陈晓东,王安良,Knut HØyland,季顺迎.海冰盐度影响下冰水热力过程的试验研究[J].海洋通报,2019,(1):38-46
海冰盐度影响下冰水热力过程的试验研究
Study of the influence of sea ice salinity on the thermodynamics
投稿时间:2018-03-04  修订日期:2018-04-09
DOI:10.11840/j.issn.1001-6392.2019.01.006
中文关键词:  海冰  热物性质  热传导  相变  模型试验
英文关键词:sea ice  thermal property  heat conduction  phase change  model test
基金项目:国家重点研发计划 (2017YFE0111400;2016YCF1401505;2016YFC1402706);国家自然科学基金 (41506109;51639004)
作者单位E-mail
陈晓东 大连理工大学 工业装备结构分析国家重点实验室辽宁 大连 116023 chenxiaodong@mail.dlut.edu.cn 
王安良 国家海洋环境预报中心 国家海洋局海洋灾害预报技术研究重点实验室北京 100081  
Knut HØyland 挪威科技大学 SAMCoT 研究中心挪威 特隆赫姆 7491  
季顺迎 大连理工大学 工业装备结构分析国家重点实验室辽宁 大连 116023 jisy@dlut.edu.cn 
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中文摘要:
      北极多年海冰的渡夏与冰脊形成的初始阶段均属于海冰升温的热力学过程。在卤水作用下,海冰在升温过程中需要融化内部的固态冰以达到温盐平衡。为研究海冰升温过程中盐度对宏观热力学性质的影响,本文设计了冰块试样在水中的一维浸没试验。将具有相同初始温度 (-32℃)、不同盐度 (0 ppt, 2.65 ppt, 12 ppt) 的冰试样浸至 0.2 ℃的淡水环境中,并测试试样内部温度场与厚度变化。试验结果表明,高盐度海冰的最终冰厚增加量超过 31%,而淡水冰则仅为 15%。海冰内部卤水的活跃改变了海冰的宏观比热并大幅度提高了其潜在的内能变化量。同时,将内能变化的实测结果与 Schwerdfeger 模型理论计算结果进行了对比。分析得出,真实环境中在海冰卤水迁移引起的盐度不均匀分布与卤水外排使得 Schwerdfeger 模型无法准确描述海冰升温过程中热力学性质。此外,通过对新生冰进行冰晶测试中所观测的柱状结构及晶粒尺寸特征也进一步验证了试验结果的可靠性。
英文摘要:
      The warming-up process of sea ice widely exists in summer ice and the initial phase of ice ridge consolidation.Due to the brine migration, the internal pure ice is melted to maintain the salinity -temperature equilibrium. To study the influences of salinity on the thermal properties, one -dimensional submerging experiments were designed to put the ice sample into the salty water. A group of ice samples with the same initial temperature (-32℃) and various salinities (0ppt, 2.65ppt, 12ppt) were submerged into water with 0.2℃ . During each test, the ice growth and temperature profile were measured simultaneously. From the result, it shows that the ice growth of 12ppt sample is more than 31% while the fresh ice sample has grown around 15%. The brine action increases the specific heat of saline ice and boosts the potential of inertial energy. Meanwhile, a comparison is done between measurements and calculation from Schwerdfeger model. It is shown that Schwerdfeger model does not predict the thermal process properly due to the brine migration induced inhomogeneous distribution and salt drainage. Besides, the ice texture from thin section shows that the experiments are performed well along one dimension.
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