THE INFLUENCE OF THE INDIAN OCEAN DIPOLE (IOD) PHENOMENON ON SEA SURFACE TEMPERATURE AND CHLOROPHYLL-A IN THE SUNDA STRAIT

Abstract

The Indian Ocean Dipole (IOD) interannual ocean-atmosphere anomaly phenomenon impacts marine ecology in the Sunda Strait region. This study aims to analyze the influence (impact) of IOD on sea surface temperature (SST) and chlorophyll-a (Chl-a) in the Sunda Strait. Monthly time series data from 2006-2020 (15 years) were obtained from marine copernicus, and analyzed using Pearson Correlation, XWT (Cross Wavelet Transform), and WTC (Wavelet Coherence Transform) methods. The results showed that for 15 years (2006-2020) the SPL ranged from 27.63°C-30.55°C and Chl-a ranged from 0.082 ?g/L- 3.611 ?g/L. In the Western Season (JJA) and Transitional I (MAM), SPL tends to be warm and Chl-a is low, while in the Eastern Season (DJF) and Transitional II (SON) SPL tends to be cold and Chl-a is high. During IOD+, SPL is relatively low and Chl-a is high, while during IOD-, SPL tends to be high and Chl-a is low. Pearson correlation analysis shows a weak relationship between SPL-IOD (-0.2627) and Chl-a-IOD (0.3794). The results of XWT and WTC analysis show a strong relationship between SPL and Chl-a to the IOD.