不同气象条件下北京市植被区与非植被区PM_(2.5)与臭氧(O_(3))的质量浓度及其相关性研究

The Concentration and Correlation of PM_(2.5) and O_(3) in Vegetation and Non-vegetation Areas of Beijing Under Different Meteorological Conditions

本研究利用2022年北京市植被区与非植被区监测点PM_(2.5)和O_(3)质量浓度数据以及气象数据,揭示气象因素对PM_(2.5)和O_(3)相关性的影响。结果表明,气象因素影响PM_(2.5)与O_(3)间相关性。全年以及不同季节中,温度对PM_(2.5)-O_(3)相关系数的影响作用最强。所有温度区间、湿度>55%、气压<985 hPa条件下的相关性表现为植被区高于非植被区。当温度<0℃或湿度>75%时,PM_(2.5)和O_(3)质量浓度负相关程度最高,温度>20℃或湿度<35%时,正相关程度最高。介于955~985 hPa气压范围的PM_(2.5)和O_(3)质量浓度呈正相关,低于或高于此范围二者呈负相关关系。其中955~970 hPa气压范围的正相关程度最强,高于985 hPa气压范围的负相关程度最强。高温、高湿的气象条件,PM_(2.5)和O_(3)质量浓度存在正效应;低温、低湿的气象条件,二者存在负效应。

This study utilized PM_(2.5) and O_(3) concentration data and meteorological data from monitoring points in both vegetation and non-vegetation areas of Beijing in 2022 to reveal the impact of meteorological factors on the correlation between PM_(2.5) and O_(3).The results showed that meteorological factors affected the correlation between PM_(2.5) and O_(3) in the study areas.In the whole year and different seasons,temperature had the strongest impact on PM_(2.5)-O_(3) correlation coefficient.Under meteorological conditions,i.e.,all temperature ranges,humidity lower than 55%,and atmospheric pressure lower than 985 hPa,the correlation between PM_(2.5)-O_(3) was higher in vegetation areas than in non-vegetation areas;when the temperature was lower than 0℃or the humidity was higher than 75%,the most significant and negative correlation between PM_(2.5) and O_(3) was observed;the correlation was the most significant and positive when the temperature was higher than 20℃or the humidity was lower than 35%.When the atmosphere pressure ranged from 955 to 985 hPa,the concentration of PM_(2.5) and O_(3) was positively correlated,and the concentration below or above this range,the correlation was negative,the positive correlation was the strongest in the 955-970 hPa pressure range,and the negative correlation was the strongest when the atoms pressure was higher than 985 hPa.Meteorological conditions of high temperature and humidity have positive effects on PM_(2.5) and O_(3) concentrations;low temperature and low humidity meteorological conditions have negative effects on both.