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4 - Buoyant coastal currents

Published online by Cambridge University Press:  05 April 2012

Steve Lentz
Affiliation:
University of Cambridge
Eric P. Chassignet
Affiliation:
Florida State University
Claudia Cenedese
Affiliation:
Woods Hole Oceanographic Institution, Massachusetts
Jacques Verron
Affiliation:
Centre National de la Recherche Scientifique (CNRS), Grenoble
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Summary

Introduction

Relatively fresh river or estuarine water entering the coastal ocean forms a buoyant plume that often turns anticyclonically (to the right in the Northern Hemisphere) and forms a buoyant gravity current that can flow large distances along the coast before dispersing (e.g., Mork 1981; Munchow and Garvine 1993a; Rennie et al. 1999; Royer 1981). The tendency for the buoyant water to turn and flow along the coast as a relatively narrow current is a consequence of Earth's rotation. The focus here is on two aspects relevant to buoyant gravity currents in the ocean: (1) determining the characteristics of buoyant coastal currents flowing along a sloping bottom and (2) determining the influence of wind forcing on buoyant coastal currents.

Buoyant coastal currents are important components of the circulation on most continental shelves (e.g., Simpson 1982; Hill 1998). Buoyant coastal currents also transport constituents, such as sediment, marine organisms, nutrients, and chemical pollutants large distances from their river or estuarine sources. Therefore, determining the ultimate distribution and fate of these constituents depends on understanding buoyant coastal currents and their alongshore range of influence (e.g.,Wiseman et al. 1997; Epifanio et al. 1989). Two examples of societal problems where buoyant coastal currents play an important role are hypoxia and abrupt climate change.

Hypoxia is dissolved oxygen concentrations that are reduced to a level that is detrimental to marine organisms. Hypoxia associated with nutrient transport from rivers to the coastal ocean is a global problem (Diaz 2001).

Type
Chapter
Information
Buoyancy-Driven Flows , pp. 164 - 202
Publisher: Cambridge University Press
Print publication year: 2012

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References

Alley, R. B., et al., 1997: Holocene climatic instability: A prominent, widespread event 8200 yr ago. Geology 25, 483–486.Google Scholar
Barber, D. C., et al., 1999: Forcing of the cold event of 8, 200 years ago by catastrophic drainage of Laurentide lakes. Nature 400, 344–348.Google Scholar
Blanton, J. O., L.-Y., Oey, J., Amft, and T. N., Lee, 1989: Advection of momentum and buoyancy in a coastal frontal zone. J. Phys. Oceanogr. 19, 98–115.Google Scholar
Boicourt, W. C., 1973: The circulation of water on the continental shelf from Chesapeake Bay to Cape Hatteras. Ph.D. thesis. The Johns Hopkins University.
Chao, S. Y., 1988: Wind-driven motion of estuarine plumes. J. Phys. Oceanogr. 18, 1144–1166.Google Scholar
Chapman, D. C., and S. J., Lentz, 1994: Trapping of a coastal density front by the bottom boundary layer. J. Phys. Oceanogr. 24, 1464–1479.Google Scholar
Choi, B.-J., and J. L., Wilkin, 2007: The effect of wind on the dispersal of the Hudson River plume. J. Phys. Oceanogr. 37, 1878–1897.Google Scholar
Clarke, G., D., Leverington, J., Teller, and A., Dyke, 2003: Superlakes, megafloods, and abrupt climate change. Science 301, 922–923.Google Scholar
Cochrane, J. D., and F. J., Kelly, 1986: Low-frequency circulation on the Texas-Louisiana continental shelf. J. Geophys. Res. 91, 10645–10659.Google Scholar
Diaz, R. J., 2001: Overview of hypoxia around the world. J. Env. Quality 30, 275–281.Google Scholar
Donato, T. F., and G. O., Marmorino, 2002: The surface morphology of a coastal gravity current. Cont. Shelf Res. 22, 131–146.Google Scholar
Epifanio, C. E., A. K., Masse, and R.W., Garvine, 1989: Transport of blue crab larvae by surface currents off Delaware Bay, USA. Marine Ecology Prog. Series 54, 35–41.Google Scholar
Fong, D. A., and W. R., Geyer, 2001: Response of a river plume during an upwelling favorable wind event. J. Geophys. Res. 106, 1067–1084.Google Scholar
Fong, D. A., W. R., Geyer, and R. P., Signell, 1997: The wind-forced response of a buoyant coastal current: Observations of the western Gulf of Maine plume. J. Mar. Syst. 12, 69–81.Google Scholar
Garvine, R.W., 1999: Penetration of buoyant coastal discharge onto the continental shelf: A numerical model experiment. J. Phys. Oceanogr. 29, 1892–1909.Google Scholar
Griffiths, R.W., 1986: Gravity currents in rotating systems. Annu. Rev. Fluid Mech. 18, 59–89.Google Scholar
Griffiths, R.W., and E. J., Hopfinger, 1983: Gravity currents moving along a lateral boundary in a rotating frame. J. Fluid Mech. 134, 357–399.Google Scholar
Hallock, Z. R., and G. O., Marmorino, 2002: Observations of the response of a buoyant estuarine plume to upwelling favorable winds. J. Geophys. Res. 107, 3066, doi:10.1029/2000JC000698.Google Scholar
Helfrich, K. R., A. C., Kuo, and L. J., Pratt, 1999: Nonlinear Ross by adjustment in a channel. J. Fluid Mech. 390, 187–222.Google Scholar
Hill, A. E., 1998: Buoyancy effects in coastal and shelf sea. K. H., Brink and A. R., Robinson (eds.) The Sea, Vol. 10, JohnWiley & Sons. pp 21–62.Google Scholar
Hsueh, Y., and B., Cushman-Roisin, 1983: On the formation of surface to bottom fronts over steep topography. J. Geophys. Res. 88, 743–750.Google Scholar
Johnson, D. R., A., Weidemann, R., Arnone, and C. O., Davis, 2001: Chesapeake Bay outflow plume and coastal upwelling events: Physical and optical properties. J. Geophys. Res. 106, 11613–11622.Google Scholar
Kourafalou, V. H., L.-Y., Oey, J. D., Wang, and T. N., Lee, 1996: The fate of river discharge on the continental shelf, 1, Modeling the river plume and the inner shelf coastal current. J. Geophys. Res. 101(C2), 3415–3434.Google Scholar
Kubokawa, A., and K., Hanawa, 1984: A theory of semigeostrophic gravity waves and its application to the intrusion of a density current along a coast. Part 2. Intrusion of a density current along a coast in a rotating fluid. J. Oceanogr. Soc. Japan 40, 260–270.Google Scholar
Lentz, S. J., 2004: The response of buoyant coastal plumes to upwelling-favorable winds. J. Phys. Oceanogr. 34, 2458–2469.Google Scholar
Lentz, S. J., and K. R., Helfrich, 2002: Buoyant gravity currents along a sloping bottom in a rotating frame. J. Fluid Mech. 464, 251–278.Google Scholar
Lentz, S. J., and J., Largier, 2006: The influence of wind forcing on the Chesapeake Bay buoyant coastal current. J. Phys. Oceanogr. 36, 1305–1316.Google Scholar
Lentz, S. J., S., Elgar, and R. T., Guza, 2003: Observations of the flow field near the nose of a buoyant coastal current. J. Phys. Oceanogr. 33, 933–943.Google Scholar
Li, Y., D., Nowlin Jr., and R. O., Reid, 1997: Mean hydrographic fields and their interannual variability over the Texas-Louisiana continental shelf in spring, summer, and fall. J.Geophys. Res. 102, 1027–1049.Google Scholar
Manabe, S., and R. J., Stouffer, 1997: Coupled ocean-atmosphere model response to freshwater input: Comparison to Younger Dryas event. Paleoceanography 12, 321–336.Google Scholar
Melton, C., L., Washburn, and C., Gotschalk, 2009: Wind relaxations and poleward flow events in a coastal upwelling system on the central California current. J. Geophys. Res. 114, doi:10.1029/2009JC005397.Google Scholar
Mork, M., 1981: Circulation phenomena and frontal dynamics of the Norwegian coastal current. Philos. Trans. R. Soc. London Ser. A 302, 635–647.Google Scholar
Munchow, A., and R. W., Garvine, 1993a: Dynamical properties of a buoyancy-driven coastal current. J. Geophys. Res. 98, 20063–20077.Google Scholar
Munchow, A., and R. W., Garvine, 1993b: Buoyancy and wind forcing of a coastal current. J. Mar. Res. 51, 293–322.Google Scholar
Pollard, R. T., P. B., Rhines, and R. O. R. Y., Thompson, 1973: The deepening of the wing-mixed layer. Geophys. Fluid Dyn. 3, 381–404.Google Scholar
Rennie, S., J. L., Largier, and S. J., Lentz, 1999: Observations of low-salinity coastal current pulses downstream of Chesapeake Bay. J. Geophys. Res. 104, 18227–18240.Google Scholar
Renssen, H., H., Goosse, and T., Fichefet, 2002: Modeling the effect of freshwater pulses on the early Holocene climate: The influence of high-frequency climate variability. Paleoceanography 17, Art. No. 1020.Google Scholar
Royer, T. C., 1981: Baroclinic transport in the Gulf of Alaska: a fresh water driven coastal current. J. Mar. Res. 39, 251–266.Google Scholar
Seidov, D., and M., Maslin, 1999: North Atlantic deep water circulation collapse during Heinrich events. Geology 27, 23–26.Google Scholar
Simpson, J. E., 1982: Gravity currents in the laboratory, atmosphere, and ocean. Annu. Rev. Fluid Mech. 14, 213–234.Google Scholar
Stern, M. E., J. A., Whitehead, and B. L., Hua, 1982: The intrusion of the head of a gravity current along the coast of a rotating fluid. J. Fluid Mech. 123, 237–266.Google Scholar
Whitehead, J. A., and D. C., Chapman, 1986: Laboratory observations of a gravity current on a sloping bottom: The generation of shelf waves. J. Fluid Mech. 172, 373–399.Google Scholar
Wiseman, W. J., N. N., Rabelais, R. E., Turner, S. P., Dinnel, and A., MacNaughton, 1997: Seasonal and interannual variability with the Louisiana coastal current: Stratification and hypoxia. J. Mar. Syst. 12, 237–248.Google Scholar
Woodson, C. B., L., Washburn, J. A., Barth, D. J., Hoover, A. R., Kirincich, M. A., McManus, J. P., Ryan, and J., Tyburczy, 2009: Northern Monterey Bay upwelling shadow front: Observations of a coastally and surface-trapped buoyant plume. J. Geophys. Res. 114, doi:10.1029/2009JC005623.Google Scholar
Yankovsky, A. E., and D. C., Chapman, 1997: A simple theory for the fate of buoyant coastal discharges. J. Phys. Oceanogr. 27, 1386–1401.Google Scholar
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