Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.envpol.2017.06.091 |
Contribution of biogenic and photochemical sources to ambient VOCs during winter to summer transition at a semi-arid urban site in India | |
Sahu, L. K.; Tripathi, Nidhi; Yadav, Ravi | |
通讯作者 | Sahu, L. K. |
来源期刊 | ENVIRONMENTAL POLLUTION
![]() |
ISSN | 0269-7491 |
EISSN | 1873-6424 |
出版年 | 2017 |
卷号 | 229页码:595-606 |
英文摘要 | This paper presents the sources and characteristics of ambient volatile organic compounds (VOCs) measured using 1,fR-TOF-MS instrument in a metropolitan city of India during winter to summer transition period. Mixing ratios of VOCs exhibited strong diurnal, day-to-day and episodic variations. Methanol was the most dominant species with monthly mean values of 18-22 pbbv. The emission ratios of VOCs relative to benzene calculated from nighttime data were used to estimate the relative contributions of vehicle exhaust and other sources. The increasing daytime ratios of oxygenated-VOCs (OVOCs)/benzene and isoprene/benzene from February to March indicates increasing contribution of photo-oxidation and biogenic sources. Daytime fractions of acetone (18%), acetaldehyde (15%) and isoprene (4.5%) to the sum of measured VOCs in March were higher than those in February. Variations of VOCs at lower temperatures (<25 degrees C) were predominantly controlled by anthropogenic sources. At high temperatures, particularly in the range of 32-40 degrees C during March, levels of OVOCs and isoprene were influenced by biogenic emissions. The emissions of OVOCs from vehicle exhaust were estimated to be smaller (20-40%) than those from other sources. The contributions of biogenic and secondary sources to OVOCs and isoprene increased by 10-15% from winter to summer. This study provides evidence that the winter-to-summer transition has an impact on sources and composition of VOCs in tropical urban areas. (C) 2017 Elsevier Ltd. All rights reserved. |
英文关键词 | PTR-TOF-MS VOCs Biogenic Winter-summer Urban Topical India |
类型 | Article |
语种 | 英语 |
国家 | India |
收录类别 | SCI-E |
WOS记录号 | WOS:000410010200062 |
WOS关键词 | VOLATILE ORGANIC-COMPOUNDS ; ANTHROPOGENIC EMISSIONS ; WESTERN INDIA ; ISOPRENE ; MODEL ; SIMULATIONS ; TROPOSPHERE ; ATMOSPHERE ; AEROSOLS ; RATIOS |
WOS类目 | Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/198748 |
作者单位 | Phys Res Lab, Ahmadabad 380009, Gujarat, India |
推荐引用方式 GB/T 7714 | Sahu, L. K.,Tripathi, Nidhi,Yadav, Ravi. Contribution of biogenic and photochemical sources to ambient VOCs during winter to summer transition at a semi-arid urban site in India[J],2017,229:595-606. |
APA | Sahu, L. K.,Tripathi, Nidhi,&Yadav, Ravi.(2017).Contribution of biogenic and photochemical sources to ambient VOCs during winter to summer transition at a semi-arid urban site in India.ENVIRONMENTAL POLLUTION,229,595-606. |
MLA | Sahu, L. K.,et al."Contribution of biogenic and photochemical sources to ambient VOCs during winter to summer transition at a semi-arid urban site in India".ENVIRONMENTAL POLLUTION 229(2017):595-606. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。