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Storms modify baroclinic energy fluxes in a seasonally stratified shelf sea: Inertial-tidal interaction

Hopkins, J.E. and Stephenson, G.R. and Green, J.A.M. and Inall, M.E. and Palmer, M.R (2014) Storms modify baroclinic energy fluxes in a seasonally stratified shelf sea: Inertial-tidal interaction. Journal of Geophysical Research, 119 (10). DOI: 10.1002/2014JC010011

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Abstract

Observations made near the Celtic Sea shelf edge are used to investigate the interaction between wind-generated near-inertial oscillations and the semidiurnal internal tide. Linear, baroclinic energy fluxes within the near-inertial (f) and semidiurnal (M2) wave bands are calculated from measurements of velocity and density structure at two moorings located 40 km from the internal tidal generation zone. Over the 2 week deployment period, the semidiurnal tide drove 28�48 W m�1 of energy directly on-shelf. Little spring-neap variability could be detected. Horizontal near-inertial energy fluxes were an order of magnitude weaker, but nonlinear interaction between the vertical shear of inertial oscillations and the vertical velocity associated with the semidiurnal internal tide led to a 25�43% increase in positive on-shelf energy flux. The phase relationship between f and M2 determines whether this nonlinear interaction enhances or dampens the linear tidal component of the flux, and introduces a 2 day counter-clockwise beating to the energy transport. Two very clear contrasting regimes of (a) tidally and (b) inertially driven shear and energy flux are captured in the observations.

Item Type: Article
Subjects: Research Publications
Departments: College of Natural Sciences > School of Ocean Sciences
Date Deposited: 24 Jul 2015 02:15
Last Modified: 23 Sep 2015 02:53
ISSN: 0148-0227
URI: http://e.bangor.ac.uk/id/eprint/4853
Identification Number: DOI: 10.1002/2014JC010011
Publisher: Wiley Online Library
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