Seasonal characteristics of precipitation in Tianjin and sources of ion from different air masses
YANG Jing-ai1, HAN Shao-qiang1, YANG Jian-an2, WANG Ji-lu1, LIU Jin-guan1, TIAN Yu3, ZHANG Ya-ni1, XUE Peng-fei3, WANG Yan-li1, ZHAO Zhi-qiang3, CHEN Chen1, CUI Lian-xi1, YANG Hua1, ZHANG Jing3
1. Tianjin Eco-Environmental Monitoring Center, Tianjin 300191, China; 2. Tianjin Huanjian Environmental Testing Co., Ltd., Tianjin 300300, China; 3. Tianjin Tianbinruicheng Environmental Technology and Engineering Co., Ltd., Tianjin 300190, China
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". SO42- 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 SO42- 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.
杨璟爱, 韩少强, 杨健安, 王记鲁, 刘金冠, 田雨, 张亚尼, 薛鹏飞, 王艳丽, 赵志强, 陈晨, 崔连喜, 杨华, 张静. 天津降水季节特征及不同气团来向离子来源分析[J]. 中国环境科学, 2023, 43(4): 1844-1856.
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. Seasonal characteristics of precipitation in Tianjin and sources of ion from different air masses. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1844-1856.
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