Yadari et al. (2026) The climatic evolution of the Inaouen River Basin in Morocco: Rainfall variability and its connection to the North Atlantic Oscillation

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Identification

• Journal: Springer Link (Chiba Institute of Technology)
• Year: 2026
• Date: 2026-01-15
• Authors: Sadik El Yadari, Abdelhamid Janati idrissi, Brahim Bougdira, Badr Layan, Said El Boute, Mohamed Ben Abbou
• DOI: 10.1051/bioconf/202621101003/pdf

Research Groups

Not specified in the provided text.

Short Summary

This study investigated the impact of the North Atlantic Oscillation (NAO) on rainfall variability in the Inaouene basin, revealing that the prevailing positive NAO phase since the late 1970s has largely contributed to drought conditions, though some extreme rainfall events show weak NAO correlation.

Objective

• To determine the impact of the North Atlantic Oscillation (NAO) on rainfall variability in the Inaouene basin.

Study Configuration

• Spatial Scale: Inaouene basin, Morocco, with specific reference to the Taza station.
• Temporal Scale: Multi-decadal, focusing on changes "since the end of the seventies" and analyzing periods of exceptional dry (as low as 252.2 mm) and rainy (up to 1129 mm) conditions.

Methodology and Data

• Models used: Standardized Precipitation Index (SPI) calculation, correlation coefficient calculation.
• Data sources: Rainfall records (e.g., Taza station), North Atlantic Oscillation index (implied), and atmospheric factors controlling atmospheric circulation.

Main Results

• The Inaouene basin experiences significant rainfall variability, with recorded annual precipitation ranging from 252.2 mm (dry) to 1129 mm (rainy) at the Taza station.
• The dominance of the positive phase of the North Atlantic Oscillation (NAO) since the late 1970s has been a major factor in the absence of moist air masses towards Morocco.
• This led to stable climatic conditions of drought in the study area.
• Some extreme rainfall events occurred, but their evidence of correlation with the North Atlantic Oscillation was weak.

Contributions

• Quantifies the influence of the North Atlantic Oscillation on rainfall variability and drought conditions within the Inaouene basin.
• Highlights the specific role of the positive NAO phase in driving regional drought since the late 1970s.
• Identifies instances of extreme rainfall events that are not strongly coupled with NAO, suggesting other contributing atmospheric factors.

Funding

Not specified in the provided text.

Citation

@article{Yadari2026climatic,
  author = {Yadari, Sadik El and idrissi, Abdelhamid Janati and Bougdira, Brahim and Layan, Badr and Boute, Said El and Abbou, Mohamed Ben},
  title = {The climatic evolution of the Inaouen River Basin in Morocco: Rainfall variability and its connection to the North Atlantic Oscillation},
  journal = {Springer Link (Chiba Institute of Technology)},
  year = {2026},
  doi = {10.1051/bioconf/202621101003/pdf},
  url = {https://doi.org/10.1051/bioconf/202621101003/pdf}
}