Chlorophyll-a variability during positive IOD - the east season period in 2019 in Padang Sea, Indonesia

Abstract

This study aimed to identify the effect of the positive Indian Ocean Dipole (IOD) phenomenon on the spatial, temporal distribution of chlorophyll-a concentrations in the East Season in Padang Sea in 2019. The method used in this research was the Kriging analysis method applied in oceanographic parameter satellite imagery extraction point data. By applying the method, we produced the maps of the spatial distribution variation of chlorophyll-a content and Sea Surface Temperature (SST). The data of IOD events in 2019 showed the occurrence of a strong positive IOD phenomenon that caused anomaly in the Sea Surface Temperature (SST) in Padang Sea. The interpretation of Aqua-Modis level 2 satellite image data showed that the sea surface temperature during the East Season was relatively cold, which was in the minimum temperature ranging from 18.5-22°C with a normal temperature condition of 28-29°C. The minimum chlorophyll-a concentration in the East Season was 0.252 mg/m3; while the maximum value reached 18.5 mg/m3. The distribution value of chlorophyll-a concentration was 1.028 mg/m3.The RMSe Cross Validation value obtained was 0.504 for SST and 0.363 for chlorophyll-a with a mean SST of -0.0005 and mean chlorophyll-a of -0.0039.

VARIABILITAS KONSENTRASI KLOROFIL-a DI PERAIRAN KALIMANTAN BARAT MENGGUNAKAN DATA MODIS AQUA

“…Sedangkan kabupaten dan kota yang berada di wilayah lintang selatan yaitu Kabupaten Kuburaya, Kabupaten Ketapang dan Kabupaten Kayong Utara memiliki nilai konsentrasi klorofil-a berturut-turut adalah 19,93 mg/m 3 ; 17,95 mg/m 3 ; dan 18,25 mg/m 3 . Perbedaan nilai konsentrasi klorofil-a dan luas sebaran dapat disebabkan adanya perbedaan kondisi hidrologi perairan, perubahan musim, kondisi arus, serta daerah aliran sungai (Jamshidi dan Bakar 2011;BIG 2015;Wernand et al 2013;Sabrina et al 2018;Pelly et al 2020).…”