| LU Peng,LI Zhijun,ZHANG Zhanhai,DONG Xilu. 2005. Arctic sea ice distribution in summer based on aerial photos. Acta Oceanologica Sinica, (6):62－67 |
| Arctic sea ice distribution in summer based on aerial photos |
| Arctic sea ice distribution in summer based on aerial photos |
| Received:July 28, 2005 Revised:November 02, 2005 |
| DOI： |
| Key words:sea ice Arctic Ocean image processing fractals |
| 中文关键词: sea ice Arctic Ocean image processing fractals |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LU Peng | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China | xioshui@dl.cn | | LI Zhijun | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China | | | ZHANG Zhanhai | Polar Research Institute of China, Shanghai 200129, China | | | DONG Xilu | School of Electronics and Information Engineering, Dalian University of Technology, Dalian 116024, China | |
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| Abstract: |
| On the basis of aerial photos of sea ice in the Second Chinese National Arctic Research Expdition during July and September 2003 in the area of 74.11°~79.56°N and 144.17°~169.95°W, image processing techniques are used to acquire some geometric parameters of floes, such as fractal dimension, roundness and mean caliper diameter. Latitudinal variation of morphology of arctic ice floes is then obtained, after comparing fractal dimension and roundness which represent geometry of floe edge, the latter is found to show a more obvious tendency with latitude but still not enough to describe floe abrasion. Then mean caliper diameter of ice floe is used as charac-teristic size to analyze floe size distribution, the result reveals that cumulative probabilities of floe sizes agree well with a power-law function, and distribution dimension is generally in the range of 1.05~1.25 and slightly increases as the latitude increases. However slight curvatures are still observed in the plots of cumulative probabilities as in former researches, which can be attributed to both the limitation of sampling area and effect of thermodynamic process. |
| 中文摘要: |
| On the basis of aerial photos of sea ice in the Second Chinese National Arctic Research Expdition during July and September 2003 in the area of 74.11°~79.56°N and 144.17°~169.95°W, image processing techniques are used to acquire some geometric parameters of floes, such as fractal dimension, roundness and mean caliper diameter. Latitudinal variation of morphology of arctic ice floes is then obtained, after comparing fractal dimension and roundness which represent geometry of floe edge, the latter is found to show a more obvious tendency with latitude but still not enough to describe floe abrasion. Then mean caliper diameter of ice floe is used as charac-teristic size to analyze floe size distribution, the result reveals that cumulative probabilities of floe sizes agree well with a power-law function, and distribution dimension is generally in the range of 1.05~1.25 and slightly increases as the latitude increases. However slight curvatures are still observed in the plots of cumulative probabilities as in former researches, which can be attributed to both the limitation of sampling area and effect of thermodynamic process. |
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