Dominant Contribution of Non-dust Primary Emissions and Secondary Processes to Dissolved Aerosol Iron

IF 10.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL 环境科学与技术 Pub Date : 2024-09-20 DOI:10.1021/acs.est.4c05816

Yizhu Chen, Zhenyu Wang, Zhengyang Fang, Chengpeng Huang, Han Xu, Huanhuan Zhang, Tianyu Zhang, Fu Wang, Lan Luo, Guoliang Shi, Xinming Wang, Mingjin Tang

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Abstract

Solubility largely determines the impacts of aerosol Fe on marine ecosystems and human health. Currently, modeling studies have large uncertainties in aerosol Fe solubility due to inadequate understanding of the sources of dissolved Fe. This work investigated seasonal variations of Fe solubility in coarse and fine aerosols in Qingdao, a coastal city in the Northwest Pacific, and utilized a receptor model for source apportionment of total and dissolved aerosol Fe. Desert dust was found to be the main source of total Fe, contributing 65 and 81% annually to total Fe in coarse and fine particles, respectively; in contrast, dissolved aerosol Fe originated primarily from combustion, industrial, and secondary sources. The annual average contributions to dissolved Fe in coarse and fine particles were 68 and 47% for the secondary source and 32 and 33% for the combustion source, respectively. Aerosol Fe solubility was found to be highest in summer and lowest in spring, showing seasonal patterns similar to those of aerosol acidity. Increase in Fe solubility in atmospheric particles, when compared to desert dust, was mainly caused by secondary processing and combustion emission, and the effect of secondary processes was dictated by aerosol acidity and liquid water content.

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非粉尘一次排放和二次过程对溶解气溶胶铁的主要贡献

溶解度在很大程度上决定了气溶胶铁对海洋生态系统和人类健康的影响。目前，由于对溶解铁的来源了解不足，模型研究在气溶胶铁溶解度方面存在很大的不确定性。这项研究调查了西北太平洋沿岸城市青岛粗粒和细粒气溶胶中铁溶解度的季节性变化，并利用受体模型对气溶胶总铁和溶解铁进行了来源分配。结果发现，沙漠尘埃是总铁的主要来源，每年分别占粗颗粒和细颗粒中总铁的 65% 和 81%；相比之下，溶解气溶胶中的铁主要来自燃烧、工业和二次来源。二次来源对粗颗粒和细颗粒中溶解铁的年平均贡献率分别为 68% 和 47%，燃烧来源为 32% 和 33%。研究发现，气溶胶中铁的溶解度夏季最高，春季最低，显示出与气溶胶酸度相似的季节性规律。与沙漠尘埃相比，大气颗粒物中铁溶解度的增加主要是由二次加工和燃烧排放引起的，而二次加工的影响受气溶胶酸度和液态水含量的决定。

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来源期刊

环境科学与技术环境科学-工程：环境

CiteScore

17.50

自引率

9.60%

发文量

12359

审稿时长

2.8 months

期刊介绍： Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.