Vertical distributions of VOCs in the Tibetan Plateau background region

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric and Oceanic Science Letters Pub Date : 2024-11-01 DOI:10.1016/j.aosl.2024.100516

Xuanxuan Xue , Fugeng Zha , Yinghong Wang , Yang Zhang , Yu Wang , Ying Shen , Yanyu Kang , Dan Yao , Guiqian Tang , Jianchun Bian , Yuesi Wang

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Abstract

Exploring the vertical variation in volatile organic compounds (VOCs) in background regions can provide information on the spatial distribution of pollutants, providing a scientific basis for atmospheric pollution prevention and control strategies. From 15 August to 5 September 2023, at the Southeast Tibet Mountain Comprehensive Environmental Observation Station (SETS), a tethered balloon was used to sample VOCs every 100 m from the ground to 1000 m. A total of 403 air bag samples were collected, and 39 vertical profiles of VOCs were obtained. Ninety-two VOC species were detected. The VOC concentration at the SETS did not change significantly vertically, and the average VOC concentration was 11.1 ± 2.4 ppbv. The main components were alkanes (51.4 %), alkenes (18.7 %), and halohydrocarbons (18.1 %). There was no obvious diurnal change in VOCs and no significant difference between the different layers. When the surface VOC concentration was less than 10 ppbv, the concentrations, components, and sources of VOCs were evenly distributed vertically, and the main sources of VOCs at different heights were vehicle exhaust and background. When the surface VOC concentration exceeded 10 ppbv, the VOC concentration gradually decreased with height. The proportion of alkanes in surface VOCs increased, and the source was mainly vehicle exhaust. This study confirmed that VOCs are vertically homogeneous in the background of the Tibetan Plateau, emphasizing the importance of vehicle emissions as a potential source of VOCs.

摘要

研究背景区域挥发性有机物 (VOCs) 的垂直变化规律, 可以提供污染物的空间分布信息, 为制定大气污染防治策略提供科学依据. 2023年夏季, 利用系留气艇对藏东南背景区域VOCs垂直分布规律进行研究, 共获取92种VOC的39条垂直廓线. 结果表明, VOC浓度垂直分布均一, 平均浓度为11.1 ± 2.4 ppbv; 主要成分为烷烃 (51.4 %), 烯烃 (18.7 %) 和卤代烃 (18.1 %). 地表VOC浓度小于10 ppbv时, 不同高度VOCs的主要来源为机动车尾气和背景贡献. 而地表VOC浓度超过10 ppbv时, 烷烃占比增加, 来源以机动车尾气为主. 该研究证实了青藏高原VOC在垂直方向上分布均一, 强调了机动车排放作为VOCs潜在来源的重要性.

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青藏高原本底区域挥发性有机化合物的垂直分布

探索本底区域挥发性有机物（VOCs）的垂直变化，可以提供污染物的空间分布信息，为大气污染防治策略提供科学依据。2023 年 8 月 15 日至 9 月 5 日，在藏东南山地环境综合观测站（SETS），利用系留气球从地面至 1000 米处每隔 100 米进行一次 VOCs 采样，共采集 403 个气囊样品，获得 39 条 VOCs 垂直剖面图。共检测到 92 种挥发性有机化合物。在垂直方向上，SETS 的挥发性有机化合物浓度变化不大，平均浓度为 11.1 ± 2.4 ppbv。主要成分为烷烃（51.4%）、烯烃（18.7%）和卤代烃（18.1%）。挥发性有机化合物没有明显的昼夜变化，不同层之间也没有显著差异。当地表挥发性有机化合物浓度小于 10 ppbv 时，挥发性有机化合物的浓度、成分和来源呈均匀的垂直分布，不同高度的挥发性有机化合物主要来源于汽车尾气和背景。当地表挥发性有机化合物浓度超过 10 ppbv 时，挥发性有机化合物浓度随高度逐渐降低。表面挥发性有机化合物中烷烃的比例增加，其来源主要是汽车尾气。这项研究证实了青藏高原背景区域挥发性有机物在垂直方向上是均匀的，强调了汽车尾气作为挥发性有机物潜在来源的重要性。摘要研究背景区域挥发性有机物 (VOCs) 的垂直变化规律，可以提供污染物的空间分布信息，为制定大气污染防治策略提供科学依据。2023 年夏季，利用系留气艇对东南背景区域 VOCs 垂直分布规律进行研究，共获取 92 种 VOC 的 39 条垂直廓线。结果表明，VOC 浓度垂直分布均一，平均浓度为 11.1 ± 2.4 ppbv; 主要成分为烷烃 (51.4 %), 烯烃 (18.7 %) 和卤代烃 (18.1 %)。地表 VOC 浓度小于 10 ppbv 时，不同高度 VOCs 的主要来源为机动车尾气和背景贡献。而地表 VOC 浓度超过 10 ppbv 时，烷烃占比增加，来源以机动车尾气为主。该研究证实了青藏高原 VOC 在垂直方向上分布均一，强调了机动车排放作为 VOCs 潜在来源的重要性。

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