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El Nino is one of the global phenomena that has affected the climate system of Indonesia, including Ambon Island of Maluku. One of the direct impacts of the El Nino phenomenon is the decrease of water availability on agricultural land. This study aimed: i) to analyze the period of El-Nino extreme rainfall events in Ambon Island as well as the intensity and its frequency; and ii) to analyze the impact of El Nino events on the water balance of agricultural lands on Ambon Island. Sixty years of climatic data period 1959-2018 from Pattimura Meteorological Station and Karang Panjang Geophysics Station were used to analyze extreme rainfall conditions of El Nino, and to calculate the water balance of land using the methods of Thornthwaite and Mather (1957). The results showed that 16 times El Nino events occurred in Ambon between 1959 and 2018, with the frequency of 1-7 times per year or four times per year. The most extreme El Nino events that occurred in Ambon were in 1977, 1987 and 1997. The results of land water balance calculation during the El-Nino events showed seven months water deficit (September to March) which is 62,6% higher than the normal conditions; meanwhile, the optimum soil moisture occurred four months (June to September) or seven months shorter than the normal conditions which were 11 months (March to January).

Analisis Fenomena El Nino dan Dampaknya Terhadap Neraca Air Lahan di Pulau Ambon