Numerical Evaluation of Contributions of Pollutant Sources Extracted by Constrained Oblique Rotational Factor Analysis for Precipitation Data. Extraction of Features of Precipitations at Hyogo and Akita Areas
Numerical Evaluation of Contributions of Pollutant Sources Extracted by Constrained Oblique Rotational Factor Analysis for Precipitation Data. Extraction of Features of Precipitations at Hyogo and Akita Areas
复制标题
通过降水数据的约束倾斜旋转因子分析提取的污染物源贡献的数值评估。
DOI：
10.2116/analsci.13.169
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发表时间：
1997
影响因子：
1.6
通讯作者：
T. Kimoto
中科院分区：
文献类型：
--
作者：
T. Ozeki;K. Koide;N. Ogawa;Tetsuya Adzuhata;M. Kajikawa;T. Kimoto
本课题组提出的“约束斜旋转因子分析”统计方法，可以从降水的化学成分对降水中的污染源进行特征还原和分组。应用于降水的研究表明，数值评估提取的源的贡献的必要性。在本文中，数值评估的程序进行了演示，并作为一个应用程序，在兵库县收集的降水量与秋田县进行了比较。分析表明，对提取的污染源进行离子平衡检查，可以给出提取污染源数量的简单标准。结果表明，这两个地区降水pH值降低的原因有两个：1）冬季季风从中国经日本海带来的以硫酸为主的酸性源; 2）国内排放的以硫酸和硝酸为主的酸性源。日本降水酸度的季节变化取决于这两种贡献的大小。
A statistical method developed by our group, “the constrained oblique rotational factor analysis” enables feature reduction and grouping of the pollutant sources in precipitations from their chemical compositions. A study applied to the precipitations has indicated the necessity of the numerical evaluation of contributions of the extracted sources. In this paper, a procedure for the numerical evaluation is demonstrated; and, as one application, the precipitations collected in Hyogo prefecture are compared with those in Akita prefecture. The analysis has proposed that an ion-balance check of the extracted pollutant source gives a simple criterion about how many pollutant sources should be extracted. As a result, the causes of lowering of the pH of the precipitation of these two areas are explained by two sources: 1) an acidic source with sulfuric acid predominant brought over the Sea of Japan from China by winter monsoons; and 2) another acidic source with sulfuric acid and nitric acid predominant emitted domestically. The seasonal changes of acidity of the precipitation of Japan depend upon the amounts of these two contributions.