论文部分内容阅读
利用2015年安徽6个地级市的器测能见度、相对湿度、降水等资料,结合环保部门公布的逐时细颗粒物(PM2.5)质量浓度资料,通过对PM2.5质量浓度与相对湿度关系的分析,初步给出了四个霾的诊断方案,然后利用上述方案进行回算,探讨了基于逐时器测能见度资料确定霾天气的客观标准.结果表明,“排除降水,临界相对湿度(RHc)取90％,器测能见度不超过5km”作为小时霾的判据,6h连续为霾算作一个霾日,得到的霾日数较为合理且具有历史延续性.另外,根据该方案得到的各级霾天气也具有较好的空气质量指示意义,因此,该方案是可取的.“,”At present,auto-monitored visibility was adopted by more and more meteorological stations in China.At the same time,some weather phenomena were not recorded by observer any longer.It is necessary and urgent to set up a reasonable norm of haze identification using auto-monitored meteorological parameters,so that not only it contains information of air quality,maintains the continuity of annual haze days,but also the method is easy to put into application.In this paper,through summarizing of norms and some references related to haze identification,basic parameters were chosen for haze diagnosis.Based on analysis of relationship between PM2.5 concentration and relative humidity using hourly meteorological data at observatories of six cities in Anhui province,together with hourly PM2.5 concentrations published by environment department,four initial schemes were proposed,that are,auto-monitored visibility lower than 5 km,adopting critical relative humidity (RHc) as 90％ (or 95％),considering PM2.5 concentration or not.Then,hourly and daily hazes of 2015 were re-diagnosed for those cities based on those schemes.Some rules were considered in the investigation of objective standards for haze identification,e.g.,haze being indicator of air pollution,maintaining the continuity of annual haze days.The results indicated that hourly haze can be identified as “excepting hourly rainfall over 0.1 mm,the auto-monitored visibility no more than 5 km with the RH lower than 90％ (RHc =90％),neglecting PM2.5 concentration”.A day with consecutive 6 h haze can be defined as a haze day.The annual haze days obtained by this method were reasonable and a good indicator of air quality.