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

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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.

収録刊行物

  • Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 13(2), 169-176, 1997-04-10

    The Japan Society for Analytical Chemistry

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各種コード

  • NII論文ID(NAID)
    10002410871
  • NII書誌ID(NCID)
    AA10500785
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09106340
  • NDL 記事登録ID
    4196970
  • NDL 雑誌分類
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL 請求記号
    Z54-F482
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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