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《Resources Science》 2010-03
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Distribution of Sea Ice Density and Air Porosity along the Coast of the Bohai Sea

LIN Yebin1,XU Yingjun1,GU Wei1,BU Danyang1,YUAN Shuai2,HUANG Shuqing1,SHI Peijun1 (1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China; 2. National Marine Environmental Monitoring Centre, Dalian 116023, China)  
Density is an important physical quantity of sea ice, generally ranging from 0.72g/cm3 to 0.94g/cm3. Sea ice density is affected by many factors such as temperature and salinity of sea water, type and age of sea ice, and measurement methods. Studying sea water density would provide useful information on characteristics and movement of sea ice. In the present work, the authors performed a study on sea ice density for the Bohai Sea in China. Sea ice samples were obtained from a series of monitoring sites around the Bohai Sea in 2008 and 2009, respectively. In order to maintain their properties, all of the samples were stored in a refrigerator bellow -15℃ before experiments. Sea ice density can basically be grouped into two categories: real density and apparent density. Kerosene density is close to the sea ice density. Due to being bounded by kerosene, sea ice is hard to thaw. To this end, kerosene was used as an auxiliary solvent to measure sea ice density. The method designed and utilized in the study can be considered as a new method for sea ice density measurement. By means of kerosene, the authors successfully determined the real density and apparent density of level ices and rubble ices. Results showed that the density of level ice was between 0.633g/cm3 to 0.918 g/cm3 while the rubble ice ranged from 0.615g/cm3 to 0.906g/cm3. Sea ice densities also vary over years and sites because of a variety of complex factors affecting them. However, it was found that the spatial distribution of sea ice density around the Bohai Bay and Liaodong Bay had certain similar characteristics based on a series of experimental processes and data analyses. For the same site, the density of level ice was larger than that of rubble ice, while there were no obvious differences between sea ice density of the Bohai Bay and Liaodong Bay. In addition, the authors put forward a concept of 'air porosity', which is calculated by real density and apparent density of sea ice. The magnitude of air porosity and density can reflect quality and quantity of Bohai sea ice to some degree, so the introduced concept and the ice density measurements would be useful for studies on spatial distribution of sea ice and benefit the utilization and development of Bohai sea ice resources in the future.
【Fund】: 国家“863”计划重点项目课题(编号:2006AA100206);; 国家科技支撑计划重大项目课题(编号:2006BAB03A03);; 国家自然科学基金项目(批准号:40801230 40335048);; 国家高技术产业化专项:“渤海海冰淡化关键设备研制及工程试验”
【CateGory Index】: P731.15
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