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温带树种的季节性生物原性挥发性有机化合物排放因子:对排放估计和臭氧形成的影响

Ju Wu¹, Qiang Zhang², Luxi Wang¹

¹College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.

Environmental pollution (Barking, Essex : 1987)

|September 7, 2024

概括

北京的生物性挥发性有机化合物 (BVOC) 排放季节性变化.

科学领域:

大气化学和空气质量
生态与环境科学生态与环境科学
城市林业和污染控制

背景情况:

植物产生的生物性挥发性有机化合物 (BVOC) 排放是大气化学的重要因素,影响臭氧 (O3) 形成和空气质量.
不同树种和季节的BVOC排放的变化使准确的区域排放清单和制定有效的污染控制策略变得复杂.
现有的排放模型经常使用恒定排放因子,这可能不准确地反映了由环境因素和物种特定生理学影响的BVOC排放的动态性质.

研究的目的:

调查北京占主导地位的树种BVOC排放因子的季节性变化.
开发和应用每月动态标准排放因子 (SER-MDs),以改进城市BVOC排放及其对臭氧形成的影响的建模.
评估特定树种及其排放模式在推动北京臭氧污染中的作用.

主要方法:

在四个季节内对北京六种主要树种的排放因子进行了现场测量.
根据季节性排放率和温度响应能力开发的每月动态标准排放因子 (SER-MDs).
模拟全市和地区级BVOC排放量及其对臭氧形成的贡献,使用开发的SER-MDs.

主要成果:

BVOC排放在组成和排放率上表现出显著的季节性差异,与月平均温度有很强的相关性.
估计北京占主导地位的树种的BVOC总排放量为38.2 Gg/年,其中单烯 (49%) 和异烯 (11%) 是主要贡献者.
与恒定的排放因子相比,SER-MDs的使用将BVOC排放的高估值降低了31%-38%,强调了季节性动态的重要性.
由BVOC引起的最大臭氧度 (417μg m-3) 发生在8月份,其主要驱动因素是异烯,特别是来自*Quercus mongolica*和*Populus tomentosa*.

结论:

特定物种的BVOC季节性排放模式对于制定准确的城市排放清单和了解臭氧污染动态至关重要.
开发的SER-MD方法提供了更现实的BVOC排放估计,改善空气质量建模和政策制定.
在臭氧季节高峰期,有针对性地减少高异二烯排放的树木物种,可以成为一种有效的以自然为基础的战略,以改善北京和类似城市的城市空气质量.

关键词:

生物性挥发性有机化合物 (BVOC) 是一种生物性挥发性有机化合物.排放因子排放因子排放因子异二烯是一种异二烯.单二烯 (Monoterpene) 是一种单二烯.臭氧臭氧是什么?臭氧臭氧是一种季节性的节奏季节性的节奏

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