Thermal Front in the North of Java Sea, Indonesia

Indian Ocean Dipole (IOD) is a phenomenon in the Indian Ocean caused by differences in the anomaly of Sea Surface Temperature (SST) between the West Coast of Sumatra and the East Coast of Africa. The phase difference of the formation of positive IOD (+) and negative IOD (-). The IOD phase can be known by using the Dipole Mode Index (DMI). This research aims to identify the effect of IOD phase on SST and distribution thermal front. Identification of distribution using the Pearson method, and analysis of the distribution thermal front using the Single Image Detection (SIED) method. Area research in North Java Seas during wet season 2013-2015. IOD phase with normal condition more often occure than IOD phase with weakly condition. Strong correlation occurred with negative direction, and moderate correlation occured with positive direction. Meanwhile, correlation IOD with rainfall not significant or uncorrelation. During five years the heat temperature was concentrated in the coastal area. IOD with normal condition has a larger thermal front area 1976 km2, while IOD with weakly condition has a 624 km2 thermal front area. Thermal front distribusion more often occure on north area of Central Java with a longwise and widing distribusion.