长三角沙尘中气溶胶粒径分布及化学组分特征

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Abstract

Based on the measurement data of PM, aerosol number concentration (10nm~10μm), water-soluble ions (WSIs) and meteorological elements, the characteristics of aerosol size distribution and chemical components during a long-range transport of dust pollution episode in the Yangtze River Delta were analyzed from May 3 to 8, 2017. The results showed that the PM concentration gradually decreased when the dust transmitted from north to south accompanying with the synoptic system, but the duration time of high PM concentrations increased to the contrary. The impact time of the dust was 38h in Hohhot and exceeded 60h in Nanjing. The spectral distribution of number concentration shifted to larger particles on dust days, peaking at 26nm and 33nm on non-dust and dust days, respectively. The aerosol surface area concentration had a trimodal distribution on non-dust days and exhibited four peaks on dust days. The WSI concentrations in PM_2.5 and PM₁₀ on dust days ranked in the order of Ca²⁺ > NH₄⁺ > SO₄^2- > NO₃^- > Mg²⁺ > Na⁺ > Cl^- > NO₂^- > K⁺>F^-, and NH₄⁺ > SO₄^2- > NO₃^- > Mg²⁺ > Ca²⁺ > Cl^- > NO₂^- > K⁺ > Na⁺ > F^- on non-dust days. The mass concentration of Ca²⁺ and Na⁺ in PM_2.5, PM₁₀ on dust days were 9.5, 13.7 and 4.4, 4.6times higher than those on non-dust days, respectively. The proportion of Ca²⁺ to the total WSIs in PM_2.5 and PM₁₀ was 24.7% and 24.9% on dust days, which was 4.9 and 5.7times higher than those on non-dust days. The proportion of NO₃^- in PM₁₀ on dust days (18.7%) was higher than that on non-dust days (13.9%); but was only 7.9% for that in PM_2.5 on dust days, which was lower than that on non-dust days (13.2%). The proportions of F^-, Cl^-, SO₄^2-, NH₄⁺ and K⁺ in PM_2.5 and PM₁₀ on dust days were uniformly lower than those on non-dust days.

Key words： the Yangtze River Delta dust aerosol size distribution water-soluble ions

Received: 13 November 2018

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X513

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	Articles by authors
	SHEN Li-juan
	SHI Shuang-shuang
	GUO Zhen-dong
	WANG Hong-lei
	LIU An-kang

Cite this article:

SHEN Li-juan,SHI Shuang-shuang,GUO Zhen-dong等. Characteristics of aerosol size distribution and chemical components during a dust pollution episode in the Yangtze River Delta[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2241-2248.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I6/2241

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