主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2023, Vol. 39 ›› Issue (6): 87-95.doi: 10.3969/j.issn.1673-503X.2023.06.011

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Characteristics and source analysis of PM2.5 chemical components at the Shangdianzi regional background station in North China in 2015

Xiaofang JIA1(),Yang LI1,*(),Xiaoqing SUN1,Fan DONG2   

  1. 1. Meteorological Observation Centre, China Meteorological Administration, Beijing 100081, China
    2. Environmental Meteorological Forecast Center of Beijing-Tianjin-Hebei, China Meteorological Administration, Beijing 100089, China
  • Received:2022-06-06 Online:2023-12-28 Published:2024-01-27
  • Contact: Yang LI E-mail:jiaxf@cma.gov.cn;liyang@cma.gov.cn

Abstract:

Based on the PM2.5 sample data collected from Shangdianzi regional atmospheric background station in 2015, the variation characteristics of PM2.5 mass concentration and its chemical components were analyzed, and its sources were traced by mass closure, backward trajectory, and potential source contribution methods. The results show that the annual average PM2.5 mass concentration at Shangdianzi station in 2015 was 44.9 μg·m-3, with average concentrations of 58.1 μg·m-3 in spring, 30.9 μg·m-3 in summer, 39.7 μg·m-3 in autumn, and 51.3 μg·m-3 in winter. Compared with 2009 to 2010, they decreased by 33%, 56%, 46%, and 9% respectively. The annual average mass concentrations of SO42-, NO3- and NH4+ are 8.5±9.2, 6.4±8.3, and 3.9±4.7 μg·m-3, respectively. The average annual concentrations of organic carbon and elemental carbon are 8.9±6.3 μg·m-3 and 1.6±1.2 μg·m-3, respectively. The daily average concentration ratio of NO3- to SO42- is 0.82, which is higher than the observed results in 2004, 2012 and 2013. The main components of PM2.5 are soil, organic matter, sulfates, and nitrates, accounting for 34%, 23%, 22%, and 15%, respectively. Compared with 2004, the proportion of sulfate in PM2.5 at Shangdianzi station has decreased, while the proportion of soil components has increased. The PM2.5 at Shangdianzi station primarily originates from the southern, northwestern, and northern of the station, and regional transmission from Hebei and Shandong provinces has a great impact on the high concentration of PM2.5 in Shangdianzi Station.

Key words: Aerosol, Chemical composition, Backward trajectory

CLC Number: