Correlation Analysis of Sea Level Temperature in Indonesian Waters Against Seasonal Rainfall in D. I. Yogyakarta

Abstract

Indonesia is a maritime continent country whose territory is surrounded by sea. Sea Surface Temperature (SST) affects the climatic conditions of a region. The effect of SST is not the same for every place and every seasons. D. I. Yogyakarta is a region that bordering the Indian Ocean, so a study is needed to determine the effect of SST for rainfall in the region for each seasons.  The result of study is very important for considerations in making rainfall forecasts. Correlation analysis was used to determine the effect of SST on rainfall in the D. I. Yogyakarta. The correlation coefisien in DJF, MAM ​​are negative-positive and JJA, SON are positive, the highest correlation coefisien ​​is in SON. There are three water areas in Indonesia that have a strong influence on seasonal rainfall in D. I. Yogyakarta. Three water areas in Indonesia are the southern of Java Island, southwest Sumatra and around the Maluku Islands. The highest percentage of correlation coefficient of 25 rain gauges for all seasons is SST in the Maluku Islands waters that the percentages are 60% (DJF), 56% (MAM), 56% (JJA) and 96% (SON). SST in Maluku Islands waters can be used as an indicator to predict JJA, SON rainfaal in D. I. Yogyakarta.