Oceanography The Official Magazine of
The Oceanography Society
Volume 21 Issue 04

View Issue TOC
Volume 21, No. 4
Pages 148 - 161

Dispersal of the Hudson River Plume in the New York Bight: Synthesis of Observational and Numerical Studies During LaTTE

Robert J. Chant John WilkinWeifeng ZhangByoung-Ju Choi Eli HunterRenato CastelaoScott Glenn Joe Jurisa Oscar SchofieldRobert HoughtonJosh KohutThomas K. Frazer Mark A. Moline
Article Abstract

Observations and modeling during the Lagrangian Transport and Transformation Experiment (LaTTE) characterized the variability of the Hudson River discharge and identified several freshwater transport pathways that lead to cross-shelf mixing of the Hudson plume. The plume’s variability is comprised of several different outflow configurations that are related to wind forcing, river discharge, and shelf circulation. The modes are characterized by coastal current formation and unsteady bulge recirculation. Coastal currents are favored during low-discharge conditions and downwelling winds, and represent a rapid downshelf transport pathway. Bulge formation is favored during high-discharge conditions and upwelling winds. The bulge is characterized by clockwise rotating fluid and results in freshwater transport that is to the left of the outflow and opposed to classical coastal current theory. Upwelling winds augment this eastward flow and rapidly drive the freshwater along the Long Island coast. Upwelling winds also favor a midshelf transport pathway that advects fluid from the bulge region rapidly across the shelf on the inshore side of the Hudson Shelf Valley. A clockwise bulgelike recirculation also occurs along the New Jersey coast, to the south of the river mouth, and is characterized by an offshore veering of the coastal current. Modeling results indicate that the coastal transport pathways dominate during the winter months while the midshelf transport pathway dominates during summer months. Finally, because the time scales of biogeochemical transformations in the plume range from hours to weeks or longer, the details of both the near- and far-field plume dynamics play a central role in the fate of material transported from terrestrial to marine ecosystems.

Citation

Chant, R.J., J. Wilkin, W. Zhang, B.-J. Choi, E. Hunter, R. Castelao, S. Glenn, J. Jurisa, O. Schofield, R. Houghton, J. Kohut, T.K. Frazer, and M.A. Moline. 2008. Dispersal of the Hudson River plume in the New York Bight: Synthesis of observational and numerical studies during LaTTE. Oceanography 21(4):148–161, https://doi.org/10.5670/oceanog.2008.11.

References

Editor’s Note: Oceanography does not usually permit citation of articles that are in review; however, because of the rapidly advancing nature of this issue’s topics, we are making an exception. Updates on the status of manuscripts cited as in review here will be posted on the CoOP Web site (http://www.skio.usg.edu/coop).

Avicola, G., and P. Huq. 2003. The characteristics of recirculating bulge region in coastal buoyant outflows. Journal of Marine Research 61:435–463.

Biscaye, P.E., C.N Flagg, and P.G. Falkowski. 1994. The Shelf Edge Exchange Processes experiment, SEEP-II: An introduction to hypotheses, results and conclusions. Deep Sea Research Part II 41:231–252, doi:10.1016/0967-0645(94)90022-1.

Bumpus, D.F. 1973. A description of the circulation on the continental shelf of the east coast of the United States. Progress in Oceanography 6:111–157.

Cahill, B., O. Schofield, R. Chant, J. Wilkin, E. Hunter, S. Glenn, and P. Bissett. 2008. Dynamics of turbid buoyant plumes and the feedbacks on near-shore biogeochemistry and physics. Geophysical Research Letters 35(L10605), doi:10.1029/2008GL033595.

Castelao, R., O. Schofield, R.J. Chant, and J. Kohut. 2008a. Cross-shelf transport of freshwater on the New Jersey Shelf. Journal of Geophysical Research 113(C07017), doi:10.1029/2007JC004241.

Castelao, R., O. Schofield, S. Glenn, R. Chant, J. Wilkin, and J. Kohut. 2008b. Seasonal evolution of hydrographic fields in the Central Middle Atlantic Bight. Geophysical Research Letters 35(L03617), doi:10.1029/2007GL032335.

Chant, R.J., S.M. Glenn, E. Hunter, J. Kohut, R.F. Chen, R. Houghton, J. Bosch, and O.M. Schofield. 2008. Bulge formation of a buoyant river outflow. Journal of Geophysical Research 113(C01017), doi:10.1029/2007JC004100.

Choi, B.J., and J.L. Wilkin. 2007. The effect of wind on the dispersal of the Hudson River Plume. Journal of Physical Oceanography 37:1,878–1,888.

Fong, D.A., and W.R. Geyer. 2001. Response of a river plume during an upwelling favorable wind event. Journal of Geophysical Research 106:1,067–1,084.

Fong, D.A., and W.R. Geyer. 2002. The alongshore transport of freshwater in a surface-trapped river plume. Journal of Physical Oceanography 32:957–972.

Garvine, R. 1987. Estuary plumes and fronts in shelf waters: A layer model. Journal of Physical Oceanography 17:1,877–1,896.

Garvine, R. 1999. Penetration of buoyant coastal discharge onto the continental shelf: A numerical model experiment. Journal of Physical Oceanography 29:1,892–1,909.

Garvine, R.W., and M.M. Whitney. 2006. An estuarine box model of freshwater delivery to the coastal ocean for use in climate models. Journal Of Marine Research 64:173–194.

Harris, C.K., B. Butman, and P. Traykovski. 2003. Winter-time circulation and sediment transport in the Hudson Shelf Valley. Continental Shelf Research 23:801–820.

Horner-Devine, A.R., D.A. Fong, S.G. Monismith, and T. Maxworthy. 2006. Laboratory experiments simulating a coastal river outflow. Journal of Fluid Mechanics 555:203–232.

Houghton, R.W., C.E. Tilburg, R.W. Garvine, and A. Fong. 2004. Delaware River plume response to a strong upwelling-favorable wind event. Geophysical Research Letters 31(L07302), doi:10.1029/2003GL018988.

Houghton, R.W., R.J. Chant, A. Rice, and C. Tilburg. In review. Salt flux into coastal river plumes: Dye studies in the Delaware and Hudson River outflows.

Lentz, S.J. 2008. Observations of the mean circulation over the middle Atlantic Bight continental shelf. Journal of Physical Oceanography 38:1,486–1,500.

Lerczak, J., W.R. Geyer, and R.J. Chant. 2006. Mechanisms driving the time-dependent salt flux in partially stratified estuary. Journal of Physical Oceanography 36(12):2,283–2,298.

Mountain, D. 2003. Variability in the properties of shelf water in the Middle Atlantic Bight 1977–1999. Journal of Geophysical Research 108(C1), 3014, doi:10.1029/2001JC001044.

Nof, D. 1988. Eddy-wall interactions. Journal of Marine Research 46:527–555.

Rennie, S.E., and S. Lentz. 1999. Observations of a pulsed buoyancy current downstream of Chesapeake Bay. Journal of Geophysical Research 104:18,228–18,240.

Ullman, D., and P. Cornillon. 1999. Satellite-derived sea surface temperature fronts on the continental shelf off the northeast US coast. Journal of Geophysical Research 104(C10):23,459–23,478.

Whitney, M.M., and R.W. Garvine. 2005. Wind influences on a coastal buoyant outflow. Journal of Geophysical Research 110(C0314), doi:10.1029/2003JC002261.

Yankovsky, A., and D.C. Chapman. 1997. A simple theory for the fate of buoyant coastal discharges. Journal of Physical Oceanography 27:1,386–1,401.

Yankovsky, A., and R.W. Garvine. 1998. Subinertial dynamics on the inner New Jersey Shelf during the upwelling season. Journal of Physical Oceanography 28:2,444–2,458.

Yankovsky, A.E., B.M. Hickey, and A.K. Munchow. 2004. The cyclonic turning and propagation of buoyant coastal discharge along the shelf. Journal of Marine Research 33:1,954–1,966.

Zhang, G., J. Wilkin, and R.J. Chant. In review–a. Modeling mean dynamics and freshwater pathways in the New York Bight.

Zhang, W.G., J.L. Wilkin, J.C. Levin, and H.G. Arango. In review–b. An adjoint sensitivity study of buoyancy and wind-driven circulation on the New Jersey inner shelf.