ANALISIS FENOMENA INDIAN OCEAN DIPOLE (IOD) POSITIF TAHUN 2012 DAN IOD NEGATIF TAHUN 2010 MENGGUNAKAN DATA SATELIT
Daftar Isi:
- Indian Ocean Dipole (IOD) is an inherent coupled climate mode in the tropical Indian Ocean having impact on the distribution of rainfall over the surrounding continents. This research is designed to examine the dynamics of the evolution of the 2012 positive IOD and 2010 negative IOD events using data obtained from the satellite remote sensing. The climate parameters (e.g. Sea Surface Temperature – SST, rainfall, surface winds and sea level pressure) are analyzed to evaluate the detail evolution of the events. The results showed that the 2012 positive IOD event developed in July, peaked in August when the DMI reached its maximum value of 1.05C, and terminated in October 2012. It was noted that during the 2012 positive IOD event, negative SST anomalies were observed in the southeastern tropical Indian Ocean associated with the southeasterly winds along the southern coast of Sumatra and Java and the easterly winds along the equator. As a result, there was a westward shift of the convection zone leading to deficit rainfall over the Indonesian region. Meanwhile, the 2010 negative IOD event developed in July-August, peaked in September/October as the DMI reached its minimum value of -0.87, and terminated in November. During the 2010 negative IOD event, warm SST anomalies were observed in the southeastern tropical Indian Ocean. Strong westerly wind along the equator and northwesterly winds along the southern coast of Sumatra and Java forced downwelling Kelvin waves that induced warm SST to the eastern tropical Indian Ocean.