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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Feb 2019

Research article | 05 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

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

Vanessa Brocchi1, Gisèle Krysztofiak1, Adrien Deroubaix2, Greta Stratmann3, Daniel Sauer3, Hans Schlager3, Konrad Deetz4, Guillaume Dayma5, Claude Robert1, Stéphane Chevrier1, and Valéry Catoire1 Vanessa Brocchi et al.
  • 1Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (LPC2E), CNRS – Université Orléans – CNES, 45071 Orléans cedex 2, France
  • 2LMD and LATMOS, École Polytechnique, Université Paris Saclay, ENS, IPSL Research University; Sorbonne Universités, UPMC Univ Paris 06, CNRS, Palaiseau, France
  • 3Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft und Raumfahrt, Oberpfaffenhofen, Germany
  • 4Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
  • 5Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS, 45071 Orléans cedex 2, France

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 offloading (FPSO) vessel operating off the coast of Ghana. Those flights present simultaneous sudden increases of NO2 and aerosols 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 simulations in forward trajectory mode, our study reproduced the timing of the aircraft NO2 enhancements. We used a regional NO2 satellite flaring inventory in the simulations, which showed an overall good estimate of flaring emission. Several sensitivity tests on the flux and the injection height were also performed to better reproduce the measurements.

Vanessa Brocchi et al.
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Status: open (until 30 Apr 2019)
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Vanessa Brocchi et al.
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Publications Copernicus
Short summary
This study reports the first flaring in-situ measurements in southern West Africa. According to the measurements, oil rig flaring plumes in Ghana lead to increases in NO2 and aerosols but not always in CO and not in SO2. Flaring measurements can be reproduced using FLEXPART model, adjusting both the emission flux and the injection height. The DACCIWA satellite flaring inventory provides a reasonable estimate of flaring emission.
This study reports the first flaring in-situ measurements in southern West Africa. According to...