Introduction of parameterized sea ice drag coefficients into ice free-drift modeling

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• 作者：Peng Lu ; Zhijun Li ; Hongwei Han
• 关键词：sea ice ; drag coefficient ; parameterization ; free drift ; modeling
• 刊名：Acta Oceanologica Sinica
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：35
• 期：1
• 页码：53-59
• 全文大小：1,352 KB
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• 作者单位：Peng Lu (1)
  Zhijun Li (1)
  Hongwei Han (1)
  
  1. Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China
  
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

Many interesting characteristics of sea ice drift depend on the atmospheric drag coefficient (C _a) and oceanic drag coefficient (C _w). Parameterizations of drag coefficients rather than constant values provide us a way to look insight into the dependence of these characteristics on sea ice conditions. In the present study, the parameterized ice drag coefficients are included into a free-drift sea ice dynamic model, and the wind factor α and the deflection angle θ between sea ice drift and wind velocity as well as the ratio of C _a to C _w are studied to investigate their dependence on the impact factors such as local drag coefficients, floe and ridge geometry. The results reveal that in an idealized steady ocean, C _a/C _w increases obviously with the increasing ice concentration for small ice floes in the marginal ice zone, while it remains at a steady level (0.2–0.25) for large floes in the central ice zone. The wind factor α increases rapidly at first and approaches a steady level of 0.018 when A is greater than 20%. And the deflection angle θ drops rapidly from an initial value of approximate 80° and decreases slowly as A is greater than 20% without a steady level like α. The values of these parameters agree well with the previously reported observations in Arctic. The ridging intensity is an important parameter to determine the dominant contribution of the ratio of skin friction drag coefficient (Cs’/Cs) and the ratio of ridge form drag coefficient (C _r’/C _r) to the value of C _a/C _w, α, and θ, because of the dominance of ridge form drag for large ridging intensity and skin friction for small ridging intensity among the total drag forces. Parameterization of sea ice drag coefficients has the potential to be embedded into ice dynamic models to better account for the variability of sea ice in the transient Arctic Ocean. Key words sea ice drag coefficient parameterization free drift modeling