Isoprene Emissions Response to Drought and the Impacts on Ozone and SOA in China
Isoprene Emissions Response to Drought and the Impacts on Ozone and SOA in China
复制标题
DOI：
10.1029/2020jd033263
复制
发表时间：
2021-04
期刊：
影响因子：
--
通讯作者：
Pengfei Wang;Yiming Liu;J. Dai;Xiao Fu;Xuemei Wang;A. Guenther;Tao Wang
中科院分区：
文献类型：
--
作者：
Pengfei Wang;Yiming Liu;J. Dai;Xiao Fu;Xuemei Wang;A. Guenther;Tao Wang
在影响异戊二烯排放的各种环境因素中，干旱只得到了有限的关注。在自然气体和气溶胶排放模式(Megan，Version 2.1)中实施了4种不同的干旱响应(DR)方案，并应用社区多尺度空气质量模式(CMAQ)研究了干旱年和平年对中国空气质量的影响。一般而言，除轻度干旱情况外，所有DR方案都减少了异戊二烯的排放。预测在严重干旱条件下，中国南部的异戊二烯排放量将显着减少甚至终止。在干旱期间，与臭氧监测仪(OMI)平均甲醛垂直柱密度(HCHO VCD)相比，同时考虑轻度干旱和严重干旱(SMD)的DR方案改善了模型的性能，特别是在重度干旱地区。结果表明，大多数DR方案降低了模拟臭氧(O_3)和二次有机气溶胶(SOA)的水平。对于臭氧和二氧化硫，四川盆地都预测了显著的变化(臭氧和二氧化硫分别为5 ppb和4微克m−3)。这项研究是首次模拟研究异戊二烯干旱响应对中国空气质量的影响。
Among the various environmental factors that affect isoprene emissions, drought has only been given limited attention. Four different drought response (DR) schemes were implemented in the Model of Emissions of Gases and Aerosols from Nature (MEGAN, version 2.1), and the Community Multiscale Air Quality (CMAQ) model was applied to investigate the drought impacts on air quality during both drought and normal years in China. Generally, all DR schemes decrease isoprene emissions except for mild drought conditions. The significant decrease and even termination of isoprene emissions are predicted in South China under severe drought conditions. During the drought period, the DR scheme considering both mild and severe drought (SMD) improves the model performance especially in severe drought‐hit regions when compared with the Ozone Monitoring Instrument (OMI) averaged formaldehyde vertical column density (HCHO VCD). The results show that most of the DR schemes decrease simulated ozone (O3) and secondary organic aerosols (SOA) levels. For both O3 and SOA, noticeable changes are predicted in the Sichuan Basin (5 ppb and 4 µg m−3 for O3 and SOA, respectively). This investigation is the first modeling study to investigate the impacts of isoprene drought response on air quality in China.