Anthropogenic sources and air mass transport affect spatial and seasonal variations of ambient halocarbons in southeastern China

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-05-03 DOI:10.1016/j.jes.2024.04.040
Zhaoyang Wu , Zhiwei Cao , Xinyi Huang , Yonglong Lu , Pei Wang , Zian Liang , Xupeng An
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Abstract

Halocarbons play a vital role in ozone depletion and global warming, and are regulated by the Montreal Protocol (MP) and its amendments. China has been identified as an important contributor to the halocarbon emissions, but the regional sources of halocarbons in China are not yet well comprehended. To investigate the characteristics, emissions, and source profiles, this study conducted a field campaign in Xiamen, a coastal city in southeastern China. Higher enhancements were found in the unregulated halocarbons (CH3Cl, CH2Cl2, CHCl3) than in the MP eliminated species (CCl4, CH3Br) and the MP controlled species (HCFCs, HFCs). Many of the measured halocarbons varied seasonally and regionally, depending on the anthropogenic sources and atmospheric transport. Backward trajectory analysis showed that the air masses from inland were polluted over Shandong, Hebei, and northern Fujian in the cold season, while the air masses from the sea in the warm season were clean. Different air masses in two seasons were associated with the halocarbon patterns in the study area. Industrial activities, especially solvent usage, were the primary sources of halocarbons. The emission hot spots in Fujian Province were concentrated in Sanming, Fuzhou, and Xiamen, and the unregulated halocarbons made the largest contribution. This study provides an insight for a deep understanding of the characteristics and potential sources of halocarbons, and for strengthened management of halocarbons in China.

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人为来源和气团输送影响中国东南部环境卤烃的空间和季节变化
卤烃在臭氧消耗和全球变暖中扮演着重要角色,受《蒙特利尔议定书》(MP)及其修正案的管制。中国已被确定为卤烃排放的重要贡献者,但对中国卤烃的区域来源还不甚了解。为了调查其特征、排放量和来源概况,本研究在中国东南部沿海城市厦门进行了实地考察。结果发现,未受管制的卤代碳化物(CH3Cl、CH2Cl2、CHCl3)比《蒙特利尔议定书》消除的物种(CCl4、CH3Br)和《蒙特利尔议定书》管制的物种(HCFCs、HFCs)中的卤代碳化物含量增加得更多。由于人为来源和大气迁移的不同,许多测量到的卤烃在季节和区域上都存在差异。后向轨迹分析表明,在寒冷季节,来自内陆的气团对山东、河北和福建北部造成了污染,而在温暖季节,来自海洋的气团则是清洁的。两个季节的不同气团与研究区域的卤烃模式有关。工业活动,尤其是溶剂的使用,是卤烃的主要来源。福建省的排放热点集中在三明、福州和厦门,而未受管制的卤烃贡献最大。这项研究为深入了解卤烃的特点和潜在来源、加强中国的卤烃管理提供了启示。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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