A mesoscopic numerical study of sea ice crystal growth and texture development

Kawano, Yoshiki; Ohashi, Tetsuya

doi:10.1016/j.coldregions.2009.02.001

Cited by 21 publications

(13 citation statements)

References 17 publications

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“…The model does not reproduce the morphological instability of an advancing columnar interface. This has been the focus of studies by Kawano and Ohashi [2008, 2009].…”

Section: Numerical Simulationmentioning

confidence: 99%

Observation and modeling of platelet ice fabric in McMurdo Sound, Antarctica

et al. 2010

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[1] During the annual growth of landfast ice in McMurdo Sound, Antarctica, an episodic flux of platelet ice crystals from the ocean contributes to the build up of a porous subice platelet layer, which is steadily incorporated into the sea ice cover as it thickens over winter. In November 2007, we examined the spatial variability of these processes by collecting sea ice cores, with simultaneous oceanographic observations, along an east-west transect in the sound. Previously identified draped and bladed platelet ice types were observed. In addition, we identify resumed columnar growth which appears to be a result of geometric selection from the subice platelet layer after the arrival of new platelet crystals from the ocean has ceased. A numerical model of mechanical platelet ice processes is developed that predicts crystal texture and c axis distributions, producing virtual incorporated platelet ice with known growth history. This model demonstrates how a disordered subice platelet layer arises from an initially flat interface and suggests that such a layer is more likely to form later in the growth season. The model also suggests how the grain boundary density in incorporated platelet ice responds to changes in the flux of loose platelet crystals from the ocean. Application of this result to our 2007 platelet ice observations indicates that sea ice in western McMurdo Sound is subject to larger and more persistent platelet fluxes than the ice in the east. This is consistent with the pattern of in situ supercooling just beneath the ocean surface.

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“…The model does not reproduce the morphological instability of an advancing columnar interface. This has been the focus of studies by Kawano and Ohashi [2008, 2009].…”

Section: Numerical Simulationmentioning

confidence: 99%

Observation and modeling of platelet ice fabric in McMurdo Sound, Antarctica

et al. 2010

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“…9). Kawano and Ohashi (2009) and Dempsey et al (2010) also successfully reproduced the phenomenon using the Voronoi dynamics technique. In the c-axis distributions near the sea surfaces, however, there was a little difference between the results obtained with and without considering the effects of flotation and accumulation of crystal nuclei.…”

Section: Development Process Of Sea Ice Crystals Simulated By the Vormentioning

confidence: 66%

“…The method was adapted to the three-dimensional simulations of crystal growth by Kawano and Ohashi (2009), and development process of sea ice from the sea surface was simulated; the results obtained by the simulations showed that the c-axis orientations as well as crystal fabrics have good similarity with those of actual sea ice. Dempsey et al (2010) introduced the effect of rotations of crystals after their flotation into the Voronoi dynamics technique; the model successfully predicted the platelet ice fabric in McMurdo Sound, Antarctica.…”

Section: Voronoi Dynamics Techniquementioning

confidence: 98%

“…We employ the Voronoi dynamics technique (Dempsey et al, 2010;Kawano and Ohashi, 2009;Ohashi et al, 2004) to simulate crystal growth of sea ice in three-dimensional space. In the technique, crystal growth is that in which each of crystal nuclei extends its territory.…”

Section: Voronoi Dynamics Techniquementioning

confidence: 99%

“…A reason for this is that the diameter of grains in this layer is usually b 5 mm and such fine grains are tedious to investigate using traditional experimental methods in glaciology (Weeks and Wettlaufer, 1996). Kawano and Ohashi (2009) have conducted numerical simulations of the development of the crystal fabric of sea ice using the Voronoi dynamics technique (Ohashi et al, 2004). In the model, the development of the crystal fabric was represented by the growth of crystal nuclei that had an anisotropic growth rate, and alignment of c-axes within the horizontal plane by geometric selection was obtained.…”

Section: Introductionmentioning

confidence: 99%

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