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五台山春季气溶胶传输特征
Aerosol transmission characteristics of spring in Wutai mountain
基于气溶胶监测仪Grimm180观测的2018年3~5月山西省五台山气溶胶数浓度和质量浓度数据，以及对应时段的美国国家环境预报中心（NCEP）提供的全球资料同化系统（GDAS）数据，利用聚类分析和潜在源贡献因子分析（PSCF）等方法，研究五台山春季气溶胶数浓度和质量浓度的统计特征，分析影响五台山气溶胶浓度变化的主要传输路径，以及潜在的贡献源区.结果表明，影响春季五台山气溶胶变化的主要传输路径有6类，其中，第1，4，2，5类传输路径均为西北和偏西方向，占总轨迹62.5%，而第3，6类传输路径则为偏南和偏东方向，占总轨迹的24.7%.对不同传输路径进行统计分析，发现第1，4类传输路径对粗粒径PN10、PN>10数浓度和PM10质量浓度影响最大，其潜在贡献源区主要位于内蒙古西部和陕北黄土高原一带，PSCF值在局部地区达到了0.6以上.第6，3类路径对细粒径的数浓度PN0.5、PN1.0和PM1.0质量浓度影响较大，其潜在贡献源区主要位于山西中南部、陕西中部、京津冀地区中部以及河南北部区域，部分地区PSCF值达到0.8以上.细粒径的PSCF高值区主要位于五台山的偏东和偏南方向，传输高度在2km以下.随着粒径的增加，PSCF高值区变为西北和东南方向，传输高度到达了自由对流层2~4km，且通过西北地区自由对流层的输送占比逐渐增大，PSCF高值区距离五台山站也越来越远.
Statistical characteristics of spring aerosol particle concentration and mass concentration over the Wutai mountain in Shanxi province based upon the particle concentration and mass concentration data observed by Grimm180 aerosol instrument over the Wutai mountain in Shanxi province. The Global Data Assimilation System (GDAS) data provided by the National Environmental Prediction Center (NCEP) from March to May 2018, cluster analysis and potential source contribution factor analysis (PSCF) were also utilized to reveal the main transmission path affecting the aerosol concentration variation, as well as the potential contribution source area. There were mainly 6 types of transmission routes affecting the aerosol concentration over the Wutai mountain in spring, of which the first, fourth, second and fifth were northwestern and westward, accounting for 62.5% of the total trajectory; while the third and sixth type were in the southern and eastern directions, accounting for 24.7% of the total trajectory. The statistical analysis of different transmission paths showed that the first and fourth types had the greatest influence on the concentration of PN10, PN>10 and PM10, whose potential contribution source areas were mainly located in western Inner Mongolia and the Loess Plateau in northern Shaanxi Province, in which the PSCF values reached 0.6 or more; whereas the sixth and third type of routes had a larger impact on the PN0.5, PN1.0, and PM1.0 concentration, of which the potential contribution source areas were mainly within the south-central and central Shaanxi Province, Beijing-Tianjin-Hebei region and northern Henan Province, in which the PSCF values were above 0.8. The high-value zone of fine particle PSCF was mainly located in the eastern and southern region around the Wutai mountain with the transmission height lowering than 2km. As the particle size increased, the high-value zone of PSCF became the northwestern and southeastern region, and the transmission height was within 2~4km of the free troposphere, through which the proportion of transportation at northwestern region increased gradually, and the high-value zone got farther and farther away from Wutai mountain station.
aerosol / particle size / spring / transmission / Wutai mountain
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山西省自然基金资助（201601D011084）；山西省青年基金资助（201801D221333，201801D221334）；山西省气象局重点项目资助（SXKZDDQ20185105）；山西省气象局青年基金资助（SXKQNDW20205241）
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