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 variable Correlation with Sahel precipitation Effective sample size SAL pressure −0.68 9 SAL latitude 0.44 10 SAL longitude 0.16 17 AZH pressure −0.17 29 AZH latitude −0.05 51 AZH longitude −0.41 43 SOI (1951–1998) 0.34 48