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首页> 外文期刊>Annals of Glaciology >Comparison of different ridge formation models of Arctic sea ice with observations from laser profiling
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Comparison of different ridge formation models of Arctic sea ice with observations from laser profiling

机译:北极海冰不同脊形成模型的激光剖面观测结果比较

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摘要

Sea ice deforms under convergent and shear motion, causing rafting and ridging. This results in thicker ice than could be formed by thermodynamic growth only. Three different approaches to simulating the formation of pressure ridges in a dynamic–thermodynamic continuum model are considered. They are compared with and evaluated by airborne laser profiles of the sea-ice surface roughness. The respective characteristic of each of the three ridging schemes is (1) a prognostic equation for deformation energy from which ridge parameters are derived; (2) a redistribution function, shifting ice between two categories, level and ridged, combined with a Monte Carlo simulation for ridge parameters; and (3) prognostic equations for ridge density and height, resulting in the formation of ridged-ice volume. The model results show that the ridge density is typically related to the state of ice motion, whereas the mean sail height is related to the parent ice thickness. In general, all of the three models produce realistic distributions of ridges. Finally, the second ridging scheme is regarded as the most appropriate for climate modelling, while the third scheme has advantages in short-term sea-ice forecasting.
机译:海冰在会聚和剪切运动下变形,从而导致漂流和起伏。这导致比仅通过热力学生长可能形成的冰厚。考虑了三种不同的方法来模拟动态-热力学连续体模型中压力脊的形成。将它们与海冰表面粗糙度的机载激光轮廓进行比较并进行评估。三种起伏方案中每一种的各自特征是:(1)变形能的预测方程式,可从中推导出脊参数; (2)重新分配函数,在冰层和山脊两类之间移动冰,并结合蒙特卡罗模拟山脊参数; (3)脊密度和高度的预测方程,导致形成冰脊体积。模型结果表明,脊密度通常与冰运动状态有关,而平均帆高与母冰厚度有关。总的来说,所有这三个模型都会产生逼真的脊分布。最后,第二种起伏方案被认为是最适合气候模拟的方案,而第三种方案在短期海冰预报方面具有优势。

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