a)
g
-i
E
0
c:
. .
.,
2
!"
8.
E
$
~
{1
"
. .
. .
.,
(/)
b)
&ON
JOS
267
Observed
Index region: 170E-I60W.2SN-40N ; 5 year running mean; deltended
0.5 .-----~-.-----~------.,r__---_,
0.3
0.1
-0.1
.{)·~9L 50 ----~ 19-!-: 60 -:----~19:':7:::-0-----:1:: 980:::------:':-! 9·90
Year
Observed
~l'~ ' ~ ' ~~~~~~ __ . ~ .:~ .. _ , _ ,,_ ,,_ . --: ,,~ := ,,~_~ : = ,,_ . _ ,,_ ,,_ . ~ ,,~ : = ,,_ . _ . _~;-_-.~~
140E
180[
180
l 60W
140'1
120.
lCOW
Figure 1: Observed low-pass filtered (retaining variability on time scales longer than 5
years) SST anomalies averaged over the North Pacific (25°N - 45°N, 1700E - 1600W)
for the period 1950-1990, as derived from the GISST data set. b) Spatial distribution of
correlation coefficients of the index time series shown in (a) and SST anomalies in the
Pacific.