在东亚地区的气象驱动的PM2.5年间变化
Chi-Yun Wang1, Jen-Ping Chen2, Wei-Chyung Wang3
1Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan; Atmospheric Sciences Research Center, University at Albany, NY, USA.
The Science of the total environment
|September 9, 2023
概括
气象因素显著影响大气中的细颗粒物 (PM2.5) 水平,影响空气质量政策. 考虑极端气候对于满足空气质量指南至关重要.
科学领域:
- 大气化学和物理大气化学和物理
- 气候科学 气候科学
- 环境健康 环境健康
背景情况:
- 大气中的细颗粒物 (PM2.5) 对人类健康构成重大风险.
- PM2.5度受到前体排放和气象条件的影响.
- 当前的PM2.5健康政策往往优先考虑减排,可能会忽视气象影响.
研究的目的:
- 调查气象参数在推动PM2.5年间变化 (IAV) 中的作用.
- 用气候模型模拟和重新分析数据对比气象学对PM2.5的影响与排放.
- 通过强调考虑极端气象现象的重要性,为空气质量政策提供信息.
主要方法:
- 采用了固定排放的社区地球系统模型 (CESM1) 的长期模拟.
- 分析了与湿度,降水和通风等气象参数相关的PM2.5年间变化 (IAV).
- 将模型衍生的PM2.5 IAV与MERRA-2再分析数据进行比较,其中包括排放和气象影响.
主要成果:
- 在东亚,CESM1模拟显示PM2.5 IAV为6.7%,主要是由气象变化驱动的.
- 由于厄尔尼诺引发的异常,中国东南部的电网电池PM2.5 IAV (高达12%) 较高.
- 气象变化对PM2.5 IAV的贡献更大,而不是主要排放源的偏远地区的排放变化.
结论:
- 气象因素是PM2.5年间变化的重要驱动因素,特别是在东亚等地区.
- 极端气候可能导致空气质量指南的暂时超越,即使长期手段符合.
- 旨在满足世卫组织指导方针的空气质量政策应考虑与极端气候有关的最高年度PM2.5度,而不仅仅是平均条件.
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