Characterization of summer PM2.5 aerosols from four forest areas in Sichuan, SW China--颗粒学报PARTICUOLOGY

Mo, H., Li, L., Lai, W., Zhao, M., Pu, J., Zhou, Y., & Deng, S. (2015). Characterization of summer PM2.5 aerosols from four forest areas in Sichuan, SW China. Particuology, 20, 94–103. https://doi.org/10.1016/j.partic.2014.10.009

Characterization of summer PM_2.5 aerosols from four forest areas in Sichuan, SW China

Hengqin Mo ^a, Li Li ^a *, Wei Lai ^a, Min Zhao ^b, Jinguo Pu ^a, Yi Zhou ^a, Shihuai Deng ^a

a Rural Environment Protection Engineering & Technology Center of Sichuan Province, College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China
b Meishan Environmental Monitoring Center, Meishan 620020, China

10.1016/j.partic.2014.10.009

Volume 20, June 2015, Pages 94-103

Received 23 June 2014, Revised 14 October 2014, Accepted 23 October 2014, Available online 17 February 2015.

E-mail: lili@sicau.edu.cn; lili_sicau@163.com

Highlights

• Summer PM_2.5 aerosol samples were collected in four forest areas in Sichuan, SW China.

• Chemical compositions and mass closures for PM_2.5 aerosols were analyzed.

• PM_2.5 aerosols for the forests in Sichuan consisted of high fractions of crustal and organic matters.

• The reconstructed mass accounts for 75.9–102.0% of measured PM mass for the four forest areas.

Abstract

Aerosol samples were collected over 24 and 12 h to represent day/night aerosol characteristics in forest areas at Ya’an Baima Spring Scenic Area (BM), Panzhihua Cycas National Nature Reserve (PZ), Gongga Mountain National Nature Reserve (GG), and Wolong National Nature Reserve (WL), during the summers of 2010–2012. Mass and chemical component concentrations, including organic carbon, elemental carbon, and inorganic ions (F⁻, Cl⁻, NO₂⁻, NO₃⁻, SO₄²⁻, C₂O₄²⁻, PO₄³⁻, K⁺, Na⁺, Ca²⁺, Mg²⁺, and NH₄⁺), of PM_2.5 aerosols were measured. The average PM_2.5concentrations for 24 h were 72.42, 104.89, 20.55, and 29.19 μg/m³ at BM, PZ, GG, and WL, respectively. Organic matter accounted for 38.0–49.3%, while elemental carbon accounted for 2.0–5.7% of PM_2.5 mass. The sum concentrations of SO₄²⁻, NH₄⁺, and NO₃⁻ accounted for 23.0%, 17.4%, 22.1%, and 30.5% of PM2.5 mass at BM, PZ, GG, and WL, respectively. Soil dust was also an important source of PM_2.5, accounting for 6.3%, 17.0%, 10.4%, and 19.1% of PM_2.5mass at BM, PZ, GG, and WL, respectively. These reconstructed masses accounted for 75.9–102.0% of PM_2.5 mass from the four forest areas of SW China.

Graphical abstract

Keywords

PM2.5; Forest areas; Mass closure; Southwest China

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