Chemical Characteristics and Source Apportionment of Water-Soluble Ions in Atmosphere Aerosols over the East China Sea Island in Winter and Summer

FANG Yan 1,2 CAO Fang1,2 FAN Mei-yi1,2 ZHANG Yan-lin1,2

(1.Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), School of Applied Meteorology, Nanjing University of Information Science & Technology , Nanjing, China 210044)
(2.Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology , Nanjing, China 210044)

【Abstract】A total of 70 total suspended particulate (TSP) samples were collected from December 2017 to February 2018 and June to August 2018 in Shengsi Islands, East China Sea. In this study, the mass concentrations of water-soluble ions in the TSP (including Na+, K+, NH4+, Mg2+, Ca2+, Cl, SO42, NO3, and MSA) samples were determined by ion chromatography. The chemical characteristics, seasonal differences, and main sources of water-soluble ions in this background aerosol site were investigated by a multiple-technique analysis combining an HYSPLIT model, correlation analysis of water-soluble ions, and primary component analysis. The results showed that the average mass concentrations of TSP and the main water-soluble inorganic ions (WSIIs) were both high in winter and low in summer; the average mass concentration of total water-soluble inorganic ions (TWSIIs) in winter was (26.5 ± 16.3) μg·m–3 and in summer was (8.8 ± 3.8) μg·m–3. Secondary inorganic ions (NO3, SO42, and NH4+) are the most important ionic components in TSP, which accounted for 86.2% and 74.9% of TWSIIs in winter and summer, respectively. Meanwhile, the study site was affected by seasonal temperature change, long-distance transmission, and summer biogenic sulfates. The mass concentration of nitrate was highest in winter, and that of sulfate was highest in summer. Anthropogenic sources were the main source of nss-SO42in atmospheric aerosols. The analysis of sulfate sources showed that the contributions of biogenic sulfates to nss-SO42were 28.1% and 5.9% in summer and winter, respectively. The results of the principal component analysis (PCA) indicated that the main sources of aerosol chemical composition were marine and anthropogenic sources in summer and winter, respectively. In winter, Clshowed a certain degree of enrichment due to the influence of human activities, and the average value of the enrichment factor was 38.5%.

【Keywords】 East China Sea ; background aerosol site; total suspended particulate (TSP) ; water-soluble ions ; non-sea-salt sulfates;

【DOI】

【Funds】 National Natural Science Foundation of China (41977185, 41761144056) Outstanding Youth Fund Project of Jiangsu Natural Science Foundation (BK20180040)

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(Translated by PU H)

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This Article

ISSN:0250-3301

CN:11-1895/X

Vol 41, No. 03, Pages 1025-1035

March 2020

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Abstract

  • 1 Materials and methods
  • 2 Results and discussion
  • 3 Conclusions
  • References