高温天气对生物源排放及其O3生成贡献的影响:以四川盆地2022年7-8月为例
Effects of High Temperature on Biogenic Emissions and O3 Generation:A Case Study of Sichuan Basin from July to August 2022
龙启超 1乔玉红 2姜涛 3李媛 3何敏 4骆丽红1
作者信息
- 1. 四川省生态环境科学研究院,四川 成都 610041;四川省环保科技工程有限责任公司,四川 成都 610041
- 2. 重庆市生态环境科学研究院,重庆 401147
- 3. 四川省生态环境科学研究院,四川 成都 610041
- 4. 成都信息工程大学资源环境学院,四川 成都 610225
- 折叠
摘要
2022 年 7-8 月,四川盆地气温同比上升 3.63℃,O3 污染天比往年大幅增加.为了解高温天气对四川盆地生物源排放及其O3 生成贡献的影响,基于WRF模拟获取的气象数据,利用MEGAN模型估算了四川盆地 2022 年 7-8 月生物源挥发性有机物(BVOCs)排放量,分析了BVOCs及其化学物种的时空分布特征,并利用空气质量模型CMAQ定量评估了高温天气下BVOCs排放对O3 生成的影响.结果表明:①四川盆地 2022 年 7-8 月BVOCs排放量为 86.30×104 t,其中,异戊二烯、甲醇、单萜烯的排放量分别为 42.16×104、17.32×104、9.92×104 t;成都平原、川南、川东北城市群BVOCs排放强度分别为 3.61、6.55、5.00 t/km2.②BVOCs排放高值区主要集中在川南城市群的宜宾市和泸州市中部、成都平原城市群的乐山市东北部以及川东北城市群的巴中市和达州市北部;异戊二烯和单萜烯排放空间分布特征与BVOCs排放空间分布特征基本一致,而甲醇空间分布特征具有显著差异.③BVOCs排放有明显的日变化特征,最大排放量出现在 14:00.④CMAQ模拟结果显示,BVOCs排放对O3 生成贡献率较大的城市有乐山市、眉山市、雅安市和内江市,其贡献率均超过 30%.空间分布上,成都平原城市群的乐山市北部和眉山市中西部BVOCs排放对O3 生成贡献最显著.2022 年 7-8 月高温天气下BVOCs排放对O3 生成贡献同比增长 4.99%.研究显示,四川盆地BVOCs排放对O3 污染有重要影响,且高温天气下其对O3 生成的贡献率进一步增加,是O3 污染防治关注的重点.
Abstract
From July to August 2022,the temperature in the Sichuan Basin was 3.63℃higher than that of last year,and the number of ozone pollution days increased significantly compared to previous years.To understand the effects of high temperature on biogenic emissions and O3 generation contribution in the Sichuan Basin,the Model of Emissions of Gases and Aerosols from Nature(MEGAN)was used to estimate the emissions of biogenic volatile organic compounds(BVOCs)in the Sichuan Basin from July to August 2022 based on the meteorological data obtained by Weather Research and Forecasting(WRF)simulations.The spatiotemporal distribution characteristics of BVOCs and chemical species were analyzed.The impact of BVOCs emissions on O3 generation in high temperature weather was quantitatively evaluated by a Community Multi-Scale Air Quality(CMAQ)model.The results showed that:(1)From July to August 2022,BVOCs emissions in the Sichuan Basin were 86.30×104 t,and the emissions of isoprene,methanol and monoterpenes were 42.16×104,17.32×104 and 9.92×104 t,respectively.The BVOCs emission intensities of Chengdu Plain urban agglomeration,South Sichuan urban agglomeration,and Northeast Sichuan urban agglomeration were 3.61,6.55 and 5.00 t/km2,respectively.(2)The high emission areas of BVOCs were mainly concentrated in the central parts of Yibin City and Luzhou City in the South Sichuan urban agglomeration,the northeastern part of Leshan City in the Chengdu Plain urban agglomeration,and the northern parts of Bazhong City and Dazhou City in the Northeastern Sichuan urban agglomeration.The spatial distribution characteristics of isoprene and monoterpene emissions were basically consistent with those of BVOCs emissions,while the spatial distribution characteristics of methanol showed significant differences.(3)BVOCs emissions had an obvious diurnal characteristic and the highest emission occurred at 14:00.(4)The CMAQ simulation results showed that the cities with large contributions of BVOCs emissions to O3 generation were Leshan,Meishan,Ya'an,and Neijiang,with contribution rate of over 30%.In terms of spatial distribution,BVOCs emissions in the northern part of Leshan and the central-western parts of Meishan in Chengdu Plain urban agglomeration had the most significant contribution to O3 generation.From July to August 2022,the contribution of BVOCs emissions to O3 generation in high temperature weather was 4.99%higher than that of last year.Based on the above research results,BVOCs emissions in Sichuan Basin has an significant impact on O3 pollution,and the contribution rate to O3 generation further increases in high temperature weather,which is the focus for O3 pollution prevention and control.
关键词
生物源挥发性有机物(BVOCs)/MEGAN/时空分布/CMAQ/O3/四川盆地Key words
biogenic volatile organic compounds(BVOCs)/MEGAN/spatiotemporal distribution/CMAQ/O3/Sichuan Basin引用本文复制引用
基金项目
四川省科技计划(2023YFS0383)
四川省生态环境保护科技计划(2023HB37)
出版年
2023
NETL
NSTL
万方数据