The characteristics of Indian Ocean Dipole mode premilinary study of the monsoon variability in the western part of Indonesian region.

Prediction of El-Nino and Southern Oscillation (ENSO) phenomena in Indonesia, generally is corresponded to the Sea Surface Temperature anomaly (SSTa) and Southern Oscillation Index (SOI) along West to East Pacific Ocean between Darwin (Australia) and Tahiti (Hawai Islands). This phenomena is assumed having a good correlation with the moving average of convective activity, especially in the western part of Indonesia region which always covered by giant clouds like Cumulonimbus (Cb). Since only a few atmospheric and oceanography data in this region, we tried to investigate in this paper the preliminary results of the characteristics of Indian Ocean Dipole (IOD). We used the Sea Surface Temperature (SST), Sea Level Pressure (SLP) and Outgoing Longwave Radiation (OLR) of Dipole Mode Index (DMI) anomaly. By applying the spectrum method, we found that the most predominant peak of these parameters are three months oscillation such as on SST and SLP data analysis. While, for OLR data, the most predominant peak is six months oscillation. We suspect these phenomena are correspond the transition season from dry to rainy season for SST and SLP, and Monson season for OLR.