big GIF | PDF | PNG | PS
Associated correlations map: big GIF | PDF | PNG | PS
gif
The leading empirical orthogonal functions (EOFs) of Northern Hemisphere (20-90N) sea-level pressure monthly anomaly covariance for all calendar months, 1948 - June 2008, are presented on this page. The data is the National Centers for Environmental Prediction / National Center for Atmospheric Research reanalysis (Kistler et al. 2001). The NAM is EOF one (EOF1) and it explains 18.0% of the variance. The PNA is EOF2 and it explains 10.3% of the variance. This PNA definition is not the same as the grid-point definition of Wallace and Gutzler (1981). EOF3 explains 9.5% of the variance.
In the following, regression maps are the typical SLP anomaly at each grid point for a one-standard deviation fluctuation in the mode. Correlation maps indicate the correlation of the SLP anomaly at a grid point with the index.
big GIF |
PDF |
PNG |
PS
Associated correlations map: big GIF |
PDF |
PNG |
PS
It is also helpful to view the plots in a polar stereographic
projection.
GIF |
PDF |
PS
The 3 EOFs are superimposed, with EOF 1 contoured in black,
2 in red, and 3 in blue. The contour interval is odd-numbered millibars.
GIF |
PDF |
PS
The same analysis with each of the modes also plotted separately. Contour
interval is mb, with the zero contour omitted.
Reference:
Kistler, R., E. Kalnay, W. Collins, S. Saha, G. White, J. Woollen,
M. Chelliah, W. Ebisuzaki,
M. Kanamitsu, V. Kousky, H. van den Dool, R. Jenne, M. Fiorino, 2001:
The NCEP-NCAR
50-Year Reanalysis: Monthly Means CD-ROM and
Documentation. Bull. Amer. Meteor.
Soc., 82, 247-268.
The time series have been standardized such that the mean and standard
deviation are 0 and 1, respectively, for all months combined.
I) Daily values for 1948 through May 2005 (June through December
2005 filled with missing values)
II) Monthly values, standardized with respect to
1948 - June 2008
Data:
The time series are provided in both monthly and daily time
resolutions. The daily values are the projection of the above
correlation maps, derived from monthly data, onto daily anomaly SLP
fields. The assumption is that the patterns from the daily and
monthly SLP anomalies are very similar.
7-column ascii table: year, month, day of
month, julian day, PC1(NAM), PC2(PNA), and PC3. Standardized with
respect to 1948 - June 2008.
same table with the
leap days (29 February) removed, Julian Days are 1 - 365.
5-column ascii table: year, month, PC1, PC2, and PC3.
jan feb mar apr may jun jul aug sep oct nov dec
1948 6 91 269 110 -31 -50 -28 -5 30 86 78 60
1949 190 201 -41 140 -50 -78 -4 0 -42 70 -133 -78
1950 -1 76 38 28 25 53 -62 -61 33 -37 -80 -191
1951 -1 -45 -213 -90 -63 -86 18 -30 -82 -8 23 204
1952 48 -174 -200 51 -78 -44 48 4 -37 -51 -192 -170
1953 -70 7 146 -131 -48 0 34 19 72 -7 63 104
1954 5 24 50 32 -169 -21 31 1 20 44 1 12
1955 -79 -179 -181 2 19 -25 61 99 29 11 -122 -63
1956 -126 -202 70 -98 152 31 -13 -51 -5 102 -8 -12
1957 233 -194 -188 33 -76 -63 -58 15 -88 92 -108 92
1958 -111 -178 -259 -32 -33 -112 -50 -66 15 63 36 -168
1959 -196 316 186 -3 -24 0 21 -61 0 -22 -132 -17
1960 -235 -181 -160 -41 -88 10 -51 -85 -35 -111 -56 -29
1961 -106 116 53 -44 25 79 -1 15 94 -7 12 -181
1962 187 12 -286 104 -7 25 -88 26 -11 3 -91 -43
1963 -288 -106 72 -57 81 -58 -20 -56 37 107 -31 -58
1964 113 -50 -40 27 86 24 89 -105 -29 23 -32 -35
1965 -83 -186 -80 36 -17 10 -44 -5 -71 57 -136 -14
1966 -298 -143 -96 -233 114 53 12 -78 28 -131 22 -174
1967 -7 167 196 152 0 66 26 -11 41 126 37 -32
1968 -45 -164 231 27 -20 37 -53 -52 -118 -107 -180 -86
1969 -324 -306 -141 62 -57 -18 43 -68 2 9 44 -146
1970 -222 -95 -215 10 47 102 20 -11 -4 -10 47 -17
1971 -4 -96 -95 -60 86 -62 -39 98 23 116 64 80
1972 38 20 3 74 19 -16 -46 17 -96 38 -41 151
1973 197 119 94 -138 12 59 42 35 27 33 12 20
1974 27 -49 -25 54 -56 -13 42 -36 -25 -107 -32 49
1975 183 86 43 19 -49 -37 54 34 120 23 93 168
1976 43 217 67 49 8 27 -4 92 -48 -94 23 -202
1977 -358 -161 39 117 27 -21 -43 -117 64 -6 61 -1
1978 36 -241 73 -88 3 52 -46 -14 -9 90 293 -90
1979 -193 -46 -74 -152 -20 77 10 -51 0 -113 54 154
1980 -183 -16 -137 -38 -104 59 -50 -26 28 -61 -94 -1
1981 69 15 -135 62 33 -49 59 -10 -114 -165 2 -105
1982 -63 131 111 137 -32 -112 17 34 54 -50 82 133
1983 193 -85 -9 -95 -51 30 30 126 -5 115 4 43
1984 94 12 -201 -34 49 -2 3 69 -41 -48 -69 59
1985 -228 -162 63 43 -39 -45 -32 -5 -10 98 -109 -183
1986 -16 -204 247 -5 35 66 -1 -64 2 131 98 50
1987 -35 -103 -152 46 39 -71 -29 -82 15 -13 -38 -27
1988 75 -83 -19 -45 -79 20 -13 30 97 15 43 204
1989 357 357 162 -40 84 27 94 67 83 87 15 -31
1990 115 324 355 182 132 24 -19 0 -25 55 45 143
1991 107 -16 -48 53 63 -28 -6 98 -7 -29 52 204
1992 166 174 127 -77 138 -20 26 53 -81 -33 80 183
1993 396 120 129 -34 -145 -58 -52 -33 -41 -43 126 -17
1994 -24 -54 186 8 6 144 51 92 -9 15 190 107
1995 41 169 41 -102 -85 -1 -7 72 -29 8 -34 -140
1996 -71 71 -121 -149 -31 36 72 26 -117 -2 12 -150
1997 35 247 125 53 -95 -75 -21 32 31 -80 -32 27
1998 -170 74 9 -5 55 -89 -29 61 -92 5 -136 152
1999 25 90 -161 15 17 81 -1 -40 5 -20 92 97
2000 123 174 4 -28 100 60 -59 17 54 11 -161 -232
2001 -41 -29 -161 83 51 -12 7 60 -62 49 138 -100
2002 193 150 121 45 43 61 40 -7 20 -157 -97 -108
2003 32 72 143 -2 95 -10 7 -20 59 -67 43 92
2004 -149 -78 49 -32 -16 -39 -6 -50 78 -51 110 110
2005 65 -91 -93 0 -66 -23 11 16 74 18 29 -178
2006 12 8 -152 -20 10 102 29 -24 74 -114 31 277
2007 232 -86 123 83 87 -54 -20 16 23 44 -11 106
2008 96 163 62 -65 -110 -20
PNA (PC2) * 100
jan feb mar apr may jun jul aug sep oct nov dec
1948 -117 -205 -110 -213 -45 -37 -12 -78 -45 92 28 -205
1949 -100 -62 150 87 -42 -76 -39 -22 23 -14 97 -122
1950 -378 -105 151 -25 1 -29 -25 29 37 54 -228 11
1951 -89 -133 -166 104 57 -1 -15 -33 8 -13 2 -181
1952 -79 48 -147 57 -41 24 -13 -44 3 -27 78 176
1953 148 54 -14 139 41 -91 -30 -26 -56 67 217 84
1954 -154 6 -176 -84 4 63 -34 -65 -67 83 133 -42
1955 39 -305 -143 -41 9 -48 13 -29 -78 27 -106 -239
1956 -137 -158 -56 -1 88 18 -80 25 -56 -81 39 6
1957 -223 -163 43 5 53 48 -55 -21 66 49 38 -98
1958 204 130 -174 73 48 -17 2 -29 -42 -44 4 -25
1959 -103 -76 -30 -76 -20 -11 -44 -68 20 18 22 -80
1960 -7 -50 -161 10 -18 -60 -38 -78 -101 -19 -94 60
1961 202 21 117 -176 -15 -46 -69 -2 -113 -135 -72 -144
1962 -142 17 -129 -107 -133 -79 -83 -20 -67 70 116 -15
1963 46 75 -253 -123 -56 -55 -75 -55 101 32 -76 122
1964 112 -19 -147 -148 -212 22 36 -29 -44 -30 -65 -118
1965 -3 -40 -11 -39 -76 24 -38 -11 -74 36 -145 -181
1966 -13 -290 -6 -133 -37 32 2 -27 121 -97 -140 37
1967 -37 -14 -123 -148 -130 44 -75 65 151 80 -6 -46
1968 -183 202 43 -39 -51 -22 54 26 -89 18 91 -240
1969 -329 -1 -76 120 46 69 -25 -18 83 75 65 244
1970 -124 162 133 -27 -41 49 47 -4 -19 -57 -161 -94
1971 -268 -11 19 23 32 9 20 53 -20 -55 14 -184
1972 -248 -155 1 -127 -9 0 -33 79 -22 -48 55 -118
1973 -33 23 101 -35 60 27 4 -23 10 -34 -137 120
1974 -110 -103 117 49 -18 -33 9 14 -34 74 2 133
1975 -123 -4 -75 -90 37 -26 71 -26 -52 -43 -20 125
1976 105 -136 -40 60 18 -23 96 84 100 -50 140 58
1977 173 178 -107 -1 14 26 -2 57 -53 51 0 -114
1978 192 152 90 -5 -44 -63 19 55 37 90 29 -246
1979 -25 -273 86 -38 77 -61 43 53 111 91 -14 -30
1980 -66 234 33 229 44 -91 12 -63 14 82 80 68
1981 393 84 114 38 63 36 -28 61 -25 -50 139 -64
1982 -118 -212 -69 -27 -31 57 50 -32 7 -133 67 125
1983 275 369 317 -35 -23 121 55 14 -101 15 211 -27
1984 14 78 194 11 -5 38 -34 34 38 2 30 -89
1985 143 -296 -96 -67 -18 -20 -2 -75 -45 -59 -139 117
1986 191 159 155 -94 1 70 4 32 -7 94 -15 230
1987 155 39 72 126 19 76 47 -40 -26 -15 70 -63
1988 5 130 12 72 51 64 -10 26 -28 27 80 42
1989 -75 -228 -68 -57 -29 -3 10 28 50 -51 -64 7
1990 5 -261 141 32 72 -11 16 55 52 -60 -265 -103
1991 -23 157 -97 84 99 -36 0 71 100 -47 82 125
1992 345 32 132 -17 -3 75 15 21 -35 58 30 -138
1993 -20 226 162 197 66 15 -6 10 -67 33 -90 101
1994 -77 -174 70 49 64 -6 -4 -49 32 24 -186 130
1995 176 16 -10 69 54 49 8 9 148 3 -49 214
1996 -135 35 -41 166 -54 -25 15 -32 -55 -59 -35 -105
1997 148 129 -24 163 29 6 49 -1 127 -2 -7 -8
1998 167 320 151 -7 45 -83 7 -20 -43 -27 54 -91
1999 -57 133 -12 -66 -29 78 -55 61 -30 -47 48 -35
2000 -96 277 254 -14 -28 14 0 -48 6 -17 26 37
2001 154 -59 -82 1 -6 -62 -11 30 29 -49 211 101
2002 -5 -25 -121 -147 -10 64 30 13 6 41 148 145
2003 227 -16 66 -3 0 20 -29 23 58 57 -252 183
2004 -38 201 -51 90 -19 -21 73 34 -19 1 43 14
2005 100 75 118 44 119 6 46 39 -28 -5 -89 286
2006 20 -199 -153 15 -52 -4 48 -58 -25 -116 -160 192
2007 43 -126 -34 234 -25 -57 63 27 28 39 129 -50
2008 -49 137 -41 -137 8 -49
PC3 * 100
jan feb mar apr may jun jul aug sep oct nov dec
1948 -58 -6 -59 -7 51 -67 -74 -27 -10 -15 -6 -87
1949 -127 -87 169 -38 -81 20 -25 -26 5 -31 209 151
1950 80 -61 -30 7 -74 -39 -120 -28 -38 101 92 13
1951 109 238 -139 -33 -90 -50 -21 62 -2 46 -67 -110
1952 -26 89 -43 41 -42 -42 5 -84 -79 24 192 81
1953 -13 101 -103 55 -51 71 -26 34 -78 43 205 104
1954 31 247 48 105 45 -15 8 -118 -65 -22 216 344
1955 -178 -92 16 116 -75 -42 -12 32 78 -55 -192 -144
1956 19 329 153 -56 -11 2 -97 -131 -139 -13 136 270
1957 31 87 -68 37 -77 -75 -14 30 -32 -14 -71 -155
1958 59 -247 -119 49 -28 -24 -137 -77 -55 30 41 -78
1959 -148 64 36 -32 -17 -29 17 -113 -155 20 211 297
1960 15 -250 63 84 97 -66 -18 -123 28 -106 81 141
1961 78 -24 -207 -203 -70 6 -75 -53 -89 151 -20 -114
1962 -7 -71 -242 57 -50 -42 -59 -69 1 -32 207 -136
1963 -37 -103 -28 26 61 -67 -54 -47 -11 34 -177 -127
1964 -72 238 100 83 51 -50 32 -126 -66 100 -170 84
1965 31 -70 -39 102 -71 -49 -117 -76 -62 -52 -57 50
1966 -71 -136 -57 43 42 20 -40 -117 -158 -45 74 369
1967 -38 65 -58 17 44 63 35 96 36 -28 181 -140
1968 -33 -70 -278 -46 -14 -1 -80 4 79 -62 -27 -22
1969 109 213 -71 1 -60 -28 73 86 69 -34 -102 157
1970 -85 -38 86 -28 55 87 0 4 65 -13 -115 -57
1971 -180 227 35 -51 24 -118 -2 11 85 -63 -186 -15
1972 281 26 48 -43 39 107 49 74 69 30 -76 54
1973 49 -149 26 -86 28 42 11 44 -15 -64 -316 -153
1974 271 134 205 -87 -9 29 -13 -23 11 80 54 148
1975 -70 -83 -156 -10 -15 -6 31 -12 4 -45 -2 -129
1976 -102 133 356 -13 66 42 -39 65 -50 92 65 116
1977 146 42 -12 36 17 -23 -4 -34 -7 40 -67 -65
1978 -57 -129 23 -138 95 18 -39 39 -87 -45 -83 -129
1979 -21 -185 28 13 15 60 53 18 -24 23 57 -29
1980 12 103 201 88 -28 7 -22 26 65 -1 -236 -87
1981 -19 128 -226 -118 43 37 63 112 33 55 49 -151
1982 -126 -5 147 -22 24 -89 67 26 41 59 -20 -99
1983 -116 -134 -38 -37 7 136 24 -2 -19 -44 -333 -121
1984 186 314 92 51 86 15 29 37 25 38 26 314
1985 -98 124 188 -99 15 -35 22 2 46 -27 -80 -78
1986 50 -35 166 25 19 61 -8 3 -79 90 55 17
1987 -14 -179 103 47 30 18 -6 -45 27 234 98 -220
1988 -8 226 64 -138 56 26 23 53 16 -21 -185 -105
1989 -14 -82 38 96 61 123 126 -9 79 -48 33 -244
1990 164 29 -103 125 -111 28 29 24 60 -45 -135 41
1991 5 116 138 87 42 30 -23 73 -50 7 -29 43
1992 -159 -112 67 -4 118 30 28 38 196 -87 50 -32
1993 -68 -118 4 34 -56 -35 -20 45 20 -47 417 24
1994 -98 20 112 56 -29 44 43 28 73 -18 -53 99
1995 -26 -150 0 -37 18 9 -57 -31 25 -108 -182 -152
1996 163 97 185 49 22 68 79 115 25 -22 63 -116
1997 -162 -75 -39 -159 -48 -48 30 63 51 -130 7 -19
1998 -14 -216 36 -49 20 2 3 54 -73 -49 140 -21
1999 90 -54 116 -85 27 97 5 -54 59 -16 43 -62
2000 97 -20 -147 -79 -29 -6 29 7 53 215 136 -89
2001 89 -26 -195 8 -90 -54 16 41 68 3 -91 113
2002 -137 -215 -225 134 -9 14 105 12 -25 -18 1 141
2003 -189 31 -14 39 68 -23 88 57 48 -33 180 -172
2004 -92 -185 81 14 -23 -40 107 -3 25 -44 -176 120
2005 73 176 -183 -44 -13 -78 27 41 -3 -10 22 175
2006 373 -21 -208 155 -7 96 46 4 -83 -113 15 -24
2007 -148 -138 127 -68 -81 -106 -98 -32 -10 107 -102 19
2008 200 -31 -173 -69 -26 -60
July 2008
Todd Mitchell ( 206-685-3786, mitchell@atmos.washington.edu
)
JISAO data publications
