Evidence of wind-induced temperature anomalies in the tropical and subtropical North Atlantic Ocean in winter-spring 2010

• Main Authors: Troupin, Charles, Machín, Francis
• Other Authors: Centre Interfacultaire de Recherches en Océanologie - MARE, GeoHydrodynamics and Environment Research, Département d'Astrophysique, Géophysique et Océanographie
• Format: Conference Object
• Language: English
• Published: 2011
• Subjects: Temperature Anomalies; NAO; Physical; chemical; mathematical & earth Sciences; Earth sciences & physical geography; Physique; chimie; mathématiques & sciences de la terre; Sciences de la terre & géographie physique; North Atlantic; North Atlantic oscillation
• Online Access: https://orbi.uliege.be/handle/2268/89790

During the first months of 2010, the tropical and subtropical North Atlantic displayed anomalously high temperatures, with values seldom observed during the last decades. In situ and remote sensing data are used to evaluate horizontal, vertical and temporal extensions of the anomalies. The repercussions on the seasonal evolution of the mixed layer are examined; in particular, it is shown that the northwest Africa coastal upwelling is significantly weakened in comparison to previous years. The consequences on the biological variables are examined by means of satellite-derived measurements. A simple mechanism related to changes in wind intensity is proposed in order to explain our observations. The wind weakening coincides with a strongly negative value of the North Atlantic Oscillation index.