珠江三角洲风场对空气质量的影响

 利用2006-2008年珠江三角洲11个地面气象站逐日14:00风场资料与粤港珠三角区域空气监控网11个监测子站的区域空气质量指数（RAQI）数据，分析研究风场对空气质量的影响。结果表明: 珠江三角洲无论干湿季，北部、东部空气质量比南部、西部好，中部是空气质量较差的地区。区域污染输送对珠江三角洲空气质量有重要影响：区域平均风速大于2.6 m/s时不会出现区域性空气污染，区域平均风速大于3.2 m/s时空气非常清洁；区域平均风速小于1.8 m/s时区域空气污染严重；风速介于1.8~2.6 m/s时空气质量变化比较复杂。

Study of the Influence of Wind Field on Air Quality over the Pearl River Delta

Using daily data of wind speed and wind direction recorded at 14∶00 during 2006-2008 at 11 surface weather stations of the Pearl River Delta (PRD) and daily data of Regional Air Quality Index (RAQI) from 11 monitoring stations of the Hong Kong and Guangdong Pearl River Delta Air Quality Monitoring Network, the influence of wind field on air quality over the PRD were studied. Both in dry and wet seasons, the air quality of northern and eastern regions is better than that of southern and western regions of the PRD, and the air quality of central areas of the PRD is the worst. Regional transport has a great impact on the air quality of the PRD. When the regional mean wind speed (RMVS) is greater than 2.6 m/s, the air quality of the PRD is good. When RMVS is greater than 3.2 m/s, the air of PRD is very clean. When RMVS is less than 1.8 m/s, the air pollution of the PRD is serious. When RMVS is between 1.8 m/s and 2.6 m/s, the air quality of the PRD shows a complex change.