Type of event:
Monsoon characteristics in the Maritime Continent have been mainly studied in terms of rainfall pattern, leading to differences in both approaches and methods, as well as the results. In this study, satellite-derived rainfall, and wind and moisture field reanalysis data were analysed to obtain the annual and semi-annual cycles related to the monsoon in the Maritime Continent. In this case, coefficients obtained from harmonic analysis of rainfall data and Vertically Integrated Moisture Transport (VIMT) convergence were used to define rainfall type zonation in Indonesia. The results show that areas of dominant annual pattern agree well with those of previous studies. Additionally, areas identified as mixed annual and semi-annual patterns are more consistent with local observations. Changes in rainfall patterns at interdecadal time-scale were also studied for some cases where long-term observational rainfall data are available. It is found that changes or shifts in rainfall patterns are explicable in terms of moisture transport variations.
Dr Hadi is a lecturer at Faculty of Earth Sciences and senior researcher at Centre for Climate Change in atmospheric science at the Bandung Institute of Technology. He earned his doctorate from Kyoto University, Japan in 2002. His research interests include mesoscale meteorology, regional climate dynamics, weather and climate forecasting and risk analysis/modelling.