| YAN Yu,GU Wei,XU Yingjun,LI Qian. 2019. The in situ observation of modelled sea ice drift characteristics in the Bohai Sea. Acta Oceanologica Sinica, 38(3):17－25 |
| The in situ observation of modelled sea ice drift characteristics in the Bohai Sea |
| 渤海模型冰运动特征的现场观测研究 |
| Received:January 05, 2018 |
| DOI：10.1007/s13131-019-1395-5 |
| Key words:Bohai Sea modelled ice in situ observation sea ice drift |
| 中文关键词: 渤海 模型冰 现场观测 海冰运动 |
| 基金项目:国家自然科学基金面上项目（41571510）；中央高校基本科研业务费专项资金资助项目（2014KJJCB02） |
| Author Name | Affiliation | E-mail | | YAN Yu | Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Faculty of Geographical Science, Beijing 100875, China
Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China | | | GU Wei | Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Faculty of Geographical Science, Beijing 100875, China
Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China | | | XU Yingjun | Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Faculty of Geographical Science, Beijing 100875, China
Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China | xyj@bnu.edu.cn | | LI Qian | Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Faculty of Geographical Science, Beijing 100875, China
Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| Sea ice drift is mainly controlled by ocean currents, local wind, and internal ice stress. Information on sea ice motion, especially in situ synchronous observation of an ice velocity, a current velocity, and a wind speed, is of great significance to identify ice drift characteristics. A sea ice substitute, the so-called "modelled ice", which is made by polypropylene material with a density similar to Bohai Sea ice, is used to complete a free drift experiment in the open sea. The trajectories of isolated modelled ice, currents and wind in the Bohai Sea during non-frozen and frozen periods are obtained. The results show that the currents play a major role while the wind plays a minor role in the free drift of isolated modelled ice when the wind is mild in the Bohai Sea. The modelled ice drift is significantly affected by the ocean current and wind based on the ice-current-wind relationship established by a multiple linear regression. The modelled ice velocity calculated by the multiple linear regression is close to that of the in situ observation, the magnitude of the error between the calculated and observed ice velocities is less than 12.05%, and the velocity direction error is less than 6.21°. Thus, the ice velocity can be estimated based on the observed current velocity and wind speed when the in situ observed ice velocity is missing. And the modelled ice of same thickness with a smaller density is more sensitive to the current velocity and the wind speed changes. In addition, the modelled ice drift characteristics are shown to be close to those of the real sea ice, which indicates that the modelled ice can be used as a good substitute of real ice for in situ observation of the free ice drift in the open sea, which helps solve time availability, safety and logistics problems related to in situ observation on real ice. |
| 中文摘要: |
| 海冰受海流、风和其他因素作用在海面上运动，海冰运动速度、流速、风速等多要素数据同步获取对研究渤海海冰运动特征有重要意义。本文选用密度与渤海海冰类似的聚丙烯材料模拟海冰进行开阔海域自由漂移实验，获得冰期与非冰期单一冰块运动轨迹、海流和风等同步观测数据。研究结果表明：单一模型冰在开阔海域做自由运动时，海流对其运动起主要作用，风对其运动起次要作用。海冰运动速度与流速、风速密切相关，所建立回归模型计算冰速与现场观测速度接近，计算冰速与实测冰速大小误差小于12.05%，速度方向误差小于6.21°。未来无现场观测冰速资料时，可通过流速和风速估算该海域冰速及其变化。与此同时，具有相同厚度而密度较小的模型冰对流速和风速的变化更为敏感。此外，模型冰运动轨迹和速度与相同尺度的真实冰十分接近，可用其代替真实冰在海上开展相关模拟实验。 |
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