PM2.5和O3变化的时空空间相关性:对协同调节的街道尺度视角
Xinyuan Lin1, Yangbin Dong1, Zuying Teng1
1College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China.
The Science of the total environment
|January 31, 2025
概括
街道水平的空气污染,包括细颗粒物 (PM2.5) 和臭氧 (O3),表现出复杂的模式. 它们的同步性受到交通,天气和空间尺度的影响,在中午达到顶峰.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 公共卫生 公共卫生
背景情况:
- 颗粒物 (PM2.5) 和臭氧 (O3) 是中国的重要空气污染物,对健康构成重大风险.
- 现有的研究主要针对城市和区域规模的PM2.5和O3控制.
- 与交通和通勤相关的PM2.5和O3在街道层面的共同调节仍未得到充分研究.
研究的目的:
- 在中国福州街道层面调查PM2.5和O3的时空动态.
- 分析影响PM2.5和O3度之间的同步因素.
- 了解当地排放源和气象条件对污染物共同监管的影响.
主要方法:
- 使用非线性统计方法来分析街道规模的移动测量数据.
- 采用随机森林 (RF) 模型来确定PM2.5-O3同步性的关键驱动因素.
- 检查了时空变化,并确定了污染物一致性的关键空间尺度 (800米).
主要成果:
- 在街道规模上,PM2.5和O3表现出多重和长期的持久性.
- PM2.5和O3之间的同向变化在中午达到顶峰,与交通或午夜模式不同.
- 确定了一个800米的空间尺度;在此以下,局部因素减少了一致性,而超越它,一致性增加了.
- 射频模型表明,PM2.5受到前体 (冬季) 和气象 (夏季) 的影响,而O3则始终受到气象的影响.
- 交通和建筑破坏了污染物的共同方向性,而高湿度减轻了度,但增强了同步性.
结论:
- 在街道层面的PM2.5和O3动态是复杂的,受多元化和持久性的影响.
- 污染物同步性表现出午间峰值,并且依赖规模,具有800米的值.
- 交通,建筑和气象因素显著调节PM2.5和O3的共同调节,湿度起着双重作用.
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