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| Aerosol transmission characteristics of spring in Wutai mountain |
| YAN Shi-ming1, WANG Yan1, ZHANG Yue-jun1, GAO Xing-ai1, WANG Shu-min1, DONG Jian2, LIU Zheng-dong2 |
1. Shanxi Institute of Meteorological Sciences, Taiyuan 030002, China;
2. Wutai Mountain Meteorological Station, Xinzhou 035515, China |
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Abstract 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.
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Received: 19 July 2019
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