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.
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.
* 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.
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"
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