天津降水季节特征及不同气团来向离子来源分析

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Abstract Based on the atmospheric precipitation samples from March 2019 to February 2022 in Tianjin, the seasonal changes of precipitation and the sources of inorganic ions and organic acids were analyzed. The mean pH value of precipitation was 6.68, and the mean conductivity was 46.8μS/cm, and the mean value of total ion concentration was 726μeq/L. The precipitation ions generally showed the seasonal character of "high in winter and low in summer". SO₄^2- and NO₃^- accounted for 89.6% of total free acidity (TFA) and were the main acid causing ions. According to the HYSPLIT model, precipitation was mainly caused by five incoming air masses. In spring and winter, the main source was the high-ion-concentration air mass from northern and northwest areas. These two accounted for the largest proportion, which reached 60.0%~62.5%. In summer and autumn, the precipitation was mainly caused by the low-ion-concentration air mass from southern, eastern and southeast areas, the sum of which accounted for 60.0%~97.8%. Enrichment factor analysis showed that Ca²⁺, Mg²⁺ and K⁺ mainly came from soil, Cl^- mainly came from the ocean, Na⁺ came from sources included soil, while SO₄^2- and NO₃^- mainly came from anthropogenic sources. In addition, according to the sources of organic acids, direct sources, such as plant growth and soil release, had a greater contribution to the organic acid concentration in Tianjin, while indirect sources, such as atmospheric photochemical reaction of unsaturated hydrocarbons, had a smaller contribution. Positive matrix factorization (PMF) source analysis showed that the ion sources of atmospheric precipitation in Tianjin included biomass combustion, garbage incineration, secondary inorganic sources, biological emissions and secondary organic sources, sea and industrial sources, as well as land and fugitive dust.

Key words： precipitation inorganic ions organic acid back trajectory positive matrix factorization (PMF)

Received: 29 September 2022

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X131

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	YANG Jing-ai
	HAN Shao-qiang
	YANG Jian-an
	WANG Ji-lu
	LIU Jin-guan
	TIAN Yu
	ZHANG Ya-ni
	XUE Peng-fei
	WANG Yan-li
	ZHAO Zhi-qiang
	CHEN Chen
	CUI Lian-xi
	YANG Hua
	ZHANG Jing

Cite this article:

YANG Jing-ai,HAN Shao-qiang,YANG Jian-an等. Seasonal characteristics of precipitation in Tianjin and sources of ion from different air masses[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1844-1856.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1844

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