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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2006.11
- 수록면
- 21 - 26 (6page)
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Platelet ice is an important component of Antarctic land-fast sea ice. It is typically found at ice depths greater than about one meter, near ice shelves. We consider a new mechanism, to explain why platelet ice is not found at shallower depths. We develop and solve analytically a simple model for the growth of the fast ice interface with the ocean, incorporating the turbulent exchange of heat and salt with the mixed layer in the ocean. The hypothesis is that brine rejected by the fast ice can generate turbulent stirring sufficient to prevent frazil ice from sticking to the interface, forcing it to remain in suspension until a critical fast ice thickness is reached. Then brine rejection slows down enough to allow frazil to settle and stick to the fast ice interface, providing multiple source crystals that seed platelet ice development. We find that the rate of brine ejection does slow significantly as fast ice grows thicker, and is of the right order of magnitude to explain the absence of platelet ice at shallow levels in fast ice. Our analytical model is then compared with models which consider only the of heat at the ice/water interface, ignoring the conservation of salt. We find that salt plays a vital role in the growth of fast ice.
목차
ABSTRACT
INTRODUCTION
MODELLING CONSIDERATIONS
NONDIMENSIONALISED MODEL FOR ZERO SHEAR FLOW
BRINE EXPULSION
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2009-410-014679060