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dc.contributor.authorWarner, John C.  Concept link
dc.contributor.authorGeyer, W. Rockwell  Concept link
dc.contributor.authorRalston, David K.  Concept link
dc.contributor.authorKalra, Tarandeep S.  Concept link
dc.date.accessioned2021-03-29T20:09:06Z
dc.date.available2021-03-29T20:09:06Z
dc.date.issued2020-11-12
dc.identifier.citationWarner, J. C., Geyer, W. R., Ralston, D. K., & Kalra, T. (2020). Using tracer variance decay to quantify variability of salinity mixing in the Hudson River Estuary. Journal of Geophysical Research: Oceans, 125(12), e2020JC016096.en_US
dc.identifier.urihttps://hdl.handle.net/1912/26884
dc.description© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Warner, J. C., Geyer, W. R., Ralston, D. K., & Kalra, T. Using tracer variance decay to quantify variability of salinity mixing in the Hudson River Estuary. Journal of Geophysical Research: Oceans, 125(12), (2020): e2020JC016096, https://doi.org/10.1029/2020JC016096.en_US
dc.description.abstractThe salinity structure in an estuary is controlled by time‐dependent mixing processes. However, the locations and temporal variability of where significant mixing occurs is not well‐understood. Here we utilize a tracer variance approach to demonstrate the spatial and temporal structure of salinity mixing in the Hudson River Estuary. We run a 4‐month hydrodynamic simulation of the tides, currents, and salinity that captures the spring‐neap tidal variability as well as wind‐driven and freshwater flow events. On a spring‐neap time scale, salinity variance dissipation (mixing) occurs predominantly during the transition from neap to spring tides. On a tidal time scale, 60% of the salinity variance dissipation occurs during ebb tides and 40% during flood tides. Spatially, mixing during ebbs occurs primarily where lateral bottom salinity fronts intersect the bed at the transition from the main channel to adjacent shoals. During ebbs, these lateral fronts form seaward of constrictions located at multiple locations along the estuary. During floods, mixing is generated by a shear layer elevated in the water column at the top of the mixed bottom boundary layer, where variations in the along channel density gradients locally enhance the baroclinic pressure gradient leading to stronger vertical shear and more mixing. For both ebb and flood, the mixing occurs at the location of overlap of strong vertical stratification and eddy diffusivity, not at the maximum of either of those quantities. This understanding lends a new insight to the spatial and time dependence of the estuarine salinity structure.en_US
dc.description.sponsorshipThis study was funded through the Coastal Model Applications and Field Measurements Project and the Cross‐shore and Inlets Project, US Geological Survey Coastal Marine Hazards and Resources Program. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government.en_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2020JC016096
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectHudson River Estuaryen_US
dc.subjectmixingen_US
dc.subjectnumerical modelingen_US
dc.subjecttracer varianceen_US
dc.titleUsing tracer variance decay to quantify variability of salinity mixing in the Hudson River Estuaryen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2020JC016096


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Attribution 4.0 International
Except where otherwise noted, this item's license is described as Attribution 4.0 International