深圳市春夏BVOCs浓度变化、来源及影响因素

孙溢华; 皇甫宜博; 袁斌; 何贤俊; 张春生; 刘爱明; 杨红龙; 邵敏

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (7) : 3604-3613.

大气污染与控制

深圳市春夏BVOCs浓度变化、来源及影响因素

孙溢华¹, 皇甫宜博¹, 袁斌¹, 何贤俊¹, 张春生², 刘爱明², 杨红龙², 邵敏¹

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Concentration variations, sources, and influencing factors of BVOCs in Shenzhen during spring and summer.

SUN Yi-hua¹, HUANGFU Yi-bo¹, YUAN Bin¹, HE Xian-jun¹, ZHANG Chun-sheng², LIU Ai-ming², YANG Hong-long², SHAO Min¹

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摘要

为研究城市地区天然源挥发性有机物(BVOCs)的浓度变化、来源特征及与相关环境因素的关系,于2024年春夏季节在深圳市气象梯度塔,应用质子转移反应飞行时间质谱仪(PTR-ToF-MS)对100m处BVOCs浓度开展了测量.结果显示,观测期间异戊二烯、甲基乙烯基酮＋甲基丙烯醛(MVK+MACR)和单萜烯的浓度分别为(0.24±0.29)×10^-9、(0.20±0.22)×10^-9和(0.11±0.14)×10^-9.由于环境条件差异以及向上空传输过程的氧化消耗,异戊二烯的浓度低于文献报导中的北京春夏季节观测到的地面浓度.时间特征上,BVOCs浓度高值出现在温度和光照最高的中午;空间特征上,BVOCs浓度高值出现在风向为植被旺盛的南向.结合产物浓度计算获得的初始异戊二烯浓度远远高于异戊二烯的观测浓度,表明观测气团的老化程度较高.基于示踪物的来源解析结果显示人为源对单萜烯浓度的平均贡献仅为9.9%,但在夜间其贡献可达21.7%.温度是影响BVOCs浓度的重要环境因素,研究发现相比于异戊二烯观测浓度,初始异戊二烯浓度与温度拟合的经验系数与MVK+MACR的更加一致,表明初始异戊二烯能够更好的代表植物排放时对温度的依赖.

Abstract

To investigate concentration variations, source characteristics, and relationships with environmental factors of biogenic volatile organic compounds (BVOCs) in urban areas, we conducted measurements of BVOCs at 100meters using a proton transfer reaction mass spectrometer (PTR-ToF-MS) at the Shenzhen Meteorological Gradient Tower in the spring and summer of 2024. During the observation period, the concentrations of isoprene, Methacrolein+methyl vinyl ketone (MVK+MACR), and monoterpenes were measured at (0.24±0.29)×10^-9, (0.20±0.22)×10^-9, and (0.11±0.14)×10^-9, respectively. These results indicate the isoprene concentrations were lower than those reported in Beijing during the same seasons, likely due to differences in environmental conditions and oxidation during vertical transport. Temporally, BVOC concentrations peaked at midday under high temperatures and strong sunlight. Spatially, higher concentrations were observed in the upwind direction towards the south, where vegetation is lush. The initial isoprene concentrations, calculated from the product concentrations, were significantly higher than the observed concentrations, suggesting a high degree of air mass aging. Source apportionment based on tracers revealed that the average contribution of anthropogenic sources to monoterpene concentrations was only 9.9%, but this contribution could reach 21.7% at night. Temperature was identified as a significant environmental factor influencing BVOC concentrations. The study found that the empirical coefficients of initial isoprene concentrations with temperature were more consistent with those of MVK+MACR than with observed isoprene concentrations, indicating that initial isoprene better represents the temperature dependence of plant emissions.

导出引用

孙溢华, 皇甫宜博, 袁斌, 何贤俊, 张春生, 刘爱明, 杨红龙, 邵敏. 深圳市春夏BVOCs浓度变化、来源及影响因素[J]. 中国环境科学. 2025, 45(7): 3604-3613

SUN Yi-hua, HUANGFU Yi-bo, YUAN Bin, HE Xian-jun, ZHANG Chun-sheng, LIU Ai-ming, YANG Hong-long, SHAO Min. Concentration variations, sources, and influencing factors of BVOCs in Shenzhen during spring and summer.[J]. China Environmental Science. 2025, 45(7): 3604-3613

中图分类号： X511

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