Table 1: COA variable, corresponding correlation coefficient with Sahel precipitation, and effective sample size. Bold: value statistically significant at the 5% level. The Azores High and South Asia data are for 1948–1998, and the SOI values are for 1951–1998.

COA variableCorrelation with Sahel precipitationEffective sample size

SAL pressure−0.689
SAL latitude0.4410
SAL longitude0.1617
AZH pressure0.1729
AZH latitude0.0551
AZH longitude−0.4143
SOI (1951–1998)0.3448