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DOI	10.1073/pnas.1801935115
	Atmospheric sulfur isotopic anomalies recorded at Mt. Everest across the Anthropocene
	Lin, Mang; Kang, Shichang; Shaheen, Robina; Li, Chaoliu; Hsu, Shih-Chieh; Thiemens, Mark H.
发表日期	2018
ISSN	0027-8424
卷号	115 期号:27
英文摘要	Increased anthropogenic-induced aerosol concentrations over the Himalayas and Tibetan Plateau have affected regional climate, accelerated snow/glacier melting, and influenced water supply and quality in Asia. Although sulfate is a predominant chemical component in aerosols and the hydrosphere, the contributions from different sources remain contentious. Here, we report multiple sulfur isotope composition of sedimentary sulfates from a remote freshwater alpine lake near Mount Everest to reconstruct a two-century record of the atmospheric sulfur cycle. The sulfur isotopic anomaly is utilized as a probe for sulfur source apportionment and chemical transformation history. The nineteenthcentury record displays a distinct sulfur isotopic signature compared with the twentieth-century record when sulfate concentrations increased. Along with other elemental measurements, the isotopic proxy suggests that the increased trend of sulfate is mainly attributed to enhancements of dust-associated sulfate aerosols and climate-induced weathering/erosion, which overprinted sulfur isotopic anomalies originating from other sources (e.g., sulfates produced in the stratosphere by photolytic oxidation processes and/or emitted from combustion) as observed in most modern tropospheric aerosols. The changes in sulfur cycling reported in this study have implications for better quantification of radiative forcing and snow/glacier melting at this climatically sensitive region and potentially other temperate glacial hydrological systems. Additionally, the unique Delta S-33-delta S-34 pattern in the nineteenth century, a period with extensive global biomass burning, is similar to the Paleoarchean (3.6-3.2 Ga) barite record, potentially providing a deeper insight into sulfur photochemical/thermal reactions and possible volcanic influences on the Earth's earliest sulfur cycle.
关键词	Himalayas mass-independent fractionation aerosol glacier Archean
学科领域	Science & Technology - Other Topics
语种	英语
WOS研究方向	Multidisciplinary Sciences
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111956
作者单位	Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
推荐引用方式 GB/T 7714	Lin, Mang,Kang, Shichang,Shaheen, Robina,et al. Atmospheric sulfur isotopic anomalies recorded at Mt. Everest across the Anthropocene[J]. 中国科学院西北生态环境资源研究院,2018,115(27).
APA	Lin, Mang,Kang, Shichang,Shaheen, Robina,Li, Chaoliu,Hsu, Shih-Chieh,&Thiemens, Mark H..(2018).Atmospheric sulfur isotopic anomalies recorded at Mt. Everest across the Anthropocene.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(27).
MLA	Lin, Mang,et al."Atmospheric sulfur isotopic anomalies recorded at Mt. Everest across the Anthropocene".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.27(2018).