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 - March 2010, 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 18.5% 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 9.3% 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 - March 2010
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 7 99 265 109 -32 -48 -25 -5 28 84 76 64
1949 190 206 -39 134 -51 -74 -2 -1 -43 70 -132 -69
1950 5 82 35 26 22 53 -60 -61 30 -37 -77 -183
1951 3 -33 -207 -91 -65 -84 20 -29 -83 -8 21 206
1952 51 -162 -196 48 -78 -41 51 4 -37 -51 -189 -164
1953 -69 16 145 -131 -51 3 36 18 69 -7 60 107
1954 9 33 51 32 -168 -20 33 0 18 41 -1 19
1955 -79 -165 -176 1 15 -23 61 97 28 11 -122 -59
1956 -121 -187 70 -99 147 33 -11 -51 -6 102 -8 -5
1957 234 -182 -187 31 -78 -62 -54 15 -90 89 -108 95
1958 -110 -174 -255 -34 -34 -109 -49 -66 12 62 35 -162
1959 -192 319 183 -5 -26 1 23 -60 -3 -23 -129 -11
1960 -229 -173 -157 -42 -89 12 -48 -84 -35 -110 -55 -22
1961 -104 121 49 -47 22 79 1 13 91 -5 11 -174
1962 188 21 -283 101 -8 27 -84 25 -12 1 -89 -40
1963 -280 -100 72 -59 79 -56 -18 -56 34 103 -34 -56
1964 110 -41 -39 28 84 24 89 -104 -30 24 -33 -28
1965 -80 -174 -78 35 -19 11 -41 -6 -71 54 -133 -8
1966 -294 -134 -93 -230 111 53 15 -78 24 -129 24 -165
1967 -4 171 195 150 0 67 29 -11 37 123 37 -27
1968 -40 -158 225 26 -22 38 -50 -51 -116 -107 -182 -81
1969 -315 -293 -140 59 -59 -17 45 -66 1 7 41 -140
1970 -220 -86 -211 9 45 103 21 -11 -5 -9 46 -12
1971 -3 -85 -92 -61 82 -59 -36 96 22 114 62 85
1972 42 28 3 72 17 -13 -43 17 -94 39 -42 153
1973 194 125 94 -137 9 60 44 35 25 33 11 23
1974 29 -39 -25 51 -58 -11 43 -36 -25 -103 -33 53
1975 182 90 42 19 -50 -34 55 33 118 22 90 169
1976 44 222 69 46 6 29 -3 90 -50 -92 20 -194
1977 -352 -154 40 115 25 -19 -39 -116 62 -6 58 2
1978 36 -235 71 -89 3 55 -43 -14 -11 89 287 -84
1979 -188 -40 -72 -149 -22 81 13 -51 -2 -112 52 155
1980 -179 -12 -132 -40 -105 62 -46 -25 27 -61 -97 3
1981 67 24 -138 60 30 -46 61 -10 -113 -159 0 -100
1982 -61 137 111 133 -31 -110 20 34 53 -47 79 134
1983 188 -82 -13 -94 -52 32 32 124 -6 114 -3 46
1984 97 21 -198 -36 47 1 6 68 -42 -46 -70 66
1985 -226 -148 65 40 -40 -42 -29 -4 -10 98 -107 -178
1986 -15 -196 242 -4 32 66 2 -63 2 128 98 51
1987 -36 -97 -150 42 37 -68 -27 -80 13 -10 -38 -25
1988 75 -72 -18 -49 -80 21 -10 28 95 15 39 205
1989 354 362 160 -40 82 29 97 66 80 87 14 -31
1990 115 326 349 178 126 26 -16 0 -26 54 45 148
1991 107 -9 -46 51 61 -25 -4 96 -9 -27 50 204
1992 159 177 125 -77 135 -18 28 52 -78 -33 77 186
1993 390 124 125 -37 -146 -56 -48 -31 -40 -42 127 -12
1994 -21 -44 183 7 3 144 53 91 -9 15 186 108
1995 39 172 41 -103 -87 0 -5 70 -30 7 -35 -137
1996 -67 78 -117 -150 -32 38 74 27 -116 -2 13 -144
1997 32 249 123 47 -96 -73 -18 31 29 -80 -35 28
1998 -169 73 9 -7 52 -84 -26 61 -92 6 -134 155
1999 28 95 -157 14 16 82 2 -41 4 -18 89 101
2000 126 177 3 -29 96 61 -55 18 51 13 -159 -226
2001 -41 -20 -160 81 48 -9 10 59 -62 49 133 -94
2002 190 154 120 45 41 61 43 -6 18 -154 -99 -105
2003 29 78 139 -4 92 -9 9 -20 57 -65 44 92
2004 -147 -72 51 -33 -17 -36 -4 -50 77 -50 106 114
2005 65 -79 -96 -2 -68 -22 13 15 73 17 30 -172
2006 15 17 -150 -20 8 103 31 -23 70 -112 31 274
2007 229 -79 123 77 84 -51 -18 16 22 44 -13 109
2008 99 167 61 -65 -111 -17 -30 11 -17 142 33 77
2009 100 -49 3 95 117 -116 -121 1 95 -151 33 -323
2010 -185 -389 -12
PNA (PC2) * 100
jan feb mar apr may jun jul aug sep oct nov dec
1948 -114 -198 -101 -210 -47 -37 -10 -78 -46 94 33 -193
1949 -97 -52 140 93 -41 -79 -39 -22 20 -10 86 -132
1950 -384 -96 155 -26 6 -26 -21 28 36 49 -233 8
1951 -96 -142 -165 102 61 0 -15 -39 7 -15 6 -169
1952 -83 42 -146 58 -40 22 -14 -43 2 -28 63 174
1953 144 52 -6 136 44 -96 -29 -29 -51 65 209 88
1954 -158 2 -174 -89 -2 62 -36 -62 -68 85 126 -55
1955 49 -305 -148 -44 13 -47 14 -27 -85 30 -98 -229
1956 -142 -173 -57 -1 88 16 -77 27 -52 -80 30 -1
1957 -224 -165 48 3 55 51 -56 -25 64 49 38 -88
1958 200 145 -170 69 46 -19 7 -26 -37 -44 4 -22
1959 -102 -67 -21 -73 -20 -10 -46 -67 25 17 9 -87
1960 -13 -37 -161 8 -21 -58 -40 -77 -106 -13 -96 53
1961 196 31 127 -163 -13 -48 -69 -3 -108 -142 -71 -135
1962 -141 18 -122 -105 -133 -78 -84 -18 -68 71 105 -6
1963 39 87 -247 -120 -60 -54 -73 -57 99 35 -66 133
1964 120 -21 -147 -152 -211 25 35 -27 -45 -35 -59 -121
1965 -6 -41 -9 -43 -73 25 -36 -9 -76 42 -148 -180
1966 -13 -278 -9 -137 -36 33 0 -25 127 -97 -148 18
1967 -35 -8 -121 -146 -132 40 -77 58 151 85 -17 -40
1968 -189 210 59 -34 -49 -20 55 24 -95 22 93 -235
1969 -342 -13 -72 122 48 70 -27 -23 77 77 67 237
1970 -118 158 121 -26 -44 47 46 -5 -24 -59 -156 -89
1971 -256 -22 15 25 34 11 18 54 -24 -49 19 -181
1972 -258 -147 1 -122 -12 -8 -37 75 -30 -51 54 -111
1973 -27 28 102 -38 60 26 4 -26 11 -30 -127 127
1974 -120 -105 113 55 -18 -34 8 12 -39 63 -2 129
1975 -118 10 -67 -91 38 -28 70 -25 -53 -38 -18 134
1976 104 -131 -53 62 15 -25 99 83 100 -54 139 52
1977 158 180 -103 -1 16 25 -4 54 -52 51 2 -104
1978 190 165 91 1 -48 -67 19 51 37 92 37 -233
1979 -32 -258 78 -43 76 -64 40 48 110 89 -16 -20
1980 -70 237 21 224 44 -92 12 -64 10 81 89 71
1981 391 80 127 43 65 34 -31 54 -28 -61 136 -54
1982 -114 -201 -76 -22 -34 59 47 -36 5 -135 66 132
1983 281 379 318 -37 -25 116 54 15 -101 15 229 -19
1984 1 69 186 11 -8 34 -36 33 33 -2 30 -99
1985 144 -300 -100 -60 -19 -21 -4 -77 -49 -55 -139 119
1986 184 167 156 -95 2 69 4 29 -7 92 -18 232
1987 158 52 64 126 17 72 46 -41 -27 -25 64 -46
1988 6 118 8 82 48 61 -12 25 -28 29 92 52
1989 -69 -219 -66 -62 -31 -8 6 29 45 -48 -64 26
1990 -2 -250 150 29 82 -13 14 51 44 -56 -257 -102
1991 -22 158 -101 83 95 -39 2 70 98 -49 83 131
1992 357 44 130 -18 -3 73 15 19 -48 61 28 -129
1993 -10 233 165 197 68 15 -7 4 -71 34 -104 100
1994 -80 -169 68 45 67 -6 -4 -49 28 28 -176 132
1995 178 29 -10 69 54 48 12 13 143 9 -41 227
1996 -140 36 -50 164 -55 -29 12 -35 -59 -57 -42 -98
1997 158 138 -20 175 28 8 49 -3 125 4 -2 3
1998 164 338 147 -4 45 -86 4 -23 -41 -28 44 -84
1999 -65 137 -23 -61 -29 75 -55 63 -32 -47 45 -29
2000 -104 280 256 -11 -23 15 -4 -51 6 -26 16 39
2001 151 -58 -73 2 1 -61 -12 30 24 -47 214 101
2002 6 -12 -112 -150 -8 65 26 12 8 38 150 146
2003 235 -10 75 -2 0 22 -31 18 56 55 -258 196
2004 -37 209 -55 87 -21 -22 68 34 -20 3 50 9
2005 92 64 130 47 117 9 45 36 -29 1 -92 277
2006 5 -195 -145 6 -49 -7 47 -60 -18 -112 -162 205
2007 50 -115 -39 242 -21 -53 67 27 25 37 128 -46
2008 -58 145 -35 -134 10 -48 30 77 10 -32 63 -199
2009 -92 -257 -154 -42 -21 55 8 -2 90 24 -36 -15
2010 169 4 107
PC3 * 100
jan feb mar apr may jun jul aug sep oct nov dec
1948 -66 -16 -67 -20 48 -68 -73 -30 -16 -12 -6 -99
1949 -142 -96 179 -36 -85 17 -25 -27 7 -32 217 141
1950 59 -67 -21 3 -75 -40 -119 -25 -39 107 80 13
1951 101 232 -146 -29 -86 -48 -22 62 -1 48 -66 -125
1952 -37 91 -45 45 -44 -42 4 -87 -83 27 196 90
1953 -11 104 -106 65 -49 68 -26 34 -82 49 214 109
1954 20 252 43 101 46 -13 6 -121 -72 -18 226 339
1955 -177 -109 11 116 -77 -44 -9 31 72 -53 -197 -156
1956 9 327 156 -55 -12 2 -99 -131 -143 -19 134 269
1957 12 79 -60 39 -74 -72 -14 28 -29 -13 -69 -165
1958 67 -237 -121 53 -28 -22 -135 -76 -56 28 42 -78
1959 -156 59 39 -34 -18 -29 17 -117 -156 23 215 296
1960 14 -250 64 87 98 -69 -17 -126 23 -102 80 143
1961 88 -23 -205 -210 -72 2 -78 -54 -96 147 -23 -120
1962 -21 -73 -244 53 -59 -46 -61 -72 -3 -28 214 -137
1963 -35 -92 -37 25 56 -68 -55 -49 -6 37 -181 -117
1964 -70 242 101 74 40 -48 35 -127 -71 100 -177 75
1965 30 -74 -36 101 -75 -48 -119 -76 -68 -46 -63 39
1966 -67 -145 -58 41 40 24 -39 -117 -154 -46 64 371
1967 -41 66 -69 8 38 63 33 101 45 -26 179 -147
1968 -48 -55 -278 -48 -15 -2 -75 7 76 -57 -17 -31
1969 93 218 -69 8 -57 -23 72 87 71 -30 -105 171
1970 -87 -32 93 -31 51 91 3 5 63 -18 -125 -64
1971 -195 226 39 -48 26 -118 1 13 83 -67 -191 -29
1972 270 22 50 -49 38 106 50 79 67 28 -79 48
1973 48 -153 30 -90 30 43 13 42 -15 -66 -329 -151
1974 264 131 219 -83 -10 28 -13 -22 7 84 54 149
1975 -84 -81 -158 -17 -14 -8 36 -13 -3 -44 -4 -131
1976 -105 128 358 -10 67 40 -32 70 -46 95 73 121
1977 156 56 -17 34 18 -23 -2 -30 -12 44 -72 -70
1978 -51 -112 29 -135 92 12 -37 42 -88 -44 -87 -137
1979 -23 -195 31 11 18 54 55 21 -22 33 55 -32
1980 9 120 207 100 -25 1 -20 23 64 5 -231 -89
1981 -4 132 -215 -117 47 40 63 115 32 51 54 -151
1982 -135 -14 143 -25 20 -86 71 22 39 55 -22 -99
1983 -113 -113 -23 -40 5 142 28 -3 -27 -48 -323 -125
1984 179 320 108 53 85 15 28 38 25 38 31 310
1985 -89 113 187 -104 14 -36 23 -4 40 -31 -86 -73
1986 56 -17 176 21 18 66 -8 6 -83 93 50 26
1987 -5 -174 112 53 29 23 -2 -47 24 237 101 -224
1988 -9 234 66 -131 58 29 25 55 12 -17 -182 -108
1989 -27 -100 35 96 56 124 128 -8 80 -52 31 -243
1990 159 11 -101 126 -109 27 32 25 59 -47 -149 31
1991 -2 129 138 92 43 28 -21 76 -49 6 -28 46
1992 -147 -113 72 -4 117 34 31 38 194 -83 49 -43
1993 -79 -110 13 45 -51 -35 -20 44 16 -44 417 24
1994 -110 15 112 58 -25 40 46 26 74 -14 -63 102
1995 -20 -153 -2 -33 21 12 -55 -31 32 -108 -184 -137
1996 160 101 191 60 19 65 80 116 23 -25 57 -120
1997 -157 -74 -42 -151 -48 -45 36 65 55 -129 12 -16
1998 -7 -201 45 -48 20 -2 3 51 -73 -53 143 -29
1999 82 -52 117 -89 24 101 3 -50 58 -18 43 -70
2000 82 -12 -138 -79 -33 -5 31 2 55 216 138 -86
2001 96 -30 -195 8 -92 -57 18 42 70 1 -85 120
2002 -142 -222 -233 130 -11 17 109 13 -24 -14 13 154
2003 -180 33 -8 43 65 -20 90 58 49 -29 168 -166
2004 -95 -176 79 19 -27 -43 113 1 21 -43 -178 114
2005 70 179 -172 -41 -9 -77 31 42 -8 -6 14 190
2006 373 -29 -212 155 -11 96 51 2 -84 -117 3 -19
2007 -157 -139 125 -56 -85 -108 -93 -31 -12 111 -99 13
2008 193 -27 -178 -75 -24 -63 -16 -55 70 18 -100 112
2009 76 -9 -24 -34 53 -4 -77 49 15 -80 154 -28
2010 128 -48 -90
May 2010
Todd Mitchell ( 206-685-3786, mitchell@atmos.washington.edu
)
JISAO data publications
