荒漠草原无林地PM_(2.5) 、PM_(10) 时间变化特征及与气象因素的关系

Temporal Variation Characteristics of PM_(2.5)and PM_(10) in Non-woodland in Desert Steppe and Their Relationship with Meteorological Factors

选取荒漠草原无林地的PM_(2.5)、PM_(10)浓度以及气象因子数据,对颗粒物浓度的时间变化特征及其与气象因子的关系进行分析。结果表明:①1月的PM_(2.5)、PM_(10)月平均浓度最高,7月的PM_(2.5)与PM_(10)达到最低。季节尺度上PM_(2.5)、PM_(10)浓度变化为由大到小顺序依次为冬季>秋季>春季>夏季。②风速≤4.0 m/s时,随着风速增加,PM_(2.5)、PM_(10)浓度不断降低;当风速>4.0 m/s时,PM_(2.5)、PM_(10)浓度随风速增加而增加。PM_(2.5)、PM_(10)浓度与温度负相关。相对湿度≤50%时,随着相对湿度增加,PM_(2.5)、PM_(10)浓度呈增加趋势;相对湿度>50%时,随着空气湿度增加,PM_(2.5)、PM_(10)浓度呈降低趋势。随着大气气压上升,PM_(2.5)与PM_(10)浓度随之增加。③不同季节的气象因子对PM_(2.5)、PM_(10)影响存在差异。

The temporal variation characteristics of particulate matter concentration and the relationship between particulate matter concentration and meteorological factors were analyzed with the data of PM_(2.5),PM_(10)concentration and meteorological factors in non-woodland of desert steppe.The results showed that:①The monthly average concentration of PM_(2.5)and PM_(10)were both the highest in January,while those of PM_(2.5)and PM_(10)were both the lowest in July.On the seasonal scale,the concentration of PM_(2.5)and PM_(10)varied from large to small in the order of winter>autumn>spring>summer.②When the wind speed was≤4.0 m/s,the concentration of PM_(2.5)and PM_(10)decreased with the increase of wind speed,and when the wind speed was>4.0 m/s,the concentration of PM_(2.5)and PM_(10)increased with the increase of wind speed.The concentrations of PM_(2.5)and PM_(10)were negatively correlated with temperature.When the relative humidity was less than 50%,the concentration of PM_(2.5)and PM_(10)increased with the increase of relative humidity;when the relative humidity was more than 50%,the concentration of PM_(2.5)and PM_(10)decreased with the increase of air humidity.With the increase of atmospheric pressure,the concentration of PM_(2.5)and PM_(10)also increased.③There were differences in the effects of meteorological factors on PM_(2.5)and PM_(10)in different seasons.