Upwelling rebound, ephemeral secondary pycnoclines, and the creation of a near-bottom wave guide over the Monterey Bay continental shelf
Author
Cheriton, Olivia M.
McPhee-Shaw, Erika E.
Storlazzi, Curt D.
Rosenberger, Kurt J.
Shaw, William J.
Raanan, Ben Y.
Date
2014Metadata
Show full item recordAbstract
Several 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
20m of the bottom, had amplitudes of 8–24 m, periods of 6–45 min, and depth-integrated energy fluxes up
to 200Wm 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.
Description
The article of record as published may be found at http://dx.doi.org/10.1002/2014GL061897
The USGS
data sets presented herein can be
obtained by sending a written request
to the corresponding author.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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