Impact of El Niño Southern Oscillation on the first inter-monsoon rainfall over Sri Lanka in the post-El Niño years

• DOI: 10.3389/fclim.2024.1361322
• Publication Date: 2024-04-15T04:18:40Z
• Authors: K. R. K. D. Nadee...; Youichi Kamae
• Keywords: Sri lanka; Anomaly (physics); Wet season

Sri Lanka has a tropical monsoon climate. The first intermonsoon (FIM) season is one of four rainfall seasons. Previous investigations have explored the concurrent ramifications El Niño Southern Oscillation (ENSO); however, its impact on seasonal patterns in country post-El years remains unexplored. This study aims to investigate anomalous FIM during years. Weather station data from Department Meteorology for 114 stations 1975–2019, Japanese 55-year reanalysis data, and COBE sea surface temperature were used this study. A significant negative correlation between at most preceding year’s November, December, January Niño3.4 index (NDJ Niño3.4) was identified season. All three super events two strong agree with above results, showing clear anomaly pattern. Indo-western Pacific Ocean Capacitor effect as cause reduction contrast, 1988 exhibited positive anomaly. rapid transition La Niña associated atmospheric conditions contributors these features. findings will help overcome research gap improve accuracy forecasts country.