沼气发电厂附近受压松树林中生物挥发性有机化合物及其氧化产物的特征

IF 5.2 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Junwei Song, Georgios I. Gkatzelis, Ralf Tillmann, Nicolas Brüggemann, Thomas Leisner, Harald Saathoff
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引用次数: 0

摘要

摘要在本研究中,我们介绍了 2020 年 6 月在德国西部靠近沼气发电厂 (BPP) 的一片受树皮甲虫和之前干旱影响的松树林中对有机气溶胶 (OA) 和生物挥发性有机化合物 (BVOC) 的实时测量结果。为测量 OA 和 BVOC,使用了质子转移反应飞行时间质谱仪(CHARON-PTR-ToF-MS)和 Vocus-PTR-ToF-MS。在整个测量期间,单萜的平均浓度(2.5 ± 5.3 ppb)高于异戊二烯(0.58 ± 0.54 ppb)和倍半萜(0.01 ± 0.01 ppb)。OA 成分主要由单萜烯氧化形成的半挥发性有机化合物组成。根据风向分析,BVOC 数据被分为两组,分别主要受 BPP(WD-BPP)和森林(WD-forest)的影响。在 WD-BPP 组中,高浓度的单萜烯和倍半萜烯归因于 BPP 排放。在 WD-森林组中,较高的温度增加了异戊二烯、单萜烯和倍半萜烯的生物排放,尤其是在白天,超过了它们的光化学消耗。挥发性有机化合物的正矩阵因式分解分析表明,在白天,BVOC 氧化产生的气态有机酸贡献很大,而在夜间,弱氧化的单萜产品占主导地位。此外,相对湿度的增加促进了气态弱氧化单萜产品的气体-颗粒分配,导致夜间 OA 质量增加。这项研究突出表明,BVOCs 及其氧化产物的变化受气象、当地 BPP 排放和该受压森林化学转化过程的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization of biogenic volatile organic compounds and their oxidation products at a stressed pine forest close to a biogas power plant
Abstract. In this study, we present real-time measurements of organic aerosol (OA) and biogenic volatile organic compounds (BVOCs) at a pine forest stressed by bark beetles and previous droughts close to a biogas power plant (BPP) in western Germany during June 2020. A proton-transfer-reaction time-of-flight mass spectrometer coupled with a particle inlet (CHARON-PTR-ToF-MS) and a Vocus-PTR-ToF-MS were deployed to measure OA and BVOCs. During the entire measurement period, the average concentration of monoterpenes (2.5 ± 5.3 ppb) was higher than isoprene (0.58 ± 0.54 ppb) and sesquiterpenes (0.01 ± 0.01 ppb). The OA composition mainly consisted of semi-volatile organic compounds formed from monoterpene oxidation. Based on a wind direction analysis, BVOC data were categorized into two groups with main influence from the BPP (WD-BPP) and the forest (WD-forest), respectively. In the WD-BPP group, high concentrations of monoterpenes and sesquiterpenes were attributed to BPP emissions. In the WD-forest group, higher temperatures enhanced the biogenic emissions of isoprene, monoterpenes, and sesquiterpenes especially during daytime, exceeding their photochemical consumption. Positive matrix factorization analysis of VOCs revealed substantial contributions of gaseous organic acids from BVOC oxidation during daytime, while weakly oxidized monoterpene products dominated during nighttime. Moreover, increasing relative humidity promoted the gas-to-particle partitioning of gaseous weakly oxidized monoterpene products, leading to an increase of nighttime OA mass. This study highlights that the variations of BVOCs and their oxidation products are influenced by meteorology, local BPP emissions, and chemical transformation processes at this stressed forest.
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来源期刊
Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics 地学-气象与大气科学
CiteScore
10.70
自引率
20.60%
发文量
702
审稿时长
6 months
期刊介绍: Atmospheric Chemistry and Physics (ACP) is a not-for-profit international scientific journal dedicated to the publication and public discussion of high-quality studies investigating the Earth''s atmosphere and the underlying chemical and physical processes. It covers the altitude range from the land and ocean surface up to the turbopause, including the troposphere, stratosphere, and mesosphere. The main subject areas comprise atmospheric modelling, field measurements, remote sensing, and laboratory studies of gases, aerosols, clouds and precipitation, isotopes, radiation, dynamics, biosphere interactions, and hydrosphere interactions. The journal scope is focused on studies with general implications for atmospheric science rather than investigations that are primarily of local or technical interest.
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