气候变化领域集成服务门户(CCPortal): A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial-Hydrologic Systems Across the Third Pole Region

CCPortal

DOI	10.1029/2019JD031878
	A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial-Hydrologic Systems Across the Third Pole Region
	Lin M.; Hattori S.; Wang K.; Kang S.; Thiemens M.H.; Yoshida N.
发表日期	2020
ISSN	2169897X
卷号	125 期号:19
英文摘要	The Himalayas and Tibetan Plateau, identified as the Third Pole (TP), is a unique region because of its insertion into global environmental and climatic changes. Deposition of atmospheric nitrate in this region is one of the most important sources of reactive nitrogen to glacial-hydrologic system and ecosystems. The isotopic composition of atmospherically deposited nitrate preserved in ice bodies plays a central role in delineating environmental and climatic changes, present, and past. Here, we provide an overview of the complete isotopic compositions (δ15N, δ18O, and Δ17O) of nitrate in aerosol, snow, ice, and water samples (n = 46) collected across the Southern, Southeastern, Central, and Northern TP to constrain complex nitrogen cycles of the atmosphere, cryosphere, hydrosphere, and, potentially, the biosphere. A large variability of snow nitrate isotopic compositions is observed across the TP at different spatial scales (from a single glacier to the entire plateau), likely due to the complex landscape and relevant physical and chemical processes across the TP. Large nitrate Δ17O values are observed in water samples collected from the Mt. Everest region, highlighting the considerable fraction (up to 45%) of atmospheric nitrate to the nitrate load in this Himalayan hydrologic system. Our work reveals the complex chemical, depositional, and postdepositional processes over the TP that are greater than previously thought and identifies further comprehensive investigations, which entail using nitrate isotopic compositions as an identifier for nitrate source apportionment in various ecosystems and understanding past atmospheric and climatic conditions in this region. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	glacier melting; Himalayas; mass-independent fractionation; oxygen isotopic anomalies; photolysis; Tibetan Plateau
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
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/185726
作者单位	Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Yokohama, Japan; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, United States; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guangzhou, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou, China; University of CAS, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan
推荐引用方式 GB/T 7714	Lin M.,Hattori S.,Wang K.,et al. A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial-Hydrologic Systems Across the Third Pole Region[J]. 中国科学院西北生态环境资源研究院,2020,125(19).
APA	Lin M.,Hattori S.,Wang K.,Kang S.,Thiemens M.H.,&Yoshida N..(2020).A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial-Hydrologic Systems Across the Third Pole Region.Journal of Geophysical Research: Atmospheres,125(19).
MLA	Lin M.,et al."A Complete Isotope (δ15N, δ18O, Δ17O) Investigation of Atmospherically Deposited Nitrate in Glacial-Hydrologic Systems Across the Third Pole Region".Journal of Geophysical Research: Atmospheres 125.19(2020).