Arctic sea ice distribution in summer based on aerial photos
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 of74.11°～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.
作 者： LU Peng LI Zhijun ZHANG Zhanhai DONG Xilu 作者单位： LU Peng,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)
刊 名： 海洋学报(英文版) SCI 英文刊名： ACTA OCEANOLOGICA SINICA 年，卷(期)： 2005 24(6) 分类号： P7 关键词： sea ice Arctic Ocean image processing fractals