| a) Daily
NAO index (1 Jan. 1989 to 30 Dec. 1997) |
|
|
| 3 |
|
| 1 |
|
| -1 |
|
| -3 |
|
| 1989 1990 1991
1992
1993 1994 1995 1996 1997 1998 |
| b) Accumulated
Daily NAO index (1 Jan. 1989 to
30 Dec. 1997) |
|
|
| 400 |
|
| 200 |
|
| 0 |
|
| 1989 1990 1991
1992
1993 1994 1995 1996 1997 1998 |
| Note the persistence in a) and the slow predictable movement
in b). |
