頁籤選單縮合
題名 | 臺北氣膠超級測站PM□質量與成分週循環變化分析=Analysis on the Monitoring Data at the Taipei Aerosol Supersite (TAS) for Demonstrating the PM□ Speciation Variations in Each Day of the Week |
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作者 | 張順欽; | 書刊名 | 行政院環境保護署環境監測及資訊處技術彙刊 |
卷期 | 3 2009.11[民98.11] |
頁次 | 頁1-22 |
分類號 | 445.63 |
關鍵詞 | 氣膠超級測站; 週末與工作日差異; 連續氣膠成份; 數目濃度; Aerosol supersite; Weekday/weekend differences; Continuous aerosol property; Particle number; |
語文 | 中文(Chinese) |
中文摘要 | 本研究分析2002年3月至2008年2月台北氣膠超級測站監測結果,展示一週各日空氣品質與氣膠成分的變化。週末因為交通量降低或污染排放源排放量的改變,原生性污染物(CO、NOXx及SO2)濃度均明顯下降。PM2.5質量與成分濃度卻僅有元素碳、OC、PAHs週日與工作日(weekday)日平均濃度差異達t-test 5%顯著水準;PM2.5質量、硝酸鹽、硫酸鹽濃度均未達顯著水準。週日交通量降低但PM2.5質量濃度無顯著變化,顯示來自交通污染直接排放的影響比例低。硝酸鹽濃度有顯著的日夜變化與週變化,在上午交通時段出現最高濃度。硫酸鹽濃度日夜變化及一週各日濃度變化均不明顯。顯示硫酸鹽濃度受本地污染排放直接影響小,應與區域性污染傳輸有關。 PAHs濃度有顯著的日夜及週循環變化與交通型態變化關係密切。氣膠總散光係數一週各日濃度變化約與PM2.5相似。週日與工作日的氣膠散射效率分別為5.67 m2 g-1 (r=0.88)及5.89 m2 g-1 (r=0.90)並無顯著差異。超細微粒數目濃度日夜變化,受交通型態變化影響相當顯著。由於台北盆地特殊的地理條件,前幾天排放的原生性氣膠以及後續形成的二次氣膠會在盆地內再循環,影響後一天的PM2.5濃度。雖然週一原生氣膠排放增加,但是因為二次氣膠的減少或老化氣膠長時間懸浮於空氣中,使得週一PM2.5濃度反而低於週日。本研究結果可以供作PM2.5污染管制策略參考。 |
英文摘要 | This study focused on the monitoring data analysis at the Taipei Aerosol Supersite (TAS) from March 2002 to February 2008 for demonstrating the air quality and aerosol speciation variations in each day of the week. The primary pollutants (CO, NOx and SO2) concentrations were significantly reduced on weekends due to lower traffic volume and emissions. Nevertheless, only the Sunday concentrations in EC, OC and PAHs of PM2.5 were significantly lower than those on weekdays at 5% level of t-test. Having no significant PM2.5 mass differences means that there exists lower impact from fresh vehicle emission on Sunday. The diurnal PM2.5 nitrate concentration distribution, with a high peak in the morning traffic hours, shows great variations from daytime to nighttime and from weekday to weekend as well. Similarly, significant diurnal variation and weekend/weekday difference of PM2.5 PAHs also revealed impact by vehicle emission. As for the PM2.5 sulfate, lacking of significant signs indicates the impact through regional pollutant transport to be greater than local pollution. Diurnal PM2.5 mass concentration variations of each day in the week is similar to the aerosol total scattering coefficient distribution, with the value of 5.67 m2 g-1 (r=0.88) on Sunday and 5.89 m2 g-1 (r=0.90) on weekdays, showing no significant difference respectively. The diurnal number concentration variation of ultrafine particles shows highly correlation with local traffic situation. As a result, the primary aerosol and the formed secondary aerosol may circulate over and over again in the Taipei basin and then affect the PM2.5concentrations for the following days. Due to the reduction of secondary aerosol or aged aerosol suspended longer time in the air, PM2.5 mass on Monday was lower than that of Sunday even with more primary aerosol emitted. These findings could provide important information for the formation of PM2.5 control strategies. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。