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- W4220765483 abstract "<p>River plumes can form where rivers discharge into the ocean and create transport and mixing pathways which ultimately blend freshwater with salty. Biogeochemical processes such as hypoxia, algal blooms, and primary productivity can be influenced by physical plume processes, making the topic important to study. Mixing, which we define as fluxes of buoyancy across isopycnals (vertical turbulent buoyancy flux, <em>B</em>), has historically been difficult to characterize in river plumes due to limited spatial and temporal resolution of measurements. Former work has generally focused on one plume region (i.e., the front, source, or nearfield) at a static point in time. In this presentation, we present novel CTD (conductivity, temperature, depth), turbulence, and current measurements in the tidally pulsed Merrimack River plume over an ebb tidal pulse (~7 hours) from plume source to front. Data was collected during calm conditions with negligible influence from wind and waves. Measurements allow for the quantification of <em>B</em> at multiple stations along three source-front transects, providing refined spatiotemporal mixing estimates in a tidal plume. Results indicate plume mixing is maximized (<em>B</em> ~ 10<sup>-4</sup>&#8211;10<sup>-5</sup> m<sup>2</sup>s<sup>-3</sup>) in the nearfield plume, just seaward of the mouth, over the entire ebb pulse. Mixing then generally decays approaching the plume front, where it then exhibits a local maximum (<em>B</em> ~ 10<sup>-5</sup>&#8211;10<sup>-6</sup> m<sup>2</sup>s<sup>-3</sup>) which is lesser in magnitude than the nearfield location but larger than in the transitional region between nearfield and front (<em>B</em> ~ 10<sup>-6</sup>&#8211;10<sup>-7</sup> m<sup>2</sup>s<sup>-3</sup>). Two mixing regimes are evident over the tidal pulse: interfacial mixing which entrains relatively salty, cold water from the ambient shelf into the plume layer, and plume-layer shear mixing which mixes different plume density classes but does not entrain ambient water into the plume. Interfacial mixing dominates everywhere in the plume during the initial ebb, jet-like discharge and throughout the tidal pulse in the nearfield. Plume-layer mixing develops near the time of maximum ebb discharge in the region between nearfield and front and sustains to the end of the tidal pulse. These observations are the first to characterize the development of mixing throughout the interior plume over a tidal pulse.</p>" @default.
- W4220765483 created "2022-04-03" @default.
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- W4220765483 date "2022-03-27" @default.
- W4220765483 modified "2023-09-26" @default.
- W4220765483 title "Source-to-front mixing in a tidally pulsed river plume: mechanisms and evolution" @default.
- W4220765483 doi "https://doi.org/10.5194/egusphere-egu22-5275" @default.
- W4220765483 hasPublicationYear "2022" @default.
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