Upwelling rebound, ephemeral secondary pycnoclines, and the creation of a near-bottom wave guide over the Monterey Bay continental shelf

Cheriton, O. M., McPhee-Shaw, E. E., Storlazzi, C. D., Rosenberger, K. J., Shaw, W. J., & Raanan, B. Y. (2015). Upwelling rebound, ephemeral secondary pycnoclines, and the creation of a near-bottom wave guide over the Monterey Bay continental shelf. Geophysical Research Letters, 41(23), 8503-8511.
Metadata
TitleUpwelling rebound, ephemeral secondary pycnoclines, and the creation of a near-bottom wave guide over the Monterey Bay continental shelf
AuthorsO. Cheriton, E. McPhee-Shaw, C. Storlazzi, K. Rosenberger, W. Shaw, B. Raanan
AbstractSeveral sequential upwelling events were observed in fall 2012, using measurements from the outer half of the continental shelf in Monterey Bay, during which the infiltration of dense water onto the shelf created a secondary, near-bottom pycnocline. This deep pycnocline existed in concert with the near-surface pycnocline and enabled the propagation of near-bottom, cold, semidiurnal internal tidal bores, as well as energetic, high-frequency, nonlinear internal waves of elevation (IWOE). The IWOE occurred within 20 m of the bottom, had amplitudes of 8-24 m, periods of 6-45 min, and depth-integrated energy fluxes up to 200 W m-1. Iribarren numbers (<0.03) indicate that these IWOE were nonbreaking in this region of the shelf. These observations further demonstrate how regional upwelling dynamics and the resulting bulk, cross-margin hydrography is a first-order control on the ability of internal waves, at tidal and higher frequencies, to propagate through continental shelf waters.
JournalGeophysical Research Letters
Date2015
Volume41
Issue23
Start page8503
End page8511
Subjectscontinental shelf, internal waves of elevation, Monterey Bay, near-bed pycnocline, upwelling
NoteOceanography

Bookmark

Bookmarks: