Spatial-temporal variation of anomaly chlorophyll-a in Southern Java and Nusa Tenggara using empirical orthogonal functionanalysis

Abstract

Data from Global Ocean Biogeochemistry models were used to study the spatial and temporal variation of sea surface chlorophyll-a in southern Java and Nusa Tenggara. Empirical Orthogonal Function (EOF) analysis was applied to decompose spatial and temporal mode of the anomaly chlorophyll-a. The first mode (58.7%) revealed strong interannual variation that had a significant correlation with the Indian Ocean Dipole (IOD) event. The Second mode (7.2%) of the temporal pattern showed seasonal periods while the spatial pattern showed the opposite phase between southern Java and Nusa Tenggara. The spatial pattern of mode 3 (5.2%) and 4 (2.7%) showed an interesting pattern where it showed strong variance in the exit way of Indonesian Trough Flow. However, it needs more study to conclude the phenomena that were revealed by mode 3 and 4.