Publications des scientifiques de l'IRD

Sohou Z., Kone V., Da-Allada Y. C., Djakoure S., Bourlès Bernard, Racape V., Degbe G., Adje C. (2020). Seasonal and inter-annual ONSET Sea Surface Temperature variability along the northern coast of the Gulf of Guinea. Regional Studies in Marine Science, 35, p. art. 101129 [11 p.]. ISSN 2352-4855.

Titre du document
Seasonal and inter-annual ONSET Sea Surface Temperature variability along the northern coast of the Gulf of Guinea
Année de publication
2020
Type de document
Article référencé dans le Web of Science WOS:000525758600016
Auteurs
Sohou Z., Kone V., Da-Allada Y. C., Djakoure S., Bourlès Bernard, Racape V., Degbe G., Adje C.
Source
Regional Studies in Marine Science, 2020, 35, p. art. 101129 [11 p.] ISSN 2352-4855
The aim of this study is to characterize the coastal upwelling variability at seasonal and inter-annual time scales in the northern Gulf of Guinea (NGoG) using Sea Surface Temperature (SST) collected with autonomous "ONSET" thermometers. Results show that the ONSET SST data are suitable for numerical model evaluation, and provide relevant information in addition to satellite and reanalysis data at seasonal cycle. The minor and major coastal upwellings are present in all the products. The interannual SST variability is more pronounced in the western part of the region (Cote d'Ivoire and Ghana) than in the eastern part (Benin and Nigeria). The pattern differences between the west and the east of the region highlight a large spatial variability of the SST in the NGoG. Indeed, the signal of the minor upwelling season is visible only in the west of the basin, namely between Cape Palmas and Cape Three Points. We also observe a well-established thermal gradient between the western and eastern parts of the basin. This gradient is increasing from west to east during the major upwelling season, and decreasing from east to west during the rest of the year. The coastal ONSET data allow to evidence higher SST anomalies than those deduced from satellite and reanalysis products. Although the cold or warm events observed in 2008, 2010 and 2012 are well detected by all products, only the ONSET data set reveal the strong negative SST anomaly observed in 2009 along the coast of Ghana and Cote d'Ivoire.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Télédétection [126]
Description Géographique
ATLANTIQUE ; GUINEE GOLFE ; NIGERIA ; BENIN ; GHANA ; COTE D’IVOIRE
Localisation
Fonds IRD [F B010078985]
Identifiant IRD
fdi:010078985
Contact