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利用 １９６１～１９９０ 年 ３０ 年间东海的水文观测资料， 以 １°×１°经纬网格为单位， 统计计算累年各月透明度的平均值和大于等于 ２０ ｍ 的大透明度出现频率值， 并绘制了各月透明度分布图和大透明度出现频率分布图， 从而揭示了该海区透明度分布和变化的基本特征。
Based on the hydrographic data of the East China Sea from 1961 to 1990 and the latitude and longitude grids of 1 ° × 1 °, the average value of the transparency of each month of the year and the frequency of occurrence of the large transparency of 20 m or more were plotted The monthly transparency map and the transparency of the frequency of occurrence of the map, which reveals the distribution and changes in the transparency of the sea the basic characteristics.