Long Term Observations of C2-C5 Hydrocarbons in Osaka City.
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概要
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Hourly measurements of nine C<SUB>2</SUB>-C<SUB>5</SUB> species were made for a period of 15 months, in the center of Osaka city, Japan. The measurements were done by an automatic system consisted of a sample preconcentrator and gas chromatograph. The number of samples obtained was 8007, which corresponds to 81.2% of all potential measurements.<BR>The concentrations of all components were high in early winter and low in summer. The C<SUB>2</SUB>H<SUB>4</SUB> concentration was the highest amont the nine hydrocarbons while C<SUB>3</SUB>H<SUB>6</SUB> showed the lowset concentration throughout the year, and was rarely detected in summer. For C<SUB>4</SUB>-C<SUB>5</SUB> hydrocarbons concentrations, there were small annually variations in their concentrations. Regular diurnal patterns of hydrocarbons were observed, which were caused from emissions and meteorological effects. From the characteristic of their diurnal variations, three separate groups could be seen within the characteristic of their diurnal variations, three separate groups could be seen within the nine hydrocarbons;(1) C<SUB>2</SUB>H<SUB>6</SUB> and C<SUB>3</SUB>H<SUB>8</SUB>, (2) C<SUB>2</SUB>H<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>2</SUB> and C<SUB>3</SUB>H<SUB>6</SUB>, and (3) C<SUB>4</SUB> and C<SUB>5</SUB> hydrocarbons. Each hydrocarbons ratio to measured nine hydrocarbons were also examined. The significant difference were presented by different wind direction, which reflect characteristics of the source area and time progress from their sources to the monitoring point. A characteristic common to all wind direction was the increase of C<SUB>4</SUB>-C<SUB>5</SUB> ratio in summer. This phenomenon was correlated with ambient temperature indicating stronger emission of higher molecular hydrocarbons in summer.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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