In view of the relationship between the variability of rainfall during each season
represented by PC1 to SST anomalies in various months, we perform lead-lag
correlation analysis to further investigate. The SST anomalies in Pacific
Ocean were averaged, and used them to determine the relationships with the variability of
rainfall over Thailand. Whereas, Nino3 and Nino3.4 area representing
ENSO phenomenon (Trenberth and Stepaniak, 2001) was used to determine the lead-lag
correlations. The positive
correlation means that the increasing (decreasing) of SST anomalies in that area related to
rising (reducing) of the rainfall variability magnitude indicating more (less) rainfall over Thailand. While,the negative correlation means that the increasing (decreasing) of SST anomalies in that area related to
rising (reducing) of the rainfall variability magnitude indicating more (less) rainfall over Thailand.