• 关键词：各层通风量  通风量等级  逆温类型  逆温特征  空气质量  相关系数  四川盆地

• 基金项目：国家重点研发计划（No.2018YFC0214002）；四川省科技计划项目（No.2018JY0011，2018SZDZX0023）

• 杨旗
• 成都信息工程大学大气科学学院，成都 610225

• 向卫国
• 成都信息工程大学大气科学学院，成都 610225

• 陈志航
• 成都信息工程大学大气科学学院，成都 610225

• 杨显玉
• 成都信息工程大学大气科学学院，成都 610225

• 摘要：将四川盆地分为西部平原、中部丘陵和东部山地，采用2014—2020年的ERA5再分析资料、生态环保部官网18个站点的每日AQI监测数据，以及4个探空站的探空数据，利用相关系数和显著性检验的方法，讨论通风量及逆温对空气质量的影响.结果表明，四川盆地空气质量逐年变好，贴地层的通风量等级越大，空气质量越好.总的年均通风量呈先减少后增加的趋势，且越往上层波动越大.各层通风量与各项污染物浓度总体上呈现弱的负相关关系，与NO₂的负相关系数最大，与O₃的负相关系数最小.盆地大部分地区的贴地层通风量对污染物扩散的影响比低层通风量小.此外，四川盆地贴地逆温对空气质量的影响更显著.贴地逆温厚度、低层逆温强度8：00普遍大于20：00；而贴地逆温强度 8：00总体小于20：00，低层逆温厚度两时次相近.四川盆地AQI与逆温特征（层数、厚度和强度）在不同季节的正、负相关性不同，而逆温层数与AQI的相关系数通过90%显著性检验的频率最大.

• Abstract：Sichuan Basin is divided into western plain， central hill and eastern mountain. Based on the reanalysis data of ERA5 from 2014 to 2020， the daily AQI monitoring data of 18 stations on the official website of the Ministry of Ecology and Environment， and the radiosonde data of 4 radiosonde stations， the effects of ventilation conditions and temperature inversions on air quality over the Sichuan Basin are investigated by using correlation coefficient and significance test. The results show that the air quality of Sichuan Basin gradually improved during 2014—2020 and higher ventilation rates in the surface layer generally result in good air quality. Overall， the annual average ventilation rate showed a trend of first decreasing and then increasing with stronger fluctuation pattern in high levels. The ventilation rate in each layer presents a weak negative correlation with air pollutant levels. It is found a high degree of negative correlation between NO₂ and ventilation rates while the negative correction between ventilation rates and O₃ is relatively weak. The impact of ventilation rate in the surface layer on the dispersion of air pollutants is not as strong as the ventilation rates in low levels over most regions within the basin. In addition， the inverse layer occurred near the ground-level shows the most significant effects on air quality in Sichuan Basin. The thickness of the near ground-level inverse layer and the intensity of the low-level inversion at 8：00AM are generally greater than the conditions at 20：00PM while the intensity of near ground-level inverse layer at 8：00AM is weaker than the condition at 20：00PM. The thickness of the low-level inverse layer is roughly equivalent at 8：00AM and 20：00PM. The correlations between AQI and the inversion parameters （the number of layers， layer thickness and inversion intensity） in Sichuan Basin varied considerably in different seasons with the transition between positive and negative correlations， while the correlation coefficient between the number of inversion layers and AQI possess the highest frequency of passing the 90% significance test.

• Key words：ventilation capacity  ventilation level  inversion type  inversion characteristics  air quality  correlation coefficient  Sichuan Basin

• 
  摘要点击次数： 210 全文下载次数： 251