黄海西部降水pH值的年度及季节统计特征

 采用内核密度估计方法对黄海西部降水pH值年度/季节特征进行了分析.结果显示,降水pH值年度内核密度估计图相似,呈典型双态分布,以低pH值峰为主.季节性分布特征春、夏、冬季相近,低pH值峰为主,秋季高pH值峰为主.该海域降水pH值特征是陆源输入与海源输入相互影响的结果.根据数据非正态分布特点,采用bootstrap模拟取样获得的降水pH代表值显示,黄海西部降水总体呈弱酸雨特征,年度与季节性pH代表值都呈弱酸性,且年度降水pH值变化范围要大于季节性变化,降水酸性依次为春季>冬季>秋季>夏季,季节性特征较显著.

Analysis of annual and seasonal statistical characteristics of rainwater pH value in west of Yellow Sea

The annual/seasonal characteristics of rainwater pH value in west of Yellow Sea was analyzed adopting kernel density estimation technique. The annual rainwater pH value kernel density estimation figure was similar, appearing typical double form distribution, with low pH value peak as the main. The seasonal distribution characteristics of spring, summer and winter was near, with low pH value peak as the main, the autumn high pH value peak was the main. The characteristic of this sea area rainwater pH value was the result of the mutual influence of the inputs of land and sea sources. On the basis of data non-normal distribution characteristics, the rainwater pH representative value obtained from adopting bootstrap resampling showed that the rainwater total in west of Yellow Sea appeared weak acid, rain characteristics annual and seasonal pH representative values all appeared weak acidic, the annual rainwater pH value change was greater than seasonal change, the rainwater acidity successively was spring>winter>autumn>summer. The seasonal characteristic was marked.