Impacts of the El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) events on the Indonesian rainfall were studied using observational data and the NCEP/NCAR reanalyzing global data. ENSO and IOD variability in the time-periods are detected by using wavelet analysis, and we attempt composite analysis of the rainfall amounts over Indonesia during ENSO and IOD events. The correlation between strong El Niño intensities and several regions in Indonesia with rainfall below normal (< 85%) are high, but when the intensities are weak the correlation becomes low. In this case other phenomena such as IOD can contribute to drought in Indonesia. Our analysis also indicates that during El Niño and positive IOD events, the southeast monsoon (Australian monsoon) over Indonesia is intensified, causing the dry season longer than rainy season.
Bannu 1 , Hiroaki Kuze, Nobuo Takeuchi, and D.A. Suriamihardja
Source: Proceeding of The CEReS International Symposium on Remote Sensing, Maximization of the Use of Satellite Data for Understanding the Earth Environment, 2005.