Index Catalog // ScholarsArchive@OSU

The dynamics of pressure and form drag on a sloping headland: Internal waves versus eddies

Creator:: Warner, Sally J. and MacCready, Parker
Abstract:: Topographically generated eddies and internal waves have traditionally been studied separately even though bathymetry that creates both phenomena is abundant in coastal regions. Here a numerical model is used to understand the dynamics of eddy and wave generation as tidal currents flow past Three Tree Point, a 1 km long,...
Resource Type:: Article
Full Text:: : Internal waves versus eddies Warner, S. J., and P. MacCready (2014), The dynamics of pressure and form

Seasonal Cross-Shelf Flow Structure, Upwelling Relaxation, and the Alongshelf Pressure Gradient in the Northern California Current System

Creator:: McCabe, Ryan M., Hickey, Barbara M., Dever, Edward P., and MacCready, Parker
Abstract:: Moored observations are used to investigate the seasonal change in vertical structure of the cross-shelf circulation at a midshelf location in the northern California Current System. A streamwise–normal coordinate system is employed to eliminate meander- and eddy-induced biases in the cross-shelf flow that are unaccounted for with an alternative, commonly...
Resource Type:: Article
Full Text:: System McCabe, R. M., Hickey, B. M., Dever, E. P., & MacCready, P. (2015). Seasonal Cross-Shelf Flow

Measurement of Tidal Form Drag Using Seafloor Pressure Sensors

Creator:: Warner, Sally J., MacCready, Parker, Moum, James N., and Nash, Jonathan D.
Abstract:: As currents flow over rough topography, the pressure difference between the up-and downstream sides results in form drag-a force that opposes the flow. Measuring form drag is valuable because it can be used to estimate the loss of energy from currents as they interact with topography. An array of bottom...
Resource Type:: Article
Full Text:: Seafloor Pressure Sensors SALLY J. WARNER AND PARKER MACCREADY School of Oceanography, University of

Evaluation of a coastal ocean circulation model for the Columbia River plume in summer 2004

Creator:: Liu, Yonggang, MacCready, Parker, Hickey, Barbara M., Dever, Edward P., Kosro, P. Michael, 1951-, and Banas, Neil S.
Abstract:: Realistic hindcast of the Columbia River estuarine-plume-shelf circulation in summer 2004 using the Regional Ocean Modeling System nested within the Navy Coastal Ocean Model (NCOM) is quantitatively evaluated with an extensive set of observations. The model has about equal skill at tidal and subtidal properties. Tidal circulation and water properties...
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Full Text:: . Citation: Liu, Y., P. MacCready, B. M. Hickey, E. P. Dever, P. M. Kosro, and N. S. Banas (2009), Evaluation

Form Drag and Mixing Due to Tidal Flow past a Sharp Point

Creator:: Edwards, Kathleen A., MacCready, Parker, Moum, James N., Pawla, Geno, Klymak, Jody M., and Perlin, Alexander
Abstract:: Barotropic tidal currents flowing over rough topography may be slowed by two bottom boundary–related processes: tangential stress of the bottom boundary layer, which is generally well represented by a quadratic drag law, and normal stress from bottom pressure, known as form drag. Form drag is rarely estimated from oceanic observations...
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Full Text:: phoc_34_411.1297_1312.tp VOLUME 34 JUNE 2004J O U R N A L O F P H Y S I

River influences on shelf ecosystems: Introduction and synthesis

Creator:: Hickey, B. M., Kudela, R. M., Nash, Jonathan, Bruland, K. W., Peterson, W. T., MacCready, P., Lessard, E. J., Jay, D. A., Banas, N. S., Baptista, A. M., Dever, Edward P., Kosro, P. Michael, Kilcher, L. K., Homer-Devine, A. R., Zaron, E. D., McCabe, R. M., Peterson, J. O., Orton, P. M., Pan, J., and Lohan, M. C.
Abstract:: River Influences on Shelf Ecosystems (RISE) is the first comprehensive interdisciplinary study of the rates and dynamics governing the mixing of river and coastal waters in an eastern boundary current system, as well as the effects of the resultant plume on phytoplankton standing stocks, growth and grazing rates, and community...
Resource Type:: Article
Full Text:: . MacCready,1 E. J. Lessard,1 D. A. Jay,5 N. S. Banas,6 A. M. Baptista,7 E. P. Dever,3 P. M. Kosro,3 L. K

A Comparison of Bulk Estuarine Turnover Timescales to Particle Tracking Timescales Using a Model of the Yaquina Bay Estuary

Creator:: Lemagie, Emily P. and Lerczak, James A.
Abstract:: The ability to determine a bulk estuarine turnover timescale that is well defined under realistic conditions is in high demand for estuarine research and management. We compare how turnover timescales vary with tidal and river forcing from idealized forcing scenarios using a three-dimensional circulation model of the Yaquina Bay estuary...
Resource Type:: Article
Full Text:: Lemagie, E. P., & Lerczak, J. A. (2015). A comparison of bulk estuarine turnover timescales to particle

On Symmetric Instabilities in Oceanic Bottom Boundary Layers

Creator:: Allen, J. S. and Newberger, P. A.
Abstract:: Model studies of two-dimensional, time-dependent, wind-forced, stratified downwelling circulation on the continental shelf have shown that the near-bottom offshore flow can develop time- and space-dependent fluctuations involving spatially periodic separation and reattachment of the bottom boundary layer and accompanying recirculation cells. Based primarily on the observation that the potential vorticity...
Resource Type:: Article
Full Text:: AND P. A. NEWBERGER College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis

On the Upwelling of Downwelling Currents

Creator:: Matano, Ricardo P. and Palma, Elbio D.
Abstract:: The term “downwelling currents” refers to currents with a downslope mass flux in the bottom boundary layer. Examples are the Malvinas and Southland Currents in the Southern Hemisphere and the Oyashio in the Northern Hemisphere. Although many of these currents generate the same type of highly productive ecosystems that is...
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Full Text:: On the Upwelling of Downwelling Currents RICARDO P. MATANO

A springtime source of toxic Pseudo-nitzschia cells on razor clam beaches in the Pacific Northwest

Creator:: Hickey, Barbara M., Trainer, Vera L., Kosro, P. Michael, Adams, Nicolaus G., Connolly, Thomas P., Kachel, Nancy B., and Geier, Susan L.
Abstract:: Concentrations of domoic acid (DA) above the regulatory limit in Washington coast razor clams are usually higher on northern beaches from summer to fall. Recent field studies have confirmed that the primary source of toxic Pseudo-nitzschia (PN) cells in those seasons is a semi-retentive topographically trapped seasonal eddy located offshore...
Resource Type:: Article
Full Text:: . Hickey a,*, Vera L. Trainer b, P. Michael Kosro c, Nicolaus G. Adams b, Thomas P. Connolly d, Nancy B

Three interacting freshwater plumes in the northern California Current System

Creator:: Hickey, B., McGabe, R., Geier, S., Dever, Edward P., and Kachel, N.
Abstract:: The northern California Current System is impacted by two primary freshwater sources: the Strait of Juan de Fuca and the Columbia River. The Columbia is frequently bidirectional in summer, with branches both north and south of the river mouth simultaneously. We describe the interaction of these two warm Columbia plumes...
Resource Type:: Article
Full Text:: complex strait region [MacCready et al., 2008]. However, recent drifter studies have shown clearly that in

Intensified Diurnal Tides along the Oregon Coast

Creator:: Osborne, J. J., Kurapov, A. L., Egbert, G. D., and Kosro, P. M.
Abstract:: Intensified diurnal tides are found along portions of the Oregon shelf (U.S. West Coast) based on analyses of high-frequency (HF) radar surface current data and outputs of a 1-km resolution ocean circulation model. The K₁ tidal currents with magnitudes near 0.07 m s⁻¹ over a wider part of the shelf...
Resource Type:: Article
Full Text:: . Amer. Meteor. Soc., 89, 1877–1888, doi:10.1175/2008BAMS2528.1. McCabe, R. M., P. MacCready, and G

Influence of varying upper ocean stratification on coastal near-inertial currents

Creator:: Kim, Sung Yong, Kurapov, Alexander L., and Kosro, P. Michael
Abstract:: The influence of varying horizontal and vertical stratification in the upper layer ( inline image m) associated with riverine waters and seasonal atmospheric fluxes on coastal near-inertial currents is investigated with remotely sensed and in situ observations of surface and subsurface currents and realistic numerical model outputs off the coast...
Resource Type:: Article
Full Text:: stratification on coastal near-inertial currents Sung Yong Kim1, Alexander L. Kurapov2, and P. Michael Kosro2

Anomalous Near-Surface Low-Salinity Pulses off the Central Oregon Coast

Creator:: Mazzini, Piero L. F., Risien, Craig M., Barth, John A., Pierce, Stephen D., Erofeev, Anatoli, Dever, Edward P., Kosro, P. Michael, Levine, Murray D., Shearman, R. Kipp, and Vardaro, Michael F.
Abstract:: From mid-May to August 2011, extreme runoff in the Columbia River ranged from 14,000 to over 17,000 m³/s, more than two standard deviations above the mean for this period. The extreme runoff was the direct result of both melting of anomalously high snowpack and rainfall associated with the 2010–2011 La Niña....
Resource Type:: Article
Full Text:: ., MacCready, P. & Hickey, B. M. The Columbia River plume as along-shelf barrier and cross- shelf exporter: A

Multiple trophic levels fueled by recirculation in the Columbia River plume

Creator:: Kudela, Raphael M., Horner-Devine, Alexander R., Banas, Neil S., Hickey, Barbara M., Peterson, Tawnya D., McCabe, Ryan M., Lessard, Evelyn J., Frame, Elizabeth, Bruland, Kenneth W., Jay, David A., Peterson, Jay O., Peterson, William T., Kosro, P. Michael, Palacios, Sherry L., Lohan, Maeve C., and Dever, Edward P.
Abstract:: Large rivers represent gateways for the transport of terrigenous and anthropogenic material to the coastal ocean. Here we document a ∼700 km2 recirculation or bulge associated with the Columbia River plume that retains recently discharged river water sufficiently to create a regional bioreactor. Fueled by a fluvial nitrate source, this...
Resource Type:: Article
Full Text:: . Lett., 33, L22S06, doi:10.1029/2006GL026772. Liu, Y., P. MacCready, and B. M. Hickey (2009), Columbia

Convectively Driven Mixing in the Bottom Boundary Layer

Creator:: Moum, J. N., Perlin, A., Klymak, J. M., Levine, M. D., Boyd, Timothy John, 1958-2013, and Kosro, P. M.
Abstract:: Closely spaced vertical profiles through the bottom boundary layer over a sloping continental shelf during relaxation from coastal upwelling reveal structure that is consistent with convectively driven mixing. Parcels of fluid were observed adjacent to the bottom that were warm (by several millikelvin) relative to fluid immediately above. On average,...
Resource Type:: Article
Full Text:: thermal dissipation in a convecting surface boundary layer. J. Geophys. Res., 94, 6273–6284. MacCready, P

Infrastructure for collaborative science and societal applications in the Columbia River estuary

Creator:: Baptista, António M., Seaton, Charles, Wilkin, Michael P., Riseman, Sarah F., Needoba, Joseph A., Maier, David, Turner, Paul J., Kärnä, Tuomas, Lopez, Jesse E., Herfort, Lydie, Megler, V. M., McNeil, Craig, Crump, Byron C., Peterson, Tawnya D., Spitz, Yvette H., and Simon, Holly M.
Abstract:: To meet societal needs, modern estuarine science needs to be interdisciplinary and collaborative, combine discovery with hypotheses testing, and be responsive to issues facing both regional and global stakeholders. Such an approach is best conducted with the benefit of data-rich environments, where information from sensors and models is openly accessible...
Resource Type:: Article
Full Text:: P. WILKIN1,3, Sarah F. RISEMAN1,2, Joseph A. NEEDOBA1,2, David MAIER1,4, Paul J. TURNER1,2, Tuomas

The Temporal Response of the Length of a Partially Stratified Estuary to Changes in River Flow and Tidal Amplitude

Creator:: Lerczak, James A., Geyer, W. Rockwell, and Ralston, David K.
Abstract:: The temporal response of the length of a partially mixed estuary to changes in freshwater discharge Q𝒻 and tidal amplitude Uₜ is studied using a 108-day time series collected along the length of the Hudson River estuary in the spring and summer of 2004 and a long-term (13.4 yr) record...
Resource Type:: Article
Full Text:: scales over which the forc- ing varies (Kranenburg 1986; Hetland and Geyer 2004; MacCready 2007). If

Estuarine Exchange Flow Quantified with Isohaline Coordinates: Contrasting Long and Short Estuaries

Creator:: Chen, Shih-Nan, Geyer, W. Rockwell, Ralston, David K., and Lerczak, James A.
Abstract:: Isohaline coordinate analysis is used to compare the exchange flow in two contrasting estuaries, the long (with respect to tidal excursion) Hudson River and the short Merrimack River, using validated numerical models. The isohaline analysis averages fluxes in salinity space rather than in physical space, yielding the isohaline exchange flow...
Resource Type:: Article
Full Text:: with global salt budget is commonly noted in the literature (see review by MacCready and Geyer 2010

Subtidal Salinity and Velocity in the Hudson River Estuary: Observations and Modeling

Creator:: Ralston, David K., Geyer, W. Rockwell, and Lerczak, James A.
Abstract:: A tidally and cross-sectionally averaged model based on the temporal evolution of the quasi-steady Hansen and Rattray equations is applied to simulate the salinity distribution and vertical exchange flow along the Hudson River estuary. The model achieves high skill at hindcasting salinity and residual velocity variation during a 110-day period...
Resource Type:: Article
Full Text:: before the forcing changes (Kranen- berg 1986; MacCready 1999; Hetland and Geyer 2004; Banas et al. 2004

ScholarsArchive@OSU

The dynamics of pressure and form drag on a sloping headland: Internal waves versus eddies

Seasonal Cross-Shelf Flow Structure, Upwelling Relaxation, and the Alongshelf Pressure Gradient in the Northern California Current System

Measurement of Tidal Form Drag Using Seafloor Pressure Sensors

Evaluation of a coastal ocean circulation model for the Columbia River plume in summer 2004

Form Drag and Mixing Due to Tidal Flow past a Sharp Point

River influences on shelf ecosystems: Introduction and synthesis

A Comparison of Bulk Estuarine Turnover Timescales to Particle Tracking Timescales Using a Model of the Yaquina Bay Estuary

On Symmetric Instabilities in Oceanic Bottom Boundary Layers

On the Upwelling of Downwelling Currents

A springtime source of toxic Pseudo-nitzschia cells on razor clam beaches in the Pacific Northwest

Three interacting freshwater plumes in the northern California Current System

Intensified Diurnal Tides along the Oregon Coast

Influence of varying upper ocean stratification on coastal near-inertial currents

Anomalous Near-Surface Low-Salinity Pulses off the Central Oregon Coast

Multiple trophic levels fueled by recirculation in the Columbia River plume

Convectively Driven Mixing in the Bottom Boundary Layer

Infrastructure for collaborative science and societal applications in the Columbia River estuary

The Temporal Response of the Length of a Partially Stratified Estuary to Changes in River Flow and Tidal Amplitude

Estuarine Exchange Flow Quantified with Isohaline Coordinates: Contrasting Long and Short Estuaries

Subtidal Salinity and Velocity in the Hudson River Estuary: Observations and Modeling

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