Influence of El Niño southern oscillation on precipitation variability in Northeast Thailand

This study investigates the influence of El Ni & ntilde;o Southern Oscillation (ENSO) on monthly precipitation anomaly (PPTA) in Northeast Thailand using 30 years (1993-2022) data obtained from 27 weather stations of the Thai Meteorological Department (TMD). Pearson correlation analysis elucidates the relationship between ENSO indices and PPTA. Results reveal significant correlations between ENSO indices and PPTA, providing insights into their intricate relationship. La Ni & ntilde;a events have a stronger relationship with PPTA than El Ni & ntilde;o events, with notable correlations observed. center dot Strong La Ni & ntilde;a phases, PPTA tends to increase across Northeast Thailand when Ni & ntilde;o 3, 3.4, and 4 are more strongly negative-0.64,-0.50, and-0.65, respectively. These correlations provide valuable insights into the hydrological influence of ENSO in Thailand. center dot After the ENSO event, there appears to be a 4-5 month lag period from the impact on PPTA that shows a higher correlation. center dot Wavelet transform coherence (WTC) analysis dissects the temporal and frequency-specific nature of the relationship between ENSO and PPTA found during the frequency of 2-7 years. These findings underscore the importance of studying regional variations in ENSO impacts for PPTA in Northeast Thailand.