"GR" and "CT*" time series

"GR" and "CT*" timeseries

This WWW page provides plots and values of the GR and CT* timeseries from Zhang, Wallace, and Battisti (1997). The details of how G and the cold tongue index (CTI) are calculated are described on other WWW pages (G|CTI). G and the CTI are correlated at 0.88 for 1900-2005 and although G has a little more low-frequency variaiblity, the two look pretty similar. CT* is the high-pass version of the CTI, for which only periods shorter than 6 years have been removed. GR is G minus the signal it has in common with CT*, so it has periods longer than 6 years.

Big GIF | PNG | PS
Update of Fig. 10 in Zhang et al. Both series smoothed with successive 9- and 5-month running means to simplify the plot. Ordinate ticks 1 standard deviation.

Regression of SST anomalies onto CT* and GR

Big GIF | PNG | PS

Update of Figs. 12a and 12b, respectively, of Zhang et al. A netCDF file of the maps: Map 1: correlation of CT* and SST; Map 2: regression of SST onto normalized CT* (C); Map 3: correlation of GR and SST; and Map 4: regression of SST onto normalized GR (C).

Big GIF | PNG | PS

A netCDF file of the maps: Map 1: correlation of CT* and SST; Map 2: regression of SST onto normalized CT* (C); Map 3: correlation of GR and SST; and Map 4: regression of SST onto normalized GR (C).

Reference:
Zhang, Y., J. M. Wallace, and D. S. Battisti, 1997: ENSO-like interdecadal variability: 1900-93. J. Clim., 10, 1004-1020.

The time series are available as:

A 3-column tables GR, CT*: year, calendar month, value

1-column tables: GR, CT*

Tables of the values organized by year and month: GR, CT*

GR * 100

       jan  feb  mar  apr  may  jun  jul  aug  sep  oct  nov  dec
 1900   36   88  138  207  182  197  199  232  193  190  190  224
 1901  236  278  259  238  146  143  154  178  176  195  242  240
 1902  206  134  127  168  225  239  193  114   61   12    8  -18
 1903  -11  -21   54  110  171  209  283  287  267  233  230  211
 1904  157  123   99  131  131   82   46  109  120  141   86   85
 1905   85   80  103   85   49   58   76   91   71   40   44   53
 1906   87  121  122   99  120  170  205  171  177  164  130   98
 1907   77   79   74    6  -22  -76  -58  -64   10   -3    4   40
 1908    6    6  -41  -48   16   27   51   69   73  102   95  106
 1909  144   80   48  -13  -21  -65  -53  -93  -22  -29   34   16
 1910  -48  -69  -24  -11  -26  -90  -59  -16  -23  -41  -53    8
 1911   23   24  -17  -44  -71 -119 -153 -189 -143 -122 -186 -202
 1912 -124  -34   -4  -11   44   59  105  100  120   97   77  103
 1913  115   96   35   29   32   28   63   94   73   57   27   30
 1914   44   61   52   50   33   30   13  -52  -91 -104  -62    0
 1915  -22  -11   -4   32   60  138   99  109   49  101  117   59
 1916    9    0  -35  -20  -68  -39  -25   -2   30   -9  -20  -54
 1917  -74  -62  -92  -96 -128  -40    8   -5  -75    6   77  102
 1918   62   34   65    3   -7  -62  -34  -20   16  -71 -188 -195
 1919 -156  -55  -46  -41  -38  -56    5   15   22   17  -30   -2
 1920   78   89   43  -77 -132 -129  -97  -53  -57  -31   10   21
 1921  -46  -80 -136  -75  -51  -41  -58  -62  -77  -50  -12   35
 1922   23  -28  -83 -136  -96  -54  -24  -52  -22   24   14  -14
 1923  -26  -33  -16  -45  -52  -69  -33  -12  -10  -51 -101 -131
 1924  -93  -93  -86  -53  -39  -59  -95  -60  -45  -38   -4   -6
 1925   34   16   41    1  -25  -55  -34  -10    3   33   31   48
 1926   60  118  160  166  166  149  127  126  130  168  174  145
 1927   82   32   26  -11  -28  -24  -24  -11  -24  -13  -22   28
 1928   50   77   65   37   50   28   26  -38  -42  -27    6   35
 1929   40   25   -6   -5    6   36   35   44   25   16   34   41
 1930   75   76   96   78   51   45   70   77   71   49   29   17
 1931   57   87  139  140  155  153  142  140  148  145  136  108
 1932   40    8   11   15   29   25   54   23    4    1  -10  -32
 1933  -83  -78  -93  -79  -91  -84 -106 -114  -74  -52  -21  -33
 1934  -15  -35  -44  -67  -65  -62  -46  -37  -16  -10   13   14
 1935   18  -35  -23   -4   10  -12  -68  -55  -70  -76  -63  -75
 1936  -40  -47  -21   19   59   80   62   40   33   40   47   13
 1937   17   13   -1  -56  -63  -40  -33  -27  -14    8   34   30
 1938   20   -9  -27  -24  -35  -52  -63  -20  -34   -4  -33  -11
 1939  -39  -22  -70  -48  -61  -50  -86 -107   -2   86  148  167
 1940  117   85  127  160  208  145  154  120  126  100  110  112
 1941  124  128  121  128  120   96  103  140  181  125   60   66
 1942   49   27   48   30   24  -18  -23   14   50   43   29   69
 1943  117  133   91  126   91   73  -14  -71  -72  -60  -46  -27
 1944  -13  -35  -41  -59  -79 -120 -128 -151 -108  -80  -40  -10
 1945    5   18   55   46  107    8   30    7   13   -8  -56 -100
 1946 -124  -42  -89 -133 -102  -40   28  -47  -42  -77  -83 -101
 1947  -87  -51  -62  -96 -131  -88  -65  -13  -20   -5  -18  -53
 1948  -62 -109 -121 -118  -90  -26   -9  -34  -84  -82 -123 -113
 1949 -162 -142 -206 -186 -157 -116  -74  -46  -27  -16  -49  -63
 1950  -92 -123 -134 -170 -160 -174 -166 -133  -94  -75 -127 -172
 1951 -184 -189 -216 -222 -159 -130 -155 -175 -148 -138 -196 -229
 1952 -180 -112  -83  -78 -100  -87 -108  -90  -66  -69  -70  -81
 1953 -121 -141 -152 -143 -122 -105  -88  -75  -97  -99 -109 -110
 1954 -115 -130 -125  -88  -23   10   27  -22  -40  -67  -51  -66
 1955 -164 -232 -285 -226 -199 -151 -143 -142 -158 -141 -155 -131
 1956 -122 -143 -211 -206 -234 -217 -181 -127 -140 -151 -132  -85
 1957  -84  -64  -54  -36  -36  -54  -49  -27   10   13    1  -16
 1958   20   32   87  126  162  146  107  102   81   95   91  122
 1959  110   76   26    7   27   47   46   13  -26  -23  -31    3
 1960   -8    1   -6    9   17    5  -24  -47  -54  -57  -21   14
 1961   -6  -45  -72  -60  -53  -60  -32   -5    7  -43  -97 -167
 1962 -190 -190 -126  -74  -71  -90  -80  -59  -83  -95  -71  -17
 1963    8  -14  -31  -60  -69  -92 -104  -51  -22  -10  -47  -48
 1964  -23  -22  -10  -21   -9  -48  -72  -94  -92  -62  -23  -17
 1965  -27  -32    4    8  -17  -50  -57  -42  -45  -44  -33  -32
 1966  -21  -23    4   16   32   22   20   31   27   44   41   42
 1967    7  -36  -50  -64  -79  -87  -63  -30  -20  -33  -49  -35
 1968   -7   29    5  -37  -76  -73  -83  -88  -78  -64  -63  -33
 1969   -3   16   17  -20  -12  -24  -40  -59  -60  -40  -50  -63
 1970  -42   16   29   30  -14    4  -26  -54 -116 -108 -117 -123
 1971 -173 -205 -215 -212 -205 -207 -157 -117  -98 -136 -145 -152
 1972 -105  -96  -94 -120 -115 -123 -108 -100  -78  -92 -120 -109
 1973  -80  -54  -29  -43  -44  -53  -60  -83 -130 -179 -204 -217
 1974 -231 -233 -227 -197 -190 -160 -168 -131 -126 -113 -106 -130
 1975 -131 -163 -178 -206 -183 -136 -122 -143 -177 -191 -186 -181
 1976 -149 -154 -163 -171 -158 -113 -103  -69  -58  -20   27   59
 1977   68   22   16   33   81   98  101   93   88   79   50   46
 1978   43   85  116  135  124   98   81   64   71   90   66   78
 1979   40   51   36   70   81   91   82  101   91   86   96  107
 1980  144  145  169  167  140  131  114  116  109   90   87  109
 1981  147  176  159  145  129  125  133  125  117  107   78   43
 1982   26   23   31   32   38   54   60   75   74   48   20   21
 1983   83  168  215  196  193  206  227  187  160  141  196  201
 1984  195  134  125  120  148  124   96   69   98  109  121  112
 1985  109  103   55   48   30   60   71   93   76   58   34   47
 1986   66   80   88   88   86   82   68   67  101  108  118   62
 1987   53   53   83   95   65   53   44   54   71   90   97   82
 1988   52   53   65  116  145  125   57  -16  -49  -54  -25  -48
 1989  -65  -59  -27  -31  -62  -30  -20  -10  -50  -31   37   64
 1990   56  -13   -1    7   31   12   10   20    6    8    4   12
 1991   33   39   35   19  -24  -15    4   59   71   76   37   11
 1992    7   56  121  192  230  238  207  168  166  187  194  194
 1993  200  203  185  187  191  190  180  155  135  106   96  120
 1994  124  132  132  147  148  110   53   35   27   -4  -30  -39
 1995   12   56   77  112  125  147  118  123  109  114  103   97
 1996  118  131  138  124   85   42  -14  -15    8   23   24   15
 1997   12   38   52  100  129  131  143  129  118   84   48   55
 1998   82  116  129  119  108  137  121   66   -4  -40  -29  -32
 1999  -33  -65 -127 -173 -205 -191 -157 -136 -124 -141 -120  -98
 2000  -63  -77  -98 -144 -135 -125 -118 -106  -91  -94  -81  -71
 2001  -53  -53  -76  -78 -111 -137 -145 -150 -146 -167 -150 -128
 2002 -119  -96  -98  -82 -133 -157 -179 -168 -153 -134  -77  -76
 2003  -29  -25   15    4   10  -33  -31  -55  -40  -47  -37  -26
 2004  -30  -27  -31  -18  -13  -43  -74  -83  -87  -88  -89  -97
 2005 -107  -94  -64    4   15   -2  -43  -95 -144 -189 -163 -115

CT * 100

       jan  feb  mar  apr  may  jun  jul  aug  sep  oct  nov  dec
 1900   65   44    9  -20  -25  -15  -28  -62  -61  -79  -62  -80
 1901  -79 -105 -113 -123 -112 -151 -154 -152 -108  -80  -80  -77
 1902  -67  -43  -26  -16    8   81  132  169  168  191  197  183
 1903  148  115   42  -11  -65  -98 -144 -162 -146 -145 -167 -169
 1904 -139  -84  -80  -79  -58   10   79   79   93   89  126  131
 1905  125  132  115  146  168  180  163  167  182  186  149  138
 1906  100   60   24    4  -23  -71 -131 -135 -146 -140 -125 -107
 1907  -81 -101  -89  -50    3   60   65   88   62   81   70   39
 1908   48   28   32  -11  -49  -67  -64  -81  -71  -96  -83  -93
 1909 -124  -95  -79  -58  -78  -78  -83  -83 -119 -127 -165 -155
 1910 -116  -99 -122 -139 -114  -62  -59  -68  -59  -63  -41  -72
 1911  -84 -104  -97  -44   -2   73  117  159  172  196  247  253
 1912  220  143  119   79   32  -13  -46  -15  -14  -10  -38  -61
 1913  -40  -22  -12  -28  -16    7   28   29   30   59   97  127
 1914  112   80   62   54   35   31   44  108  121  164  133  113
 1915   90   92   84   84   83   19   28  -28  -20 -122 -145 -111
 1916  -53  -41  -15  -39  -26  -94 -171 -209 -244 -214 -211 -177
 1917 -117  -90  -25  -40   -9  -50  -47  -35   -4  -96 -156 -149
 1918  -95  -52  -77  -23   21   92  127  143  142  200  254  267
 1919  237  141   93   40   40   33   10   26   37   44   57   76
 1920   11    6  -26   66   68   77   28    2   -6   -2  -25  -33
 1921  -17  -44  -46  -89  -64  -60  -45  -21  -21  -19  -28  -49
 1922  -40  -38    0   18  -17  -36  -67  -55  -89 -103  -95  -74
 1923  -67  -55  -27   20   39   64   76  101  117  134  124   94
 1924   61   39   11  -38  -73  -92  -95 -121 -122 -122 -110 -121
 1925 -112  -86  -48  -23    2   35   80   96  107  131  147  165
 1926  140  125  107   99   48   26  -12  -20  -66  -87 -101  -70
 1927  -35  -26  -52  -65  -50  -41  -41  -30    5   15   24   12
 1928    3  -14  -16  -10  -33  -37  -47  -28  -37  -40  -37  -58
 1929  -71  -59  -25    0    5    8   12   19   28   37   26   22
 1930   10   10   15   23   20   40   60  105  124  168  193  214
 1931  183  151  114   87   49   15   -1  -31  -64  -96 -101  -86
 1932  -55    1   29   69   67   62   24    1    9    7    2  -17
 1933   -3   -4    6  -33  -51  -87  -97  -97 -115 -119 -140 -116
 1934 -101  -65  -26    3   11    1   11   16   12    2  -24  -52
 1935  -81  -55  -33  -17  -17   -9   21   35   59   55   46   43
 1936   43   53   62   58   32   -3  -20   -7   16   19   11  -20
 1937  -32  -30   -1    6   15    8   11   -1  -13   -2  -10  -38
 1938  -57  -82  -87 -115 -126 -142 -138 -148  -98 -109  -82  -86
 1939  -40  -38    8   17   65   63   83   87   31  -22  -41   27
 1940   91  121   66   55   40   71   46   42   43   72  110  144
 1941  162  160  155  149  153  157  138   98   71   96  140  154
 1942  127   79   56   21    7  -31  -68 -131 -158 -176 -166 -188
 1943 -183 -174 -136 -112  -69  -35   13   16  -20  -60  -78  -69
 1944  -50  -30    8   27   34   38   42   51   17  -11  -36  -48
 1945  -55  -92 -125 -115 -102  -56  -61  -47  -25  -21   10   26
 1946   65   35   53   68   48    5  -50   -5    5   22   26   61
 1947   90   80   76   80   89   58   27  -14  -21  -20   -7   29
 1948   54   87   94   94   47  -14  -41  -47  -33  -23    6   -8
 1949   13    5   72   62   48    7  -25  -58 -103 -150 -136 -144
 1950 -146 -137 -110  -84  -90 -105  -86 -106 -100 -126  -96  -73
 1951  -46  -41   11   63   78  125  162  193  179  198  220  191
 1952  118   59   45   29   11  -27  -42  -32  -25  -19  -21   13
 1953   47   87  117  130  135  113   92  104   92  108   73   50
 1954   21   23  -18  -69 -132 -137 -133 -133 -135 -127 -120  -82
 1955  -35  -13  -17  -75  -98 -127 -109 -125 -146 -205 -218 -211
 1956 -149  -94  -40  -27  -13  -18  -26  -52  -64  -74  -76  -86
 1957  -56   -4   59  111  154  198  211  199  164  166  178  201
 1958  194  174  124   76   52   52   54   17    0   -8    7    3
 1959   -1   21   44   49   19  -15  -33  -40   -6   10   29    5
 1960   -6    1    7   11   -8  -23  -25  -10  -12  -33  -54  -47
 1961    3   24   33    1    6  -22  -40  -97 -122 -110  -80  -39
 1962  -24  -20  -54  -84  -83  -57  -40  -51  -51  -67  -85  -90
 1963  -82  -37  -10    9   16   47   84  106  107  110  120  117
 1964   81   30  -37 -102 -151 -141 -114  -83  -86  -86 -105  -89
 1965  -55    5   40   90  142  183  212  214  227  226  225  206
 1966  160  108   44   -8  -36  -29  -17  -25  -32  -54  -66  -90
 1967  -76  -59  -47  -31   -3    0  -51 -113 -139 -119  -99 -103
 1968 -121 -135 -119 -101  -61  -22   36   57   65   68   88   99
 1969   85   68   60   93  109   99   85   80  114  127  152  136
 1970   97   33    3  -24  -51 -113 -139 -143 -113 -119 -117 -147
 1971 -140 -132  -91  -68  -57  -55  -66  -72  -84  -82  -98  -76
 1972  -52   -3   37   86  136  189  242  265  281  288  319  302
 1973  222  123   17  -39  -87 -121 -144 -155 -139 -128 -136 -152
 1974 -142 -108  -57  -26    4   12   20    8  -19  -49  -79  -67
 1975  -63  -37  -21  -19  -47  -83  -94  -99 -107 -119 -143 -160
 1976 -138  -79  -24   15   73  124  175  175  185  171  149  134
 1977  104   95   35    1  -25   -5    0    2   15   35   63   67
 1978   64   31  -17  -61  -87  -90  -97  -86  -60  -27    1  -17
 1979  -21  -32  -10    4   15    3   -1    8   35   54   42   28
 1980   -2  -10  -17   -3   11    2  -17  -35  -39  -19   -7  -39
 1981  -88 -119 -104  -80  -70  -70  -86  -83  -70  -60  -50  -31
 1982  -22  -26  -25   15   61   87  110  144  200  271  324  343
 1983  301  238  192  205  212  200  149  103   41  -25  -89 -101
 1984  -96  -59  -58  -70 -130 -128 -106  -61  -82  -93 -124 -131
 1985 -149 -147 -133 -134 -116 -109  -82  -89  -83  -90  -81  -90
 1986  -75  -57  -39  -45  -52  -29    1   31   31   69   97  149
 1987  158  171  167  168  174  184  196  214  213  196  167  118
 1988   68   18  -24  -94 -174 -219 -203 -154 -139 -146 -171 -162
 1989 -137 -125 -119 -110  -75  -72  -68  -72  -51  -50  -55  -58
 1990  -42  -24  -24  -18  -24  -15  -14  -10   -2  -17  -31  -34
 1991  -36  -27  -36  -13   26   62   69   48   65   95  143  167
 1992  176  163  144  130   98   62   15   -4  -29  -35  -37  -30
 1993  -21    1   40   75   96   87   70   59   64   68   53   21
 1994  -19  -43  -58  -49  -30  -17    1   15   57   96  117  109
 1995   81   39   -7  -54  -63  -63  -67  -91 -113 -129 -136 -133
 1996 -132 -119 -119 -101  -93  -68  -54  -50  -53  -56  -68  -75
 1997  -74  -45   -3   59  126  195  255  306  338  370  387  383
 1998  333  272  200  144   67   -8  -69  -88 -103 -132 -181 -212
 1999 -212 -175 -139 -110 -101  -87  -96  -97 -109 -127 -163 -193
 2000 -192 -155  -98  -60  -50  -53  -50  -44  -50  -60  -80  -88
 2001  -89  -67  -44  -28  -16   -4    8    7   -1   -9  -27  -26
 2002  -13   12   24   33   63   90  118  135  155  188  196  188
 2003  142  103   47  -11  -52  -45  -20    0   18   40   55   50
 2004   34   11   -9   -9    0   20   43   71   90  105  108  116
 2005  103   92   59   45   32   33   29   25   21   -4  -40  -75

June 2006

Todd Mitchell (mitchell@atmos.washington.edu)

JISAO data