一个WRF-CMAQ模拟大气中的过氧乙酸盐和中国中部的来源分配
Yifei Wang1, Mei Sun2, Xueqi Qiao1
1State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
The Science of the total environment
|June 24, 2023
概括
中国中部大气中的过氧乙酸盐 (PAN) 受挥发性有机化合物 (VOC) 和NOx的影响. 减少这些前体,特别是VOCs,可以降低PAN,工业和运输是主要来源.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 空气质量建模空气质量模型
背景情况:
- 氧化酸 (PAN) 是光化学烟雾的关键成分,由挥发性有机化合物 (VOC) 和氧化 (NOx) 形成.
- 关于PAN分布,形成和来源的有限区域数据阻碍了对其大气行为和环境影响的理解.
研究的目的:
- 调查中国中部的PAN度变化和影响因素.
- 使用WRF-CMAQ模型模拟2019年7月期间的PAN动态.
主要方法:
- 使用WRF-CMAQ模型进行区域大气模拟.
- 对前体减排 (VOC和NOx) 进行了敏感性分析.
- 分析了PAN去除过程,包括干沉积和气相化学.
主要成果:
- 月均近地表面PAN度为0.4ppbv,随着海拔高度的增加而增加,并显示出显著的日间变化.
- 干沉积是主要的去除途径 (57%),其次是热分解 (43%).
- PAN度对VOC排放的减少比NOx的减少更为敏感.
结论:
- 减少VOC和NOx排放通常会降低PAN度,而VOC的效果更强.
- 在东部中部地区,减少的NOx和VOC可以增强大气氧化,从而可能限制PAN的减少.
- 工业 (39-49%) 和运输 (33-41%) 部门是影响中国中部PAN水平的主要来源.
相关概念视频
03:10Precipitation Reactions
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
02:58Balancing Redox Equations
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...