Publications des scientifiques de l'IRD

Chen R., McWilliams J. C., Renault Lionel. (2021). Momentum governors of California undercurrent transport. Journal of Physical Oceanography, 51 (9), 2915-2932. ISSN 0022-3670.

Titre du document
Momentum governors of California undercurrent transport
Année de publication
2021
Type de document
Article référencé dans le Web of Science WOS:000752706700013
Auteurs
Chen R., McWilliams J. C., Renault Lionel
Source
Journal of Physical Oceanography, 2021, 51 (9), 2915-2932 ISSN 0022-3670
The California Undercurrent (CUC) transport, with significant variability ranging from weeks to decades, has consequences for both the climate and biogeochemistry of the California Current system. This study evaluates the governors of the CUC transport and its temporal variability from a momentum perspective, using a mesoscale-resolving regional model. From a 16-yr mean perspective, the along-isobath pressure gradient acts to accelerate the CUC, whereas eddy advection retards it. The topographic form stress, which is part of the volume integrated along-isobath pressure gradient, not only acts in the direction of the time-mean CUC, but also greatly modulates the temporal variability of the CUC transport. This temporal variability is also correlated with the eddy momentum advection. The eddy stress plays a role in transferring both the equatorward wind stress and poleward CUC momentum downward. A theory is formulated to show that, in addition to the conventional vertical redistribution of momentum, the eddy stress can also redistribute momentum horizontally in the area where the correlation between the pressure anomaly and isopycnal fluctuations has large spatial variability.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Limnologie physique / Océanographie physique [032]
Description Géographique
PACIFIQUE
Localisation
Fonds IRD [F B010084285]
Identifiant IRD
fdi:010084285
Contact