评估寒流通道和空气污染对朝鲜半岛空气污染的综合性模式的作用
Jung-Woo Yoo1, Soon-Young Park2, Hyun-Young Jo1
1Institute of Environmental Studies, Pusan National University, Busan, 46241, Republic of Korea.
Environmental pollution (Barking, Essex : 1987)
|March 23, 2024
概括
冷战线可以迅速增加PM2.5空气污染,即使当地的排放量很低. 数字建模显示,前额后的同视模式和地形影响的垂直向导显著导致高PM2.5度.
科学领域:
- 大气科学 大气科学
- 空气质量建模空气质量模型
- 环境科学 环境科学
背景情况:
- 寒流经过后细颗粒物 (PM2.5) 度的快速增加是空气质量的一个重大问题,特别是在局部排放有限的地区.
- 了解驱动这些污染事件的气象和化学机制对于有效的空气质量管理至关重要.
研究的目的:
- 通过使用数值模拟来分析寒流经过后PM2.5度迅速高的现象.
- 研究气象因素和大气过程在PM2.5积累中的作用.
- 为了区分PM2.5度变化的不同阶段的各种过程的贡献.
主要方法:
- 使用天气研究和预报 (WRF) 模型和社区多层次空气质量 (CMAQ) 建模系统进行了数值实验.
- 分析了2018年1月14日至23日的观测数据,根据PM2.5度特征将事件分为两个阶段.
- 在CMAQ内部使用综合工艺速率 (IPR) 分析来评估水平和垂直向导过程的贡献.
主要成果:
- 分析证实了与寒流通道相关的气象影响,包括温度下降,风速增加和相对湿度上升,与PM10和PM2.5水平升高相吻合.
- CMAQ的IPR分析表明,水平向导将PM2.5运送到更高的海拔,而地形影响的垂直向导增加了表面PM2.5度.
- 第二阶段的特点是PM2.5度较高 (64μg·m−3),与第一阶段 (35μg·m−3) 相比,垂直向导的贡献更大,与冷战后的明显的同视模式有关.
结论:
- 大气稳定性,空气沉降和温度逆转层在寒冷前线之后创造了有利于空气污染物积累的条件.
- 该研究阐明了朝鲜半岛空气污染的机制,在由冷战线通道驱动的非静止气象条件下.
- 冷战线对空气质量的影响是可变的,并且取决于它们经过后演变的同视模式.
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