Hygroscopic properties of the ambient aerosols observed in winter in Beijing

doi:10.7523/j.issn.2095-6134.2014.03.005

Abstract

Abstract:

By using HTDMA (hygroscopic tandem differential mobility analyzer) system, hygroscopicity of ambient aerosols was observed during 8-20 December 2009 in Beijing. It was found that the aerosol hygroscopic growth factor value varied between 1.01 and 1.40 in winter, showing weak hygroscopicity and nearly hydrophobicity. Daily variation of aerosol growth factor showed a bimodal mode (two peaks at midnight and noon and two valleys in the morning and evening rush hour) or a single-peak mode (a peak at midnight and a valley at noon). One of the major factors influencing aerosol hygroscopicity was the content of weak hygroscopic and nearly hydrophobic components in the ambient aerosol.

Key words: field observation, aerosols, hygroscopic properties, Beijing

CLC Number:

X513

WANG Xuan, CHEN Jianhua, GENG Chunmei, REN Lihong, CHEN Jianmin, YE Xingnan, YANG Wen. Hygroscopic properties of the ambient aerosols observed in winter in Beijing[J]. , 2014, 31(3): 322-328.

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