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Mixing Efficiencies in Patchy Turbulence
Publisher: American Meteorological Society
Abstract: The efficiency of mixing in stably stratified systems where the turbulent mixing is confined to intermittent patches is investigated theoretically. It is possible to define two different flux Richardson numbers for mixing ...
Overturning and Dissipation Caused by Baroclinic Tidal Flow near the Sill of a Fjord Basin
Publisher: American Meteorological Society
Abstract: Dissipation time series and moored velocity and density time series on the inner slopes of the Gullmar Fjord sill showed that the internal tides generated at the sill radiated to the head of the fjord, were reflected, and ...
Dynamics of Rotating Shallow Gravity Currents Passing through a Channel. Part II: Analysis
Publisher: American Meteorological Society
Abstract: The physics of frictional control for channelized rotating gravity currents are analyzed using an extensive dataset including hydrographic, current, and microstructure measurements from the western Baltic Sea. Rotational ...
Dynamics of Rotating Shallow Gravity Currents Passing through a Channel. Part I: Observation of Transverse Structure
Publisher: American Meteorological Society
Abstract: A detailed dataset describing a quasi-stationary bottom gravity current, approximately 10 m thick and 10 km wide, passing through a channel-like constriction in the western Baltic Sea is presented. The data include full-depth, ...
The Internal Seiches in Gullmar Fjord. Part I: Dynamics
Publisher: American Meteorological Society
Abstract: Internal seiche motions with period 1?3 days in Gullmar Fjord are investigated based on mooring data with high vertical and time resolution. The period and structure of the internal seiches are well described by a simple ...
The Internal Seiches in Gullmar Fjord. Part II: Contribution to Basin Water Mixing
Publisher: American Meteorological Society
Abstract: The mixing in the basin water (the water below sill level) of Gullmar Fjord has been investigated with the main focus on the contribution from internal seiches. A companion paper reports evidence for dissipation of internal ...
Observations of Turbulence Caused by a Combination of Tides and Mean Baroclinic Flow over a Fjord Sill
Publisher: American Meteorological Society
Abstract: his study investigates the dissipation rates and flow conditions at the Dr?bak Sill in the Oslofjord. The area was transected 13 times with a free-falling microstructure shear probe during 4 days in June 2011. At the same ...
Gravity Current Dynamics and Entrainment—A Process Study Based on Observations in the Arkona Basin
Publisher: American Meteorological Society
Abstract: A 19-h time series of dissipation, stratification, and horizontal velocities has been obtained for a dense gravity current flowing into the Arkona Basin in the western Baltic Sea. The observations are compared with ...
Tidal energy loss, internal tide radiation, and local dissipation for two-layer tidal flow over a sill
Publisher: American Meteorological Society
Abstract: simple analytical model for tidal energy loss at fjord sills and its partitioning into local dissipation and radiated internal tides is presented. The analytical model builds on a two-layer assumption with quasi-steady ...
Entrainment in Shallow Rotating Gravity Currents: A Modeling Study
Publisher: American Meteorological Society
Abstract: The physics of shallow gravity currents passing through a rotating channel at subcritical Froude number is investigated here with a series of idealized numerical experiments. It is found that the combined effects of friction ...