广州2017年1月一次严重灰霾过程的影响因素分析

Analysis of Influencing Factors During a Serious Haze Process in Guangzhou in January 2017

利用颗粒物监测资料、地面气象要素、风廓线和 micaps 天气形势资料对广州 2017 年 1 月 1 -6 日出现了严重的灰霾污染过程的影响因素进行了分析,初步探讨了此次灰霾污染过程的污染源、气象条件和垂直风场特征.结果表明院灰霾污染过程是自北向南发展的,过程污染最严重的是广州中部各区;污染过程的天气形势场稳定,地面风速较小,湿度较大,能见度与相对湿度的相关性高于与颗粒物质量浓度的相关系数,吸湿增长对大气能见度降低的贡献超过了颗粒物本身的消光作用;灰霾过程出现了双层逆温,2 km 以下的风速 ≤ 4 m/s,阻止了污染物向上的湍流扩散和水平输送;后向轨迹表明此次灰霾污染过程是本地污染源累积造成的,区域污染源输送对此次污染过程的贡献不大.

There were serious haze pollution process in Guangzhou from January1 to 6, 2017.This paper analyzed the influencefactors of the pollution process with particulate monitoring data, surface meteorological factors, wind profile and MICAPS weatherdata,Preliminary study on the source of pollution, weather conditions and vertical wind field characteristics of the haze pollutionprocess. The results show that the haze pollution process is the process of development from the north to the south, the most seriousprocess pollution is central Guangzhou, the weather situation is stable, surface wind speed is small, relativehumidity is high, thecorrelation of relative humidity and visibility is higher than the relationship with particle concentrations, the contribution ofhygroscopic growth to atmospheric visibility is more than the extinction of particles themselves. Haze process appeared doubleinversion, 2kmwind speed is less than or equal to 4m/s, these all prevent the upward turbulence diffusion and horizontal transport ofpollutants.The backward trajectory indicates that the haze pollution process is caused by the accumulation of local pollution sources,the transportationof other sources of pollutionhas little contributionto thepollutionprocess.