The Influence of Indian Ocean Dipole (IOD) on The Variability of Sea Surface Temperature and Precipitation in Sumatera Island

Sumatera Island is located adjacent to the ocean and directly influenced by the dynamic of Indian Ocean. Indian Ocean Dipole (IOD) as one of the global climate factor has a big impact towards this dynamic. As it aims to get the influence of IOD towards Sumatera water area, high-resolution remote sensing data is needed. Those are Sea Surface Temperature (SST), precipitation, and Dipole Mode Index (DMI). DMI is calculated by the differentiation of SST anomaly. IOD condition is emphasized by using precipitation data. Area observed is divided into three areas which are in series West Sumatera water, East Sumatera water, and Bukit Barisan highland. During IOD negative, the precipitation values were estimated 5,43; 4,63; 4,5 mm/hr sequentially. Meanwhile, during IOD positive, those values were 2,74; 3,47; 3,11 mm/hr sequentially. It is shown that IOD has the impact of the precipitation values in Sumatera waters. By showing the higher value of IOD negative and the lower value on IOD positive. West Sumatera water is observed as the most influencing area by the dynamic of IOD. Topography is also influencing towards the precipitation and it is shown by its values weather on IOD negative or positive.