y = 1.39x - 0.23

R2 = 0.67

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5

PDO Index

Rad

iati

ve F

orc

ing

(W

/m2)

Model predicted

Satellite-Observed

LW+SW

2000

2001

2003

2007

2005

2008?