کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6326954 | 1619761 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Long term trends of methane, non methane hydrocarbons, and carbon monoxide in urban atmosphere
ترجمه فارسی عنوان
روندهای بلند مدت متان، هیدروکربنهای غیر متان و مونوکسید کربن در فضای شهری
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کلمات کلیدی
کربن، کل هیدروکربن، متان، هیدروکربن غیر متان، شهری، طولانی مدت،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
چکیده انگلیسی
The concentrations of methane (CH4), non-methane hydrocarbons (NMHC), and carbon monoxide (CO) were measured at two urban locations (Guro (GR) and Nowon (NW)) in Seoul, Korea between 2004 and 2013. The mean amount fractions of CH4, NMHC, and CO, measured at GR over this period were 2.06 ± 0.02, 0.32 ± 0.03, and 0.61 ± 0.05 ppm, respectively, while at NW they were 2.08 ± 0.06, 0.33 ± 0.05, and 0.54 ± 0.06 ppm, respectively. The ratio of CH4 to the total hydrocarbon amount fraction remained constant across the study years: 0.82 to 0.90 at GR and 0.81 to 0.89 at NW. Similarly, stable ratios were also observed between NMHC and THC at the two sites. In contrast, the annual mean ratios for CH4/NMHC showed a larger variation: between 4.55 to 8.67 at GR and 4.25 to 8.45 at NW. The seasonality of CO was characterized by wintertime maxima, while for CH4 and NMHC the highest amount fractions were found in fall. The analysis of their long-term trends based on Mann-Kendall and Sen's methods showed an overall increase of THC and CH4, whereas a decreasing trend was observed for NMHC and CO.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volumes 518â519, 15 June 2015, Pages 595-604
Journal: Science of The Total Environment - Volumes 518â519, 15 June 2015, Pages 595-604
نویسندگان
Ezaz Ahmed, Ki-Hyun Kim, Eui-Chan Jeon, Richard J.C. Brown,