   22  -21  -40   44  -41  -66    4   -8   34   19   94    0
 1922  -36  -48   23    6   62  -24   20  -20  -47  -14  -21    5
 1923  -33   32   21  -38   14   36   30   69    9   38   14  -36
 1924   58   -1  -36  -56    3    8  -14   27   42  -15   -3   31
 1925  -60   25  -51   38   -4  -17   81   -5   61   82   72   95
 1926   79   83   99  109   32   45  -18   47  -41  -57   -7  -72
 1927  -45   68  -48  -19   72   46   33   50   -4   58   21   13
 1928   24   76   14  -34   56  -66   19   70    2   12   33  -45
 1929  -30  -73  -32   26   24   26   30   19    5   13  -50  -58
 1930   17  122   26    3  107   13   14   67   79   44  113   49
 1931   17   21   93   43   58   77   31  -20   -1   17  -14  -18
 1932   91   65   29   51   62   37  -35    9   -4  -32   -4   11
 1933  -45  -83  -60   27   40    5   13   44   -9  -63  -62  -79
 1934  -97  -22  -73  -19   63   27  -40   50   -1   15   15   10
 1935   21    2  -28  -54   17  -24  -54   22  -44  -55   29  -13
 1936  -21   10   -7  -16  -74   24    0   -6  -38   15   26  -66
 1937  -75   -3 -119  -48   35  -48  -75  -62   38   37  -62  -72
 1938  -41  -34 -119  -64  -86  -18  -39  -78  -39  -24  -17 -105
 1939  -18    8  -53   -3  -16   27  -26 -113   -7  -33  -85   95
 1940  -27   51  -44   24  -86   13   -7  -60   18   63  -77   22
 1941   36   70    6  -19    1   33   60   -2   23   64   26   78
 1942  121   36   11   75  -19  -53  -26  -40   23  -40  -26  -20
 1943   88   93   65  126   25   38   37  -14   -5   33   35   61
 1944   96   71   58   56   34    1  119  115   13   22   12  -64
 1945  -72   -6  -55  -56   26  -16   11   49   95   62  -17  -30
 1946   -5  -62  -13   34    9  -15  -12  -31   16    6  -60  -81
 1947  -77  -58   22  -29   23   18  -22  -24  -31   -7  -23  -85
 1948   -7   59    6    5  -11   15  -41  -50  -14    4   23  -64
 1949   19  -13  -26   50  -45  -16   -8    5  -35  -24   -7 -124
 1950 -114  -36  -49  -99  -48  -70  -58  -31   -1  -48 -111  -18
 1951  -49  -57  -43    9   75  -11   23   62   28  -15  -36    7
 1952   32  -47  -62   43   -5   23   20   -7   27  -10  -22   84
 1953   34   75    1   32   76  -26   40   23   14   -2   44    7
 1954 -104   -6    7   -7  -40  -37  -32  -57  -56    1   39  -88
 1955   68 -141  -80  -59  -45  -30  -13  -50  -66  -60  -80  -52
 1956 -139  -98  -36  -81  -88  -12   23    1  -76  -34  -13   -9
 1957    0   20   49   34   46   20   29    0   50   59   76   12
 1958  116   64   47   42   24    3    4   11  -17  -20   44   73
 1959   61   82   56    3  -42   29   25  -52  -50    8  -69  -23
 1960   14    8  -31  -21  -30  -12   19  -58  -13   12   38   26
 1961   62  -43   71   -9   12  -11  -13   -5  -27  -13   39  -55
 1962  -53   51   -1   10  -23   37  -47  110   14   27   10   62
 1963  -21   81   30    9   -7   45    0   -6   20   98   58   50
 1964   69   -1   37  -28  -29  -35    5  -50  -42  -23  -47  -28
 1965    5  -83   49   20   -4  107   50   63   40   60   74  -22
 1966   86    1  -67  -44   27   72  -45   -2   21    6  -77 -145
 1967  -17  -24  -45   14  -24  -59  -60  -25   14   44   -3   75
 1968  -37   52  -39   36   23   42   20   16   -2   31   65  -20
 1969 -105  -32   24   30  -15   19   34   73  -48    3    6   23
 1970   61   20  -37   45   -2   14   41  -53  -77 -106  -69  -86
 1971  -50 -121  -33  -61  -31  -12  -42   16  -19    3   41  -43
 1972  -36  -47   33   52   36   -8  -54   39   70   84   46   69
 1973   87   89   44  -17   27  -29  -34  -12   69 -103  -28  -20
 1974  -81  -88  -21  -18   11  -51    9  -41   -3  -66  -52  -30
 1975   12   34    1  -48  -37  -24  -36  -65  -30  -84  -11  -63
 1976  -31  -21  -58   66   69    7   79   73   65   18  -33  -13
 1977  -23   64   92    0   40    3  -69   19   21   87   47   79
 1978  108  170   46   27  -44  -26  -36    3   28   -6   60   68
 1979   44   31   16   19   51   34  117    5   45   50  -33   83
 1980   11   34   57   13   44   46   52   82   49   63   25  -12
 1981   82   48   88   43    9   22    3    2   30   12   -8   75
 1982   33   36   13   61   70   83   28   78  101   64   39   85
 1983  170  172  142   62   58   47   34   61   44   -9  121   76
 1984  -17  -88    8  -26  -22  -41  -25  -31   30   22   36  -93
 1985   12 -161  -18  -79  -51   25   56   -5    0   12   12    8
 1986    1   25   23   -3   21  -58  107  -22   80  107   55  116
 1987  137  175   75   98  116   36   90   65   76   45   12   82
 1988   25  -13  -31    9   -8   27    5   20  -68  -84   22   26
 1989  -86   37  -37  -41  -11   54   15    8  -19   10   32   78
 1990   17   96  104  -17  -46   13   46   27   42   30    5   23
 1991   27   72   15   -5   38   14   33   38   67  -16  100   53
 1992  184  115  133   55   29  -29  115   44  -18   -1   24   77
 1993   95   91  110  100   71   68   43  133   83   68  -30  -18
 1994  -32  -39   70   21   61  -27   -7   65   67   46   57  109
 1995  111   87   19  -22   28    1  -45   26   52  -75  -17   59
 1996  -63  -51  -63  -52   64   18   -9   35  -92  -22  -71  -36
 1997   24   -3   57  105   70   80   40   95  162  173  155  113
 1998   98  197   88   70   41   37   40   15  -20  -44  -76  -38
 1999 -109   14 -164  -45   13   25  -14   80   18    0  -64  -65
 2000  -95  -80 -101  -97   -3   -8  -41  -41   -5  -77 -119 -101
 2001 -100 -141  -13   -7   14  -57  -11    4   -1  -39  -45   55
 2002   14   85  -12  -57  -18    8  113   50   99  -20   29   84
 2003  109   10   40    5   18    3   44   44   61  -12    1   32
 2004   47    5  -35    6   24  106   50   52   69   30   34   11
 2005   33  145  102   76   25  -12   57   53    4   41   -4   11
 2006  -28   26  -51  -69   25    5   38    8   33   65  -23   26
 2007   81   -3  -34  -17  -22 -156  -38  -44  -80  -62  -73 -118
 2008  -88  -57  -93                                             



May 2008
Todd Mitchell
(mitchell@atmos.washington.edu)
JISAO data