气候变化领域集成服务门户(CCPortal): Aged polycyclic aromatic hydrocarbons as stratigraphic marker in the Anthropocene: Evidence from Tibetan Lake sediments

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DOI	10.1016/j.watres.2023.120652
	Aged polycyclic aromatic hydrocarbons as stratigraphic marker in the Anthropocene: Evidence from Tibetan Lake sediments
	Li, Jun; Chang, Ruwen; Ban, Xiyu; Yuan, Guo-Li; Du, Xinyu; Yin, Ge; Lin, Tian
发表日期	2023
ISSN	0043-1354
EISSN	1879-2448
卷号	245
英文摘要	Polycyclic aromatic hydrocarbons (PAHs) were supposed to serve as combustion marker reflecting the past energy use, but it was unclear whether their sediment records in the Anthropocene were weathered due to aging-induced formation of bound residues. In this study, the total concentration of PAHs (the sum of rapid desorption, slow desorption, and bound residue fractions) were determined in four dated sediment cores from eastern to central Tibet using multi-step sequential extraction method. The total 16 PAH concentrations were 11.8, 13.5, 18.9, and 29.4 ng/g dw (in average) in the Co Ngoin, Pung Co, Ahung Co, and Putok lakes, respectively. The stratigraphic records and estimated source contributions of PAHs in different areas of Tibet exhibited a coherent change in the mid-20th century in response to the Holocene-Anthropocene transition. The sediment PAHs also displayed a comparable pattern when the bound residue fraction was not accounted for, suggesting their effective retainability under natural aging conditions. This may be elucidated by the enduring forward and back conversions between slow desorption and bound residue fractions, which manifested similar time-dependent variations across PAH congeners. The distinct conversion tendencies of different congeners were predicted by the binding affinity of congeners to surface/inner regions of organic matter using molecular docking simulations. Our findings demonstrate the persistence of sediment PAH records under natural aging and validate the use of PAH documentary evidence for investigating the Anthropocene.
关键词	Sediment record Tibetan Plateau Aging-induced transformation Bound residue fraction Combustion marker
英文关键词	ORGANIC-MATTER; PAHS; BIOAVAILABILITY; CONTAMINANTS; COMBUSTION; POLLUTANTS; POLLUTION; RESIDUES; RECORD; CHINA
WOS研究方向	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:001083360700001
来源期刊	WATER RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283574
作者单位	China University of Geosciences - Beijing; China University of Geosciences - Beijing; Shanghai Ocean University
推荐引用方式 GB/T 7714	Li, Jun,Chang, Ruwen,Ban, Xiyu,et al. Aged polycyclic aromatic hydrocarbons as stratigraphic marker in the Anthropocene: Evidence from Tibetan Lake sediments[J],2023,245.
APA	Li, Jun.,Chang, Ruwen.,Ban, Xiyu.,Yuan, Guo-Li.,Du, Xinyu.,...&Lin, Tian.(2023).Aged polycyclic aromatic hydrocarbons as stratigraphic marker in the Anthropocene: Evidence from Tibetan Lake sediments.WATER RESEARCH,245.
MLA	Li, Jun,et al."Aged polycyclic aromatic hydrocarbons as stratigraphic marker in the Anthropocene: Evidence from Tibetan Lake sediments".WATER RESEARCH 245(2023).