| 摘要: |
| 为了解成都市PM2.5污染特征及其与地面气象要素的关系，利用环境空气质量监测资料和地面气象观测资料，分析了PM2.5质量浓度的季节、月和日变化特征，并分不同空气质量等级分析空气质量与地面气象要素的关系。结果表明：PM2.5质量浓度具有明显的季节、月和日变化特征，且成都市区6个监测站的变化趋势比较一致；成都市相对湿度较大，地面风速较小，约62%的样本分布在相对湿度80%~100%，约85%的样本分布在地面风速0~2 m·s-1，地面风速对成都市PM2.5的水平输送、扩散、稀释不利；降水对PM2.5的清除量随PM2.5初始浓度、降雨持续时间和累积降雨量增加而增大。 |
| 关键词: 成都市；PM2.5；地面气象要素；空气质量等级 |
| DOI： |
| 投稿时间：2019-08-23 |
| 基金项目:高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目（SCQXKJQN2019021）：基于神经网络的空气质量预报优化方法研究 |
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| Characteristics of PM2.5 and Its Relationship with Ground Meteorological Elements in Chengdu |
| CAO Yang,WANG Chenxi,ZHAO Xiaoli,LIU Weihua |
| (Sichuan Meteorological Disasters Prevention Technology Center, Chengdu 610072 , China ;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072 , China) |
| Abstract: |
| The air-quality data and ground meteorological data were adopted to analyze the pollution characteristics of PM2.5 in Chengdu and its relationship with ground meteorological elements in seasonal, monthly and daily variation. The result shows that the PM2.5 concentration differs in seasonal, monthly and diurnal variation, and the variation trend of six (6) monitoring stations is consistent. About 62% of the PM2.5 is distributed in a humidity range of 80~100%, and about 85% of it is in a wind speed of 0~2 m·s-1. The ground wind speed is unfavorable to the horizontal transport, diffusion and dilution of PM2.5 in Chengdu. The precipitation removal of PM2.5 is increasing as its original concentration become larger, and cumulative rainfall duration become longer. |
| Key words: Chengdu；PM2.5；ground meteorological elements；air quality level |
