西安泾河国家基准气候站不同粒径大气颗粒物浓度变化特征

Variations in concentrations of different size fractions of atmospheric particulate matter from Jinghe National Climate Reference Observatory in Xi'an,China

以2009年为例,本文分析了西安泾河国家基准气候站的PM_(10)、PM_(2.5)和PM_1逐日质量浓度及年均日内小时浓度变化特征。PM_(10)、PM_(2.5)和PM_1的质量浓度年均值分别为105.4μg·m^(-3),75.8μg·m^(-3)和65.8μg·m^(-3),PM_(2.5)/PM_(10)为79.5%,充分说明了PM_(2.5)是构成PM_(10)的优势组分。在此基础上,进一步利用PM_(10-2.5)与PM_1的相关关系探讨了不同粒径大气颗粒物的来源。结果表明:大气粗颗粒物与超细颗粒物来源迥异,且在各季节具有不同的相关性。本研究为气象环保部门联合提升大气环境质量提供了初步的理论依据。

Daily and diurnal variations in mass concentrations of PM10, PM2s and PM1 from Jinghe National Climate Reference Observatory during 2009 were analyzed in this study. The mass concentrations for PM10, PM2.5 and PMI were 105.4μg·m-3, 75.8 μg·m-3 and 65.8 μg·m-3. The ratios of PM2.5 to PM10, with the average value 79. 5%, proved that PM25 played an important role in PMi0. The correlations between PM10-2.5 and PM1 were further discussed to explore seasonal variations of different size PM fractions and preliminarily inferred the sources of different size particles. All of the results could provide theoretical grounds to joint efforts by meteorological and environmental departments to improve atmospheric environmental conditions.