植物源挥发性有机化合物的排放特征及其对臭氧浓度的贡献

张欢; 石辉; 王会霞; 陈立军

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (10) : 5410-5421.

大气污染与控制

植物源挥发性有机化合物的排放特征及其对臭氧浓度的贡献

张欢¹, 石辉^1,2, 王会霞¹, 陈立军³

作者信息 +

Emission characteristics of biogenic volatile organic compounds and their contribution to ozone concentrations

ZHANG Huan¹, SHI Hui^1,2, WANG Hui-xia¹, CHEN Li-jun³

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摘要

植物源挥发性有机化合物(BVOCs)是形成臭氧(O₃)的重要前驱物质,合理认识BVOCs对臭氧污染的贡献,对区域空气质量及环境管理具有重要意义,因此,本研究基于MEGANv3.2和CMAQ模型,结合WRF模拟气象场及MODIS叶面积指数(LAI)数据,估算了2023年陕西省域的BVOCs排放强度以及其对臭氧浓度的贡献.结果表明:WRF模拟的气温趋势和辐射精度满足区域气象输入需求,风速和湿度的可靠性尚需提升;CMAQ模拟的臭氧浓度与实测值具有显著相关性,但整体浓度偏低,经回归关系得到的修正系数1.15修正后与实测结果吻合.全省总BVOCs的平均排放强度为3.37t/(km²·a),高值区主要分布于陕南秦巴山区(5.77t/(km²·a))及延安市桥山和黄龙山(4.74t/(km²·a))等森林覆盖度高的天然林分布区;低值区主要位于榆林区域的草原地带(0.46t/(km²·a))、延安北部的森林草原过渡区域(0.97t/(km²·a))及关中盆地区域(2.21t/(km²·a)).BVOCs的排放强度具有明显的月变化和日变化特征.在年内7月份达到最高为0.99t/km²;在日内午时14:00达到最高为98.65kg/km².异戊二烯(ISOP)、单萜烯(TERP)和倍半萜烯(SESQ)是BVOCs的主要组分,分别占37.39%、28.49%和3.56%;其变化趋势与BVOCs相似.乔木和灌木是BVOCs的主要来源,分别贡献了51%和35%.7月BVOCs对陕西省域月均最大8h臭氧浓度的平均贡献率为9.9%,其中,异戊二烯和单萜烯分别占BVOCs贡献的60.5%和14.8%;10月BVOCs对月均最大8h臭氧浓度的平均贡献率降至3.1%.

Abstract

Biogenic volatile organic compounds (BVOCs) are important precursors of ozone (O₃) formation. A rational understanding of the contribution of BVOCs to O₃ pollution is highly significant for regional air quality and environmental management. This study estimated the BVOCs emission intensity and their contribution to O₃ concentration in Shaanxi Province in 2023 based on the MEGANv3.2 and CMAQ models, combined with WRF-simulated meteorological fields and MODIS leaf area index (LAI) data. The results showed that: The WRF model accurately simulated temperature trends and radiation, meeting the requirements for regional meteorological input; but the reliability of wind speed and humidity simulations requires further improvement. The CMAQ-simulated O₃ concentrations exhibited a significant correlation with measured values, though the overall concentrations were underestimated. After applying a regression-derived correction factor of 1.15, the simulated results aligned well with observations. The average BVOCs emission intensity across the province was 3.37t/(km²·a). High-emission areas were primarily distributed in the Qinba Mountains of southern Shaanxi (5.77t/(km²·a)) and the Qiaoshan and Huanglongshan areas of Yan’an (4.74t/(km²·a)), both of which are regions with high natural forest coverage. Low-emission areas were mainly located in the grassland regions of Yulin (0.46t/(km²·a)), the forest-steppe transition zone in northern Yan’an (0.97t/(km²·a)), and the Guanzhong Basin (2.21t/(km²·a)). BVOC emissions exhibited distinct monthly and diurnal variations, peaking in July (0.99t/km²) annually and at 14:00 (local time) daily with a maximum value of 98.65kg/km². Isoprene (ISOP), monoterpenes (TERP), and sesquiterpenes (SESQ) were the main BVOC components, accounting for 37.39%, 28.49%, and 3.56%, respectively, with variation trends similar to total BVOCs. Trees and shrubs were the dominant sources, contributing 51% and 35%, respectively. In July, BVOCs contributed an average of 9.9% to the monthly mean maximum 8-hour O₃ concentration in Shaanxi Province, with ISOP and TERP accounting for 60.5% and 14.8% of this contribution, respectively. In October, the average contribution of BVOCs to the monthly mean maximum 8-hour ozone concentration decreased to 3.1%.

导出引用

张欢, 石辉, 王会霞, 陈立军. 植物源挥发性有机化合物的排放特征及其对臭氧浓度的贡献[J]. 中国环境科学. 2025, 45(10): 5410-5421

ZHANG Huan, SHI Hui, WANG Hui-xia, CHEN Li-jun. Emission characteristics of biogenic volatile organic compounds and their contribution to ozone concentrations[J]. China Environmental Science. 2025, 45(10): 5410-5421

中图分类号： X511

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