Model results

Observed data . Reanalysis . Satellite data . Model results

NAO

NAO signal

Experiments with global climate models

LMD 5.3 & OPA 7

Data Analysis

Referemce:

Bojariu, R., L.Gimeno, 2003: Predictability and numerical modelling of the North Atlantic Oscillation. Earth Science Reviews, Vol 63/1-2, 145-168.

LMD 5.3, an AGCM, forced with SSTs for the interval 1979-1993 (45 winter months)
LMD 5.3 model coupled with OPA7, an oceanic GCM (75 winter months beginning with the 6 th simulated winter).

The analyzed data: winter months (December, January, February)

Simulated data:

ERA reanalysis (1979-1993):

Experiment	Cumulated variance of the first 5 EOFs (%)		Correlation coefficient associated with the CCA mode	Variance associated with the CCA mode (%)
Experiment	SLP	T	Correlation coefficient associated with the CCA mode	SLP	T
Observed	68	77	0.96	20	13
Forced	69	56	0.93	20	16
Coupled	65	53	0.57	18	14