特定光源的光吸收和辐射效应减少,并且由于锁定而导致的迹象
Yao Qu1, Huikun Liu2, Ting Zhang2
1State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; National Observation and Research Station of Regional Ecological Environment Change and Comprehensive Management in the Guanzhong Plain, Shaanxi, Xi'an, 710499, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Journal of environmental management
|March 28, 2024
概括
在COVID-19封锁期间,减排显著降低了气溶光吸收和直接辐射效应. 交通排放量减少幅度最大,突出显示了特定源控制对大气条件的影响.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- COVID-19封锁为减排提供了一个独特的,大规模的实验.
- 了解特定来源的气溶影响对于气候和空气质量管理至关重要.
- 气溶光吸收和直接辐射效应 (DRE) 是气候强迫的关键参数.
研究的目的:
- 在COVID-19封锁期间和之后量化气溶光吸收 (babs) 和DRE的源特异变化.
- 调查减排对气溶光学特性和辐射效应的影响.
- 评估排放控制策略对大气辐射的有效性.
主要方法:
- 利用人工神经网络 (ANN) 来进行数据分析.
- 使用的来源分配环境受体模型.
- 分析了babs在370nm和880nm的变化,以及在不同时期的DRE.
主要成果:
- 所有排放源都显示下降babs;交通排放量减少了~90% (封锁),煤炭燃烧减少了~85% (封锁后).
- 在封锁期间燃烧煤炭/生物质的370nm升高的babs与增强的大气氧化有关.
- babs变化在880nm后锁定归因于氧化减弱和减少的二次前体.
结论:
- 在封锁期间,大规模的排放减少有效地降低了气溶光吸收和DRE (34-68%).
- 减少主要排放,就像交通一样,可以提高大气氧化和紫外线光吸收效率.
- 特定源排放控制产生各种辐射效应,为有效的气候减缓战略提供信息.
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