Xu, Haonan, Pang, Xiaobing, Chen, Danyun, Wei, Zhongjian, Lu, Yu, Huiyi, Yang and Yu, Lian (2025) Temporal Variations and Source Analysis of Ambient Carbonyls in Hangzhou: A City-Level Study in the Yangtze River Delta Region, China. Journal of Environmental Sciences (JES). ISSN 1001-0742 (Print), 1878-7320 (Online) (doi:10.1016/j.jes.2025.02.053)

PDF (Author's Accepted Manuscript) 50681 YANG_Temporal_Variations_And_Source_Analysis_Of_Ambient_Carbonyls_In_Hangzhou_(AAM)_2025.pdf - Accepted Version Restricted to Repository staff only until 29 March 2026. Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (1MB) | Request a copy

Abstract

Carbonyls play an important role in the atmospheric chemistry as the main precursor for reactive radicals and peroxyacetyl nitrate. However, little research has been conducted so far on the seasonal variations of carbonyls in China's urban atmosphere. In this study, ambient carbonyls were 24-hourly observed in four seasons in Hangzhou, a mega-city in the Yangtze River Delta Region, China. The concentration of total carbonyls was the highest in summer (44.35 μg/m3), the second in winter (44.05 μg/m3), the third in spring (29.31 μg/m3) and autumn (27.11 μg/m3). The most abundant species were found to be acetone in spring, summer, and winter, while formaldehyde in autumn. Rainfall can significantly reduce the concentrations of most ambient carbonyls, with the largest decrease observed in the wet precipitation events occurring in spring and summer, while acetone concentrations remained invariable due to its lower water solubility. Multiple linear regression analysis and carbonyls ratios indicated that anthropogenic emissions were the predominant sources of carbonyls, and atmospheric formaldehyde was mainly emitted from primary sources other than secondary sources. Vehicular exhaust was identified as the primary source of ambient carbonyls, particularly in winter, and its contribution reached 92.80% to formaldehyde. Additionally, photochemical reactions were closely associated with the secondary production of formaldehyde in summer. Carbonyls showed strong ozone formation potential in all four seasons. Based on the health risk assessment, the exposure to ambient carbonyls is harmful to outdoor pedestrians. The results could provide essential information and references for simulating regional air quality and analyzing ozone pollution, which is essential for improving air quality in the Yangtze River Delta region.

Item Type:	Article
Uncontrolled Keywords:	Carbonyls, seasonal variations, wet deposition, source analysis, Hangzhou
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences G Geography. Anthropology. Recreation > GF Human ecology. Anthropogeography Q Science > Q Science (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Centre for Society, Environment and Development (CSED) Faculty of Engineering & Science > Natural Resources Institute > Centre for Society, Environment and Development (CSED) > Climate Change
Last Modified:	11 Jun 2025 14:18
URI:	http://gala.gre.ac.uk/id/eprint/50681

Actions (login required)

View Item

Downloads