Current patterns over the shelf and slope adjacent to the Gulf of the Farallones; executive summary

Noble, Marlene A.; Ramp, Steven R.; Kinoshita, K.L.

doi:10.3133/ofr92382

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…Perhaps there is more of a time lag response in the currents when there is a “relaxing” of the winds. Previous studies have shown a surface current time lag response to winds [ Kaplan et al , 2005; Noble et al , 1992]. Poor correlations could also be influenced by a veering of surface currents due to Ekman transport, inertial effects, wind stress curl, eddies or flow from the Bay.…”

Section: Discussionmentioning

confidence: 99%

“…This has provided an unprecedented spatial and temporal view of sea surface currents in this region. Previous studies have examined the complex surface currents in the Gulf of the Farallones using moored acoustic Doppler current profilers (ADCPs) and ship‐mounted ADCPs [ Noble et al , 1992; Steger et al , 1998, 2000] but these studies did not have the advantage of having a year of continuous hourly 3 km resolution data that is now available with HF radar.…”

Section: Introductionmentioning

confidence: 99%

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An analysis of HF radar measured surface currents to determine tidal, wind‐forced, and seasonal circulation in the Gulf of the Farallones, California, United States

2010

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[1] A complete year of hourly 3 km resolution high-frequency radar measured surface currents covering the Gulf of the Farallones were analyzed with the following three primary objectives: (1) describe the seasonal surface circulation, (2) identify tidal currents, and (3) determine the influence of wind forcing. Three predominant seasonal circulation regimes were identified: relaxation, storm, and upwelling. The relaxation period exhibited mean poleward flow over the slope, variable equatorward flow over the shelf, and cyclonic and anticyclonic eddies south of Pt. Reyes. The storm period mean flow was variable and exhibited evidence of coastally trapped buoyancy flow from the mouth of the San Francisco Bay. The upwelling period exhibited equatorward flow throughout the gulf with regions of intensified flow at the northern and southern regions over the slope. The tidal variance ranged from 4 to 60%, was highest around the mouth of the Bay, decreased past the shelf, and its spatial pattern reflected the combined influence of the K 1 and M 2 tidal current amplitudes. K 1 ellipses typically rotated clockwise throughout the gulf and decreased in amplitude past the shelf. M 2 ellipses were comparably more variable in orientation and magnitude. Harmonic "tidal" analyses of buoy wind data over 4 month time periods showed significant K 1 amplitudes which did not appear when the analysis was done for the entire year. This indicates that harmonic tidal analyses on surface currents are probably more effective at disassociating diurnal sea breeze driven currents when performed over long periods of time such as a year.Citation: Gough, M. K., N. Garfield, and E. McPhee-Shaw (2010), An analysis of HF radar measured surface currents to determine tidal, wind-forced, and seasonal circulation in the

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An analysis of HF radar measured surface currents to determine tidal, wind‐forced, and seasonal circulation in the Gulf of the Farallones, California, United States

2010

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show abstract

“…The Gulf of the Farallones is an area of unusually high plankton abundance and productivity due to the combined effects of seasonal upwelling, nutrient discharge from San Francisco Bay, and the Pt. Reyes upwelling jet (Noble et al 1992, KLI 1991, Barber and Smith 1981, Owen 1974 Pelagic fishes of the upper (epipelagic) part of the water column are commonly dominated by small planktivores such as Pacific herring, northern anchovy, Pacific sardine, Pacific saury, and juvenile rockfishes (SAIC 1992). The latter are known to be major prey for a number of predators, including chinook salmon (Chess et al 1988).…”

Section: -91mentioning

confidence: 99%

Contributors and acknowledgements

2013

International Migration Policies

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Variations in sediment texture on the northern Monterey Bay National Marine Sanctuary continental shelf

Edwards

2002

Marine Geology

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Current patterns over the shelf and slope adjacent to the Gulf of the Farallones; executive summary

Cited by 10 publications

References 34 publications

An analysis of HF radar measured surface currents to determine tidal, wind‐forced, and seasonal circulation in the Gulf of the Farallones, California, United States

An analysis of HF radar measured surface currents to determine tidal, wind‐forced, and seasonal circulation in the Gulf of the Farallones, California, United States

Contributors and acknowledgements

Variations in sediment texture on the northern Monterey Bay National Marine Sanctuary continental shelf

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