Regional Transport Increases Ammonia Concentration in Beijing, China

文献类型： 外文期刊

第一作者： Wang, Qingmei

作者： Wang, Qingmei;Wang, Ligang;Miao, Yucong

作者机构：

关键词： regional transport; WRF-Chem; backward trajectory analysis; thermal stratification

期刊名称：ATMOSPHERE （ 影响因子：2.686； 五年影响因子：2.848 ）

ISSN：

年卷期： 2020 年 11 卷 6 期

页码：

收录情况： SCI

摘要： To elucidate the critical factors influencing the ammonia (NH3) concentration in Beijing, this study combined observational analyses, backward trajectory calculations, and meteorology-chemistry coupled simulations to investigate the variations in the NH(3)concentration from 11 May to 24 June, 2015. A significant positive correlation was found between the NH(3)and PM(2.5)concentrations in Beijing. By examining the relationships between meteorological parameters and the NH(3)concentration, both near-surface temperature and relative humidity showed positive correlations with the NH(3)concentration. The higher NH(3)concentrations were usually associated with the warming of the upper atmosphere. Distinct wind directions were noted during the days of the top and bottom 33.3% NH(3)concentrations. The top 33.3% concentrations were primarily related to southwesterly winds, while the bottom ones were associated with westerly and northerly winds. Since there are strong NH(3)emissions in the southern plains adjacent to Beijing, the regional transport induced by the southerly prevailing winds would increase the NH(3)concentration in Beijing significantly. From 23 to 25 May, more than one third of NH(3)in Beijing was contributed by the southerly transport processes. Thus, joint efforts to reduce NH(3)emissions in the whole Beijing-Tianjin-Hebei region are necessary to regulate the NH(3)concentration in Beijing.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序