NUMERICAL SIMULATIONS OF FRAZIL ICE DYNAMICS IN THE UPPER LAYERS OF THE OCEAN

Citation
U. Svensson et A. Omstedt, NUMERICAL SIMULATIONS OF FRAZIL ICE DYNAMICS IN THE UPPER LAYERS OF THE OCEAN, Cold regions science and technology, 28(1), 1998, pp. 29-44
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary",Engineering,"Environmental Sciences
Journal title
ISSN journal
0165-232X
Volume
28
Issue
1
Year of publication
1998
Pages
29 - 44
Database
ISI
SICI code
0165-232X(1998)28:1<29:NSOFID>2.0.ZU;2-A
Abstract
The frazil ice dynamics in a turbulent Ekman layer have been investiga ted using a mathematical model. The model is based on the conservation equations for mean momentum, energy and salinity, and employs a two-e quation turbulence model for the determination of turbulent diffusion coefficients. A crystal number continuity equation is used for the pre diction of the frazil ice dynamics. This equation considers several pr ocesses of importance, as for example turbulent diffusion, gravitation al up-drift, flocculation/break-up and growth. The results focus on th e frazil ice characteristics in the upper layers of the ocean, like su spended ice volume, ice crystals per m(3), vertical distributions, etc . From the idealized calculations, it is indicated that a large number of ice crystals can be mixed into the ocean during freezing. However, the amount of ice in suspension, measured as vertically integrated ic e thickness, adds only a minor part to the total surface ice budget. S mall crystals are mixed deep in the ocean while the large ones are fou nd only in the top of the mixed layer. Knowledge about the vertical di stribution of ice crystals of different sizes, which is calculated fro m the model, should be of importance when analysing processes as forma tion of ice covers in the ocean and ice-sediment or ice-algae interact ion. (C) 1998 Elsevier Science B.V. All rights reserved.