Publications des scientifiques de l'IRD

Kolodziejczyk N., Testor P., Lazar A., Echevin Vincent, Krahmann G., Chaigneau Alexis, Gourcuff C., Wade M., Faye S., Estrade P., Capet X., Mortier L., Brehmer Patrice, Schutte F., Karstensen J. (2018). Subsurface fine-scale patterns in an anticyclonic eddy off Cap-Vert Peninsula observed from glider measurements. Journal of Geophysical Research : Oceans, 123 (9), p. 6312-6329. ISSN 2169-9275.

Titre du document
Subsurface fine-scale patterns in an anticyclonic eddy off Cap-Vert Peninsula observed from glider measurements
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000447552600017
Auteurs
Kolodziejczyk N., Testor P., Lazar A., Echevin Vincent, Krahmann G., Chaigneau Alexis, Gourcuff C., Wade M., Faye S., Estrade P., Capet X., Mortier L., Brehmer Patrice, Schutte F., Karstensen J.
Source
Journal of Geophysical Research : Oceans, 2018, 123 (9), p. 6312-6329 ISSN 2169-9275
Glider measurements acquired along four transects between Cap-Vert Peninsula and the Cape Verde archipelago in the eastern tropical North Atlantic during March-April 2014 were used to investigate fine-scale stirring in an anticyclonic eddy. The anticyclone was formed near 12 degrees N off the continental shelf and propagated northwest toward the Cape Verde islands. At depth, between 100 and -400m, the isolated anticyclone core contained relatively oxygenated, low-salinity South Atlantic Central Water, while the surrounding water masses were saltier and poorly oxygenated. The dynamical and thermohaline subsurface environment favored the generation of fine-scale horizontal and vertical temperature and salinity structures in and around the core of the anticyclone. These features exhibited horizontal scales of O(10-30km) relatively small with respect to the eddy radius of O(150km). The vertical scales of O(5-100m) were associated to density-compensated gradient. Spectra of salinity and oxygen along isopycnals revealed a slope of around k(-2) in the 10- to 100-km horizontal scale range. Further analyses suggest that the fine-scale structures are likely related to tracer stirring processes. Such mesoscale anticyclonic eddies and the embedded fine-scale tracers in and around them could play a major role in the transport of South Atlantic Central Water masses and ventilation of the North Atlantic Oxygen Minimum Zone.
Plan de classement
Limnologie physique / Océanographie physique [032]
Description Géographique
ATLANTIQUE ; SENEGAL ; ZONE TROPICALE
Localisation
Fonds IRD [F B010074167]
Identifiant IRD
fdi:010074167
Contact