Preprints
https://doi.org/10.5194/essd-2022-126
https://doi.org/10.5194/essd-2022-126
 
03 May 2022
03 May 2022
Status: a revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

Oil slicks in the Gulf of Guinea – 10 years of Envisat ASAR observations

Zhour Najoui1, Nellya Amoussou3, Serge Riazanoff1,2, Guillaume Aurel1, and Frédéric Frappart4 Zhour Najoui et al.
  • 1VisioTerra, 14 rue Albert Einstein Champs-sur-Marne, France
  • 2Université Gustave Eiffel – Institut Gaspard Monge -IGM, 5 boulevard Descartes, Champs sur Marne
  • 3Université de Sorbonne Université - Laboratoire d’Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), 4 Place Jussieu, 75005 Paris
  • 4INRAE, ISPA, UMR 1391 INRAE/Bordeaux Sciences Agro, Villenave d'Ornon, France

Abstract. Gulf of Guinea is a very active area regarding maritime traffic as well as oil and gas exploitation (platforms). As a result of some actors of both sectors that fail to comply with environmental standards, the region is subject to a large number of oil pollutions. This study aims to detect oil slicks spilled in the Gulf of Guinea and analyse their spatial distribution using Synthetic Aperture Radar (SAR) images. If previous works have already locally mapped oil slicks in this area, this study is the first one to achieve a global statistical analysis based on a very high number of radar images covering 17 Exclusive Economic Zones of the Gulf of Guinea. To carry out the present study, a database of 3,644 SAR images, collected between 2002 and 2012 by the Advanced SAR (ASAR) sensor onboard the European Spatial Agency (ESA) Envisat mission has been used. This database allowed the identification of 18,063 oil slicks. These "Oil slicks" herein detected regroup: "oil spills" – of anthropogenic origin- and "oil seeps" – of natural origin (natural oil reservoir leaks).

Zhour Najoui et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-126', Anonymous Referee #1, 05 Jun 2022
    • AC1: 'Reply on RC1', Zhour Najoui, 28 Jul 2022
  • RC2: 'Comment on essd-2022-126', Anonymous Referee #2, 06 Jun 2022
    • AC2: 'Reply on RC2', Zhour Najoui, 28 Jul 2022
  • RC3: 'Comment on essd-2022-126', Chuanmin Hu, 19 Jun 2022
    • AC3: 'Reply on RC3', Zhour Najoui, 28 Jul 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-126', Anonymous Referee #1, 05 Jun 2022
    • AC1: 'Reply on RC1', Zhour Najoui, 28 Jul 2022
  • RC2: 'Comment on essd-2022-126', Anonymous Referee #2, 06 Jun 2022
    • AC2: 'Reply on RC2', Zhour Najoui, 28 Jul 2022
  • RC3: 'Comment on essd-2022-126', Chuanmin Hu, 19 Jun 2022
    • AC3: 'Reply on RC3', Zhour Najoui, 28 Jul 2022

Zhour Najoui et al.

Data sets

Spatial distribution of oil slicks in the Gulf of Guinea between 2002 and 2012 Zhour NAJOUI https://doi.org/10.5281/zenodo.6470470

Zhour Najoui et al.

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Short summary
Gulf of Guinea is a very active area regarding maritime traffic as well as oil and gas exploitation (platforms). As a result of some actors of both sectors that fail to comply with environmental standards, the region is subject to a large number of oil pollutions. This study aims to detect oil slicks spilled in the Gulf of Guinea and analyse their spatial distribution using satellite data.