Linking the North Atlantic Oscillation to rainfall variability and dynamics in Algeria through GIS and wavelet theory.

ABSTRACT: This study presents a regionalized analysis of the relationship between the North Atlantic Oscillation (NAO) and rainfall across 69 monthly rainfall stations in northeastern Algeria for the period 1970-2007. The approach integrates Cross-Wavelet Transform (XWT) and Wavelet Coherence Transform (WCT), complemented by Hierarchical Ascending Classification (HAC) and Geographic information system (GIS), to address dissimilarity issues and to identify coherent spatiotemporal patterns between the NAO and regional rainfall variability. Results indicate strong and persistent coherence in the northern region, particularly within the 4-16 and 16-32-month bands. The central region displays moderate and less stable coherence, whereas the southern region reveals weak and intermittent associations. The f

SUBMITTER: Zerouali B 

PROVIDER: S-EPMC12753787 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature