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Temporal evolution of the momentum balance terms and frictional adjustment observed over the inner shelf during a storm

AutorGrifoll, Manel; Aretxabaleta, Alfredo L. ; Pelegrí, Josep Lluís ; Espino, Manuel
Fecha de publicación18-ene-2016
EditorEuropean Geosciences Union
CitaciónOcean Science 12(1): 137-151 (2016)
ResumenWe investigate the rapidly changing equilibrium between the momentum sources and sinks during the passage of a single two-peak storm over the Catalan inner shelf (NW Mediterranean Sea). Velocity measurements at 24 m water depth are taken as representative of the inner shelf, and the cross-shelf variability is explored with measurements at 50 m water depth. During both wind pulses, the flow accelerated at 24 m until shortly after the wind maxima, when the bottom stress was able to compensate for the wind stress. Concurrently, the sea level also responded, with the pressure-gradient force opposing the wind stress. Before, during and after the second wind pulse, there were velocity fluctuations with both super- and sub-inertial periods likely associated with transient coastal waves. Throughout the storm, the Coriolis force and wave radiation stresses were relatively unimportant in the along-shelf momentum balance. The frictional adjustment timescale was around 10 h, consistent with the e-folding time obtained from bottom drag parameterizations. The momentum evolution at 50 m showed a larger influence of the Coriolis force at the expense of a decreased frictional relevance, typical in the transition from the inner to the mid-shelf
Descripción15 pages, 8 figures
Versión del editorhttp://dx.doi.org/10.5194/os-12-137-2016
Identificadoresdoi: 10.5194/os-12-137-2016
issn: 1812-0784
e-issn: 1812-0792
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