Modelling and Validation of Polycyclic Aromatic Hydrocarbons Emissions from Offshore Oil Production Facilities

39 Pages Posted: 20 Jan 2024

See all articles by Manuel Aghito

Manuel Aghito

Norwegian Meteorological Institute

Daniela M. Pampanin

University of Stavanger

Raymond Nepstad

SINTEF Ocean

Lars Robert Hole

Norwegian Meteorological Institute

Øyvind Breivik

Norwegian Meteorological Institute

Abstract

The development of numerical models for investigating the risks and impact caused by human activities to the marine environment is important. Herein, the recently developed ChemicalDrift Lagrangian dispersion model was coupled to a toxicokinetic model and applied to investigate emissions of polycyclic aromatic hydrocarbons (PAHs) discharged from oil and gas production facilities as produced water. The performance of the model was evaluated with available data from a monitoring survey conducted at two oil fields. The survey provided exposure concentrations by means of passive samplers and bioaccumulation data in caged mussels; multiple depths and locations were assessed. The study included 26 PAHs and alkylated derivatives, showing good agreement between the model and the survey measurements. The compounds dominating the scenario were naphthalenes and phenanthrenes. Model provided contamination gradients were in agreement with the survey results, with levels decreasing with distance away from the main sources and with higher concentrations at 20 m depth. ChemicalDrift and the toxicokinetic model provided detailed time series, showing peaks of C1-naphthalene bioaccumulation significantly higher than values accumulated at the end of the monitored period. The utilised model was able to separate the relative contributions of multiple platforms and to identify the major contamination sources, providing a valuable and versatile tool for assessing the impact of discharges at sea.

Keywords: PAHs, produced water, environmental concentration, bioaccumulation, environmental monitoring

Suggested Citation

Aghito, Manuel and Pampanin, Daniela M. and Nepstad, Raymond and Hole, Lars Robert and Breivik, Øyvind, Modelling and Validation of Polycyclic Aromatic Hydrocarbons Emissions from Offshore Oil Production Facilities. Available at SSRN: https://ssrn.com/abstract=4700941 or http://dx.doi.org/10.2139/ssrn.4700941

Manuel Aghito (Contact Author)

Norwegian Meteorological Institute ( email )

Oslo
Norway

Daniela M. Pampanin

University of Stavanger ( email )

PB 8002
Stavanger, 4036
Norway

Raymond Nepstad

SINTEF Ocean ( email )

Norway

Lars Robert Hole

Norwegian Meteorological Institute ( email )

Oslo
Norway

Øyvind Breivik

Norwegian Meteorological Institute ( email )

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