Upwelling rebound, ephemeral secondary pycnoclines, and the creation of a near-bottom wave guide over the Monterey Bay continental shelf
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Abstract
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 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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Upwelling rebound, ephemeral secondary pycnoclines, and the creation of a near-bottom wave guide over the Monterey Bay continental shelf |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2014GL061897 |
| Volume | 41 |
| Issue | 23 |
| Year Published | 2014 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Pacific Coastal and Marine Science Center |
| Description | 9 p. |
| First page | 8503 |
| Last page | 8511 |
| Country | United States |
| State | California |
| Other Geospatial | Monterey Bay |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |