Simulated distribution and ecotoxicity-based assessment of chemically-dispersed oil in Tokyo Bay

Koyama, Jiro; Imakado, Chie; Uno, Seiichi; Kuroda, Takako; Hara, Shouichi; Majima, Takahiro; Shirota, Hideyuki; Añasco, Nathaniel C.

doi:10.1016/j.marpolbul.2014.04.001

Cited by 1 publication

(1 citation statement)

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“…Moreover, oil droplets are present in the regions affected by extent oil spills (Gong et al 2014). The oil pollution, primarily visible on sea surface, becomes dispersed as an effect of natural wave mixing and chemical dispersant treatment Koyama et al 2014;Prince et al 2013) making the oil more available for biodegradation and photodegradation (Saeed et al 2011;Agamy 2013, Frantzen et al 2015. While the fate of surface oil spills can be traced using remote techniques (Fingas and Brown 2014;Brekke and Solberg 2005).…”

Section: Introduction Dispersed Oil In Seawatermentioning

confidence: 99%

The effect of dispersed Petrobaltic oil droplet size on photosynthetically active radiation in marine environment

Haule

Freda

2015

Environ Sci Pollut Res

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Oil pollution in seawater, primarily visible on sea surface, becomes dispersed as an effect of wave mixing as well as chemical dispersant treatment, and forms spherical oil droplets. In this study, we examined the influence of oil droplet size of highly dispersed Petrobaltic crude on the underwater visible light flux and the inherent optical properties (IOPs) of seawater, including absorption, scattering, backscattering and attenuation coefficients. On the basis of measured data and Mie theory, we calculated the IOPs of dispersed Petrobaltic crude oil in constant concentration, but different log-normal size distributions. We also performed a radiative transfer analysis, in order to evaluate the influence on the downwelling irradiance Ed, remote sensing reflectance Rrs and diffuse reflectance R, using in situ data from the Baltic Sea. We found that during dispersion, there occurs a boundary size distribution characterized by a peak diameter d0 = 0.3 μm causing a maximum E d increase of 40% within 0.5-m depth, and the maximum Ed decrease of 100% at depths below 5 m. Moreover, we showed that the impact of size distribution on the "blue to green" ratios of Rrs and R varies from 24% increase to 27% decrease at the same crude oil concentration.

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