摘要
利用2007年6月至2009年11月丹东市区器测能见度资料和人工观测能见度资料,分析目测能见度与器测能见度的关系,探讨不同季节中,PM10和PM2.5、PM1.0颗粒物浓度对大气能见度的影响,研究降水强度与PM的湿清除效率关系。结果表明:在低能见度情况下,目测能见度与器测能见度的比值相对较小;能见度较差时,PM10粒子比重增大,PM1.0/PM10和PM2.5/PM10比值与月平均风速为负相关;天气现象日数较多的月份,其对应的月平均能见度较小;PM日平均质量浓度的改变量以及降雨量对PM的湿清除效率与降水强度相关,器测目测能见度平均值随着降水强度的增加而降低。
Based on the visibility data from the instrumental observation and manual observation from June 2007 to November 2009 in Dandong,relationship between these two records was analyzed. The effects of particle concen- trations such as PM_1.0, PM_2. 5 and PM_1.0 in the different seasons on the visibility were discussed. The relationship between precipitation intensity and wet removal efficiency of PM was analyzed. The results indicate that the visibility ratio between visual measurement and instrumental measurement is small under the low visibility condition. The proportion of PM_1.0 is larger when the visibility is poor, and the mean monthly wind speed is in the negative correlations with the values of PM_1.0/PM_1.0 and PM_2. 5/PM_10. The more the weather phenomena are in a month, the poorer the relatively mean monthly visibility is. The change of mean daily mass concentration of PM and the wet removal efficiency of PM to precipitation are related to precipitation intensity. The average visibility values from both visual measurement and instrumental measurement decrease with the increasing of precipitation intensity.
出处
《气象与环境学报》
2011年第6期7-13,共7页
Journal of Meteorology and Environment
基金
中国气象局沈阳大气环境研究所项目"大气能见度器测和目测的比较"资助
