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Impact of the “Tianjin 8.12 Explosion” on Chlorophyll-a Concentration in the Bohai Sea

In this study, we will discuss the spatial and temporal variation of the chlorophyll-a concentration (Chl-a) in the Bohai Sea. All Chl-a data is derived from Aqua satellite MODIS (Moderate Resolution Imaging Spectroradiometer) visible ocean color data during the period from 2003 to 2020. The Empirical Orthogonal Function (EOF) analysis is applied to see the dominant patterns of the Chl-a variation in the study area. The results show that the first three modes can be used to predict the main characteristics of temporal and spatial variation of Chl-a in the Bohai Sea. The higher Chl-a is mainly along the coastal areas, while the much lower Chl-a is in the offshore areas. The river flow into the Bohai Sea and the sea surface temperature have a certain impact on the variation of Chl-a concentration. It has 5.88, 6.06 and 11.76 months period. Based on the temporal amplitude of Chl-a in the Bohai Sea, the vibrations of Chl-a concentration in 2015 is gently. No distinguished changes of Chl-a related to the explosion are observed in this study. However, long term monitor of aquatic system of Bohai Sea especially in the sea area around the explosion location is suggested.