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Shelfbreak upwelling induced by alongshore currents: analytical and numerical results

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  • Alongshore flow in the direction of propagation of coastal trapped waves can result in upwelling at the shelfbreak. The intensity of this upwelling can be comparable in magnitude to wind-driven coastal upwelling, with its associated ecological features. Recent numerical experiments by Matano & Palma indicate that this upwelling results from convergence of Ekman transport at the shelfbreak. The mechanism for this phenomenon can be understood in terms of steady solutions to the shallow water equations in the presence of Coriolis force and bottom drag. Matano & Palma interpreted their numerical results in terms of the arrested topographic wave, but did not present direct comparisons. Here we present a family of analytical solutions to the equations of the arrested topographic wave that shows striking quantitative agreement with earlier numerical results.
  • Keywords: Topographic effects, Ocean processes, Shallow water flows
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  • Miller, R. N., Matano, R. P., & Palma, E. D. (2011). Shelfbreak upwelling induced by alongshore currents: Analytical and numerical results. Journal of Fluid Mechanics, 686, 239-249. doi: 10.1017/jfm.2011.326
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  • 686
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  • R.N.M. acknowledges the support of Office of Naval Research grant number 1010423, National Science Foundation award number 0934956-OCE and award NA08NES4400013 from the National Oceanic and Atmospheric Administration, US Department of Commerce, to the Cooperative Institute for Oceanographic Satellite Studies (CIOSS) and the Joint Center for Satellite Data Assimilation (JCSDA). R.P.M. acknowledges the support of the National Science Foundation through grants OCE-0726994 and OCE-0928348and of NASA through grant NNX08AR40G. EDP acknowledges support from CONICET (PIP09-112-200801), ANPCYT (PICT08-1874), U. Nac. del Sur (24F044) and IAI grant CRN2076. The IAI is supported by the US NSF, grant GEO-045325.
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