Semidiurnal Baroclinic Tides on the Central Oregon Inner Shelf Public Deposited

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  • Semidiurnal velocity and density oscillations are examined over the mid- and inner continental shelf near Heceta Bank on the Oregon coast. Measurements from two long-term observation networks with sites on and off the submarine bank reveal that both baroclinic velocities and displacements are dominated by the first mode, with larger velocities on the midshelf and northern parts of the bank. Midshelf sites have current ellipses that are near the theoretical value for single, progressive internal tidal waves compared to more linearly polarized currents over the inner shelf. Baroclinic current variability is not correlated to the spring-neap cycle and is uncorrelated between mooring locations. An idealized model of two internal waves propagating from different directions reproduces some of the observed variability in semidiurnal ellipse parameters. At times, the phasing between moorings along a cross-shelf transect are consistent with onshelf wave propagation, a characteristic also present in the output of a three-dimensional regional circulation model. Regional wind-driven upwelling/downwelling influences stratification at all shelf moorings. At locations north of the bank, stronger baroclinic velocities were found during periods of higher background stratification.
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  • Suanda, S. H., & Barth, J. A. (2015). Semidiurnal Baroclinic Tides on the Central Oregon Inner Shelf. Journal of Physical Oceanography, 45(10), 2640-2659. doi:10.1175/JPO-D-14-0198.1
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  • 45
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  • 10
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  • This manuscript was funded with support from the David and Lucile Packard Foundation and the Gordon and Betty Moore Foundation (GBMF). Kate Adams provided MI_LOCO data (GBMF Grant 1661). This project was supported under the National Science Foundation Grants OCE-1155863 and OCE-0961999.
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