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Impact of a coastal-trapped wave on the near-coastal circulation of the Peru upwelling system from glider data

Abstract : alongshore velocity data from a glider repetitive section off the coast of Peru (14°S) are used to study the cross-shore structure and temporal variability of the Peru current system during a 5 week period in April-May 2010. Besides providing substantial information on the surface frontal jet associated with the Peru Coastal Current and the surfacing Peru-Chile Undercurrent that flows poleward trapped on the continental shelf and slope, the glider data reveal the presence of an intense deep equatorward current, which transports up to ˜2.5 Sv. The dynamics of this current are investigated using an eddy-resolving regional model. The variability of the vertically sheared alongshore flow is shown to be related to the passage of a poleward propagating coastal-trapped wave likely of equatorial origin. Solutions from a two-dimensional, linear, coastal wave model suggest that the alongshore current observed vertical structure is associated with the second and third baroclinic modes of the coastal-trapped wave.
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https://hal.archives-ouvertes.fr/hal-00991679
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Submitted on : Tuesday, January 4, 2022 - 2:52:27 PM
Last modification on : Monday, May 16, 2022 - 8:20:19 AM

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Alice Pietri, Vincent Echevin, Pierre Testor, Alexis Chaigneau, Laurent Mortier, et al.. Impact of a coastal-trapped wave on the near-coastal circulation of the Peru upwelling system from glider data. Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2014, 119, pp.2109-2120. ⟨10.1002/2013JC009270⟩. ⟨hal-00991679⟩

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