| 摘要: |
| 基于2019年4月-2023年3月采暖期与非采暖期大连市国家级空气监测站、国家基本气象站和GDAS数据,对比分析2019-2022年大连市采暖期与非采暖期PM2.5污染特征,并利用气团后向轨迹聚类分析方法、PSCF和CWT对气团传输轨迹和大气污染物潜在源区进行了统计分析。研究表明:采暖期PM2.5浓度高于非采暖期,2021年降低,2022年升高。采暖期PM2.5污染率是非采暖期的3.2~15.6倍,采暖期PM2.5污染率2020年最高、2022年最低,采暖期PM2.5重污染率2022年最高、2021年最低。采暖期与非采暖期PM2.5质量浓度和污染率日变化均呈现双峰型。重污染率夜间高、无明显双峰型。采暖期与非采暖期PM2.5浓度与气象参数相关关系有所不同。采暖期WPSCF值明显高于非采暖期,有3个污染潜在源区:西南方向、偏北方向、偏东方向。非采暖期有1个污染潜在源区在西南向。CWT分析结果与PSCF分析基本一致,西南方向为影响大连市空气质量的主要污染潜在源区。 |
| 关键词: 采暖期 PM2.5 潜在源区贡献分析方法(PSCF) 浓度权重轨迹分析方法(CWT) |
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| Analysis of PM2.5 Pollution Characteristics and Potential Source Areas of Air Pollution during Heating Period in Dalian City |
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| Abstract: |
| Based on the data from the national air monitoring station, the basic meteorological station in Dalian and GDAS from the heating and non-heating periods from April 2019 to March 2023, a comparative analysis of the PM2.5 pollution characteristics in Dalian during the heating and non-heating periods from 2019 to 2022 was conducted. The statistical analysis of air transport trajectories and potential sources of air pollutants was performed using backward trajectory cluster analysis methods, PSCF and CWT analysis methods. The study indicated: the PM2.5 concentration during the heating period was higher than the non-heating period, dropped in 2021 and increased in 2022. The pollution rate of PM2.5 during the heating period was 3.2~15.6 times that of the non-heating period, with the highest rate in 2020 and the lowest in 2022. The heavy PM2.5 pollution rate in 2022 was the highest, with the lowest in 2021. Both the mass concentration of PM2.5 and the pollution rate showed a bimodal diurnal variation during heating and non-heating periods.The heavy pollution rate was higher at night and there was no obvious bimodal pattern. The correlations between PM2.5 concentration and meteorological parameters were different during heating and non-heating periods.WPSCF in heating period was significantly higher than that in non-heating period. There were three potential pollution sources: southwest, north and east. In the non-heating period, there was one potential source of pollution in the southwest direction.The CWT analysis results were basically consistent with the PSCF. The southwest direction iwas consistently the main potential pollution source area affecting the air quality in Dalian. |
| Key words: Heating period PM2.5 PSCF CWT |
