Local air pollution from oil rig emissions observed during the airborne DACCIWA campaign

Vanessa Brocchi 1 Gisele Krysztofiak 1 Adrien Deroubaix 2, 3 Greta Stratmann 4 Daniel Sauer 4 Hans Schlager 4 Konrad Deetz 5 Guillaume Dayma 6 Claude Robert 1 Stéphane Chevrier 1 Valéry Catoire 1
1 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
2 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
4 IPA - DLR Institut für Physik der Atmosphäre
5 IMK - Institute for Meteorology and Climate Research
6 ICARE - Institut de Combustion, Aérothermique, Réactivité et Environnement
Abstract : In the framework of the European DACCIWA (Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa) project, the airborne study APSOWA (Atmospheric Pollution from Shipping and Oil platforms of West Africa) was conducted in July 2016 to study oil rig emissions off the Gulf of Guinea. Two flights in the marine boundary layer were focused on the floating production storage and offload-ing (FPSO) vessel operating off the coast of Ghana. Those flights present simultaneous sudden increases in NO2 and aerosol concentrations. Unlike what can be found in flaring emission inventories, no increase in SO2 was detected, and an increase in CO is observed only during one of the two flights. Using FLEXPART (FLEXible PARTicle dispersion model) simulations with a regional NO2 satellite flaring inventory in forward-trajectory mode, our study reproduces the timing of the aircraft NO2 enhancements. Several sensitivity tests on the flux and the injection height are also performed, leading to the conclusion that a lower NO2 flux helps in better reproducing the measurements and that the modification of the injection height does not impact the results of the simulations significantly.
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Vanessa Brocchi, Gisele Krysztofiak, Adrien Deroubaix, Greta Stratmann, Daniel Sauer, et al.. Local air pollution from oil rig emissions observed during the airborne DACCIWA campaign. Atmospheric Chemistry and Physics, European Geosciences Union, 2019, 19 (17), pp.11401-11411. ⟨10.5194/acp-19-11401-2019⟩. ⟨insu-02284833⟩

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