Rainfall Characteristics and Correlation of Rainfall Anomaly with Outgoing Longwave Radiation in Seven Province of the Indonesian Food Production Center

The study of rainfall characteristics will help in understanding climate conditions. the information on climate conditions in the planting season will help in managing the farming system such as determining the type of plant that is suitable for development in an area. To obtain an overview of conditions on the surface, it is necessary to study the spatial and temporal characteristics of diurnal and monthly rainfall variations from surface observations. The characteristics of diurnal rainfall can be characterized by patterns of intensity, and peak time of rainfall and the characteristics of monthly rainfall can be characterized by wet months, dry months, climate types and rainfall patterns. Based on the analysis correlation of rainfall anomaly with Outgoing Longwave Radiation (OLR) expected to give a more comprehensive picture of factors influence climate characteristics in seven provinces of food production centers. Based on the analysis of rainfall characteristics, the average annual rainfall in the western region is relatively wetter (> 2500 mm year-1) shifting to the middle region The dominant rainfall pattern at the study site is the Monsunal pattern. Some stations in West Java have local and equatorial rainfall patterns including Bogor, Cianjur, Plered. The characteristics of diurnal rainfall during rainy peaks in Lampung occur between 17:00 - 18:00, in West Java the peak of rain occurs between 15:00 - 17:00 in the Central Java I and III sapron in sapron I and II occurring during the day between 13:00 - 15:00. When the peak rains on. Kalimantan has two rain peaks namely afternoon; 14.00 - 15.00 and night; 22:00 - 01:00 In East Nusa Tenggara the peak of rain is 12.00 - 14.00 and in Southeast Sulawesi the peak of rain is between 13.00 - 15.00. Rainfall anomaly in Bogor and Plered two stations in West Java is negatively correlated with OLR index, meaning that the characteristics of rainfall in Bogor and Plered are influenced by local components. Negative correlations between rainfall anomalies and OLR were also found in East Kalimantan, namely Kebun Tabara and Muara Wahau stations. Areas with rainfall diversity that are not only influenced by global components need to be explored further to find out what local components affect the characteristics of rainfall in the region.