Decomposition of estuarine circulation and residual stratification under land-fast sea ice ...

• Main Authors: Burchard, Hans, Bolding, Karsten, Lange, Xaver, Osadchiev, Alexander
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Arctic; Sea ice
• Online Access: https://dx.doi.org/10.57757/iugg23-0300; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016154

<!--!introduction!--> For Arctic estuaries which are characterized by land-fast sea-ice cover during the winter season, processes generating estuarine circulation and residual stratification have not yet been investigated, although some of the largest estuaries in the world belong to this class. Land-fast sea ice provides a no-slip surface boundary condition in addition to the bottom boundary, such that frictional effects are expected to be increased. For this study of estuarine circulation and residual stratification under land-fast sea ice, first a simple linear analytical model is used. To include tidally varying scenarios, a water-column model is applied with a second-moment turbulence closure to juxtapose free-surface and ice-covered estuaries. Well-mixed and strongly stratified tidally periodic scenarios are analyzed by means of a decomposition of estuarine circulation into contributions from gravitational circulation, eddy viscosity - shear covariance (ESCO), surface stress and river run-off. A ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...