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土壤对反应性氧化的排放降低了中国人为源控制的有效性

Yurun Wang¹, Yanan Wang¹, Qinyi Li²

¹Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China.

Environmental science & technology

|November 15, 2024

概括

二氧化 (NO2) 污染在中国城市下降,但由于土壤排放量增加,农村地区的减少速度较慢. 这些不受管制的土壤排放部分抵消了空气质量改善,突出了需要新的控制策略.

科学领域:

环境科学环境科学
大气化学大气化学
空气质量管理管理空气质量

背景情况:

中国实施了清洁空气政策,导致2015-2023年期间在1200多个监测站点的二氧化 (NO2) 污染量显著减少.
大多数监测地点都在城市,由于观测数据有限,在农村地区了解NO2趋势方面存在不确定性.

研究的目的:

通过卫星测量,研究中国城市和农村地区的二氧化趋势的差异.
确定导致农村地区二氧化减少速度较慢的因素及其对空气质量政策的影响.

主要方法:

利用卫星测量分析2011-2023年中国城乡的二氧化柱趋势.
采用模型模拟,结合更新的土壤活性氧化 (Nr) 方案来评估排放影响.
将卫星数据与自下而上的排放清单和现场测量进行比较.

主要成果:

城市NO2柱在夏季每年下降4.0%,与其他数据来源一致.
农村NO2柱的减排速度较慢,每年从-2.6%到-0.0%不等.
增加的土壤Nr排放被确定为农村NO2缓慢减少的重要因素,部分抵消了减少污染的努力.

结论:

增加的土壤Nr排放量越来越重要,并可能抵消国家空气质量改善,特别是在农业密集的地区,如中国北方平原.
未来的空气质量政策必须解决这些不受管制的土壤排放,以有效降低NO2,臭氧和颗粒酸盐水平.

关键词:

空气质量空气质量是什么长期趋势长期趋势模型模拟模型模拟模型模拟卫星检索卫星检索土壤反应性气排放量

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