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DOI	10.1016/j.atmosenv.2020.117769
	Variation in quantity and quality of rainwater dissolved organic matter (DOM) in a peri-urban region: Implications for the effect of seasonal patterns on DOM fates
	Li S.; Fan R.; Luo D.; Xue Q.; Li L.; Yu X.; Huang T.; Yang H.; Huang C.
发表日期	2020
ISSN	1352-2310
卷号	239
英文摘要	Dissolved organic matter (DOM) is a ubiquitous group of organic compounds in rainwater that plays vital roles in the biogeochemical cycle. However, little is known about its chemical composition, optical characterization, potential sources, and controlling mechanisms in peri-urban atmospheric rainwater. One-year rainfall samples were collected between September 2018 and August 2019 in a Nanjing suburb. Stoichiometric, ultraviolet–visible (UV–Vis) absorption, and three-dimensional fluorescence excitation-emission matrix (EEM) with parallel factor analysis (PARAFAC) analyses were utilized to characterize DOM. Several proxies for DOM concentration, including dissolved organic carbon (DOC), dissolved organic nitrogen (DON), and absorption coefficient (a254), exhibited power-function relationships with the rainfall amount (r2 = 0.33–0.55, p < 0.001). Particularly, the DOC and a254 value showed significant seasonal variability, with lower value in two wet seasons (winter and summer) than in the dry seasons (autumn and spring). The annual wet depositional (WD) flux of DOC in the Xianlin (XL) site was calculated as 1.68 g C m−2 yr−1, agreeing with the range of global WD flux values. Two terrestrial humic-like components (C1–C2), one microbial humic-like component (C3), and one tryptophan-like component (C4) were identified by EEM-PARAFAC in rainwater DOM. The results of the specific absorption indices (SUVA254, SR) and PARAFAC component analyses revealed that summer DOM samples had lower fluorescence intensities, aromatic contents, and molecular sizes. Principal component analysis (PCA) based on DOM indices showed that rainwater DOM had predominantly terrestrial humic origins, while this characteristic became slightly weaker in summer. The quantity and quality of rainwater DOM were closely related to meteorological variables (i.e., air mass, rainfall amount, and solar radiation) as well as anthropogenic activities. This study could improve the understanding of the quantity and quality of rainwater DOM on carbon budgets and biogeochemical cycling from some new insights of optical proxies about different fates of rainwater DOM under complex controlling mechanisms. © 2020 Elsevier Ltd
关键词	Dissolved organic matter Parallel factor analysis Seasonal rainwater Three-dimensional fluorescence matrix UV absorption spectrum
语种	英语
scopus关键词	Amino acids; Biogeochemistry; Budget control; Dissolution; Fluorescence; Organic carbon; Rain; Dissolved organic carbon; Dissolved organic matters; Dissolved organic nitrogen; Fluorescence intensities; Meteorological variables; Optical characterization; Parallel factor analysis; Three-dimensional fluorescences; Quality control; ammonia; aromatic compound; dissolved organic matter; nitrate; nitrogen; organic carbon; organic nitrogen; rain; tryptophan; absorption; chemical composition; dissolved organic matter; factor analysis; human activity; humic substance; periurban area; principal component analysis; qualitative analysis; quantitative analysis; rainfall; rainwater; seasonal variation; ultraviolet radiation; visible spectrum; absorption spectroscopy; Article; atmospheric deposition; autumn; biogeochemical cycling; China; concentration (parameter); dry season; fluorescence; humification; molecular size; parallel factor analysis; principal component analysis; priority journal; qualitative analysis; quantitative analysis; rainy season; seasonal variation; spring; stoichiometry; suburban area; summer; ultraviolet visible spectroscopy; winter; China; Nanjiang; Sichuan
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248995
作者单位	School of Geography, Nanjing Normal University, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, 210023, China; Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Ministry of Education, Nanjing, 210023, China; State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing, 210023, China
推荐引用方式 GB/T 7714	Li S.,Fan R.,Luo D.,et al. Variation in quantity and quality of rainwater dissolved organic matter (DOM) in a peri-urban region: Implications for the effect of seasonal patterns on DOM fates[J],2020,239.
APA	Li S..,Fan R..,Luo D..,Xue Q..,Li L..,...&Huang C..(2020).Variation in quantity and quality of rainwater dissolved organic matter (DOM) in a peri-urban region: Implications for the effect of seasonal patterns on DOM fates.ATMOSPHERIC ENVIRONMENT,239.
MLA	Li S.,et al."Variation in quantity and quality of rainwater dissolved organic matter (DOM) in a peri-urban region: Implications for the effect of seasonal patterns on DOM fates".ATMOSPHERIC ENVIRONMENT 239(2020).