对中国西双版纳的甲醛和乙二醛进行地基 MAX-DOAS 观测

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Yu Zhang , Xingwei Man , Sanbao Zhang , Li Liu , Fanhao Kong , Tao Feng , Rui Liu
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引用次数: 0

摘要

2021 年 11 月 1 日至 2022 年 6 月 30 日期间,在中国云南西双版纳进行了多轴差分光学吸收光谱(MAX-DOAS)测量,以获得甲醛(HCHO)和乙二醛(CHOCHO)的垂直分布。观测结果表明,在生物质燃烧期间,HCHO 和 CHOCHO 浓度的垂直柱密度(VCD)和体积混合比(VMR)均有所上升。来自 TROPOMI 的 HCHO 和 CHOCHO 的 VCD 与 MAX-DOAS 的观测结果非常吻合。(r2hcho = 0.71;r2chocho = 0.70)。关于季节变化,在生物质燃烧期间,HCHO 主要占据上层(400-800 米),这可能是由于燃烧期间羽流上升时形成了二次 HCHO。CHOCHO 主要分布在低层(0-200 米),这表明与 CHOCHO 相比,HCHO 的寿命更长,从而阻止了 CHOCHO 向高空扩散。关于日变化规律,HCHO 和 CHOCHO 的 VMR 均在 9:00 和 13:00 出现峰值,这是由于夜间积累和中午氧化所致。此外,我们还利用 CHOCHO 与 HCHO 的比率(RGF)调查了挥发性有机化合物(VOC)的来源。在生物质燃烧期间,各层的日 RGF 差异很小,表明生物质燃烧是主要来源。在非生物物质燃烧期间,各层间的日 RGF 差异很大,表明在此期间主要是生物和人为排放源造成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ground-based MAX-DOAS observations of formaldehyde and glyoxal in Xishuangbanna, China

Multi-axial differential optical absorption spectroscopy (MAX-DOAS) measurements were conducted in Xishuangbanna, Yunnan, China, between November 1, 2021 and June 30, 2022 to obtain vertical distributions of formaldehyde (HCHO) and glyoxal (CHOCHO). The observations show an increase in vertical column densities (VCDs) and volume mixing ratios (VMRs) for both HCHO and CHOCHO concentrations during periods of biomass combustion. The VCDs of HCHO and CHOCHO from TROPOMI are in good agreement with the MAX-DOAS observations. (R2HCHO = 0.71; R2CHOCHO = 0.70). Regarding seasonal variations, HCHO predominantly occupies the upper layer (400-800 m) during the biomass burning, possibly attributed to the formation of secondary HCHO as the plume ascends during combustion. CHOCHO is primarily found in the lower layer (0-200 m), suggesting a longer lifespan for HCHO compared to CHOCHO, preventing the latter from diffusing to higher altitudes. Concerning the daily variation patterns, both HCHO and CHOCHO VMRs exhibited peaks at 9:00 and 13:00, which were attributed to the nighttime accumulation and midday oxidation. Furthermore, we also investigated the sources of volatile organic compounds (VOCs) using the CHOCHO to HCHO ratio (RGF). During the period of biomass burning, there are minimal differences in the daily RGF across layers, indicating that biomass burning is the predominant source. During the non-biomass burning period, the daily RGF shows significant differences among layers, indicating that emissions from biological and anthropogenic sources primarily contribute during the period.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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