Abstract
Oil spills have immediate adverse effects on marine ecological functions. Accurate assessment of the damage caused by the oil spill is of great significance for the protection of marine ecosystems. In this study the observation data of Chaetoceros and shellfish before and after the Penglai 19-3 oil spill in the Bohai Sea were analyzed by the least-squares fitting method and radial basis function (RBF) interpolation. Besides, an oil transport model is provided which considers both the hydrodynamic mechanism and monitoring data to accurately simulate the spatial and temporal distribution of total petroleum hydrocarbons (TPH) in the Bohai Sea. It was found that the abundance of Chaetoceros and shellfish exposed to the oil spill decreased rapidly. The biomass loss of Chaetoceros and shellfish are 7.25×1014~7.28×1014 ind and 2.30×1012~2.51×1012 ind in the area with TPH over 50 mg/m3 during the observation period, respectively. This study highlights the evaluation of ecological resource loss caused by the oil spill, which is useful for the protection and restoration of the biological resources following the oil spill.
Highlights
The objectives of this paper are: (1) clarifying the changes in the abundance of Chaetoceros, fish larvae and shellfish after the oil spill; (2) exploring the relationship between the mortality and total petroleum hydrocarbons (TPH); (3) evaluating the biomass loss caused by the oil spill based on radial basis function (RBF) interpolation and oil spill adjoint model
C abundances denotes the of concentration of TPH; t is the time; y, z are of the Chaetoceros and shellfish before andx,after the components oil spill are shown
C = ∑ Ci n i=1 before and after the oil spill, fish larvae (Table 1), Chaetoceros and shellfish were observed was observed after the spill in June and July
Summary
Oil slicks over the sea surface limit gas exchange through the air-sea interface, and reduce light penetration into the water column, and resultant affecting the photosynthesis of phytoplankton [2]. The petroleum hydrocarbons are further enriched by marine organisms and amplified along the food chain, and harming human health due to their mutagenic or carcinogenic activity [5,6]. Oil spills affect the growth of marine organisms, disrupt the ecological mechanism and reproduction of the ocean [7,8], and result in environmental and economic damage to fisheries and human health [9,10]. Accurate assessment of the damage caused by the oil spill is of great significance
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