Interaction between madden-julian oscillation and monsoon related to big floods over south sulawesi in january 2019

Abstract

Study of interaction between MJO and Monsoon and their impact on the extreme rainfall over the Maritime Continent (MC) until now not yet fully understood due to the limitation of data observation. However, there many techniques to derive the extreme rainfall from the satellite data, especially for GSMap (Global Satellite Mapping of Precipitation) that already designed with good spatial-temporal resolution. In this study, we have investigated the interaction between MJO and Asian Monsoon when they are interactive simultaneously. By taking the Makasar city as a sample of big floods over South Sulawesi dated January 22, 2019, we found a good agreement between MJO, Monsoon, and their impact on the extreme rainfall in that time. We applied four techniques, namely; temporal, spatial, Hovmoller, and PSD (Power Spectral Density), respectively. Then, we found the MJO in phases 4 and 5 were responsible for the occurring of big rainfall over South Sulawesi. For this reason, we suspect the development of the MJO index model, especially for phases 4 and 5 when passing over South Sulawesi is very important for the next investigation.