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DOI	10.1016/j.envint.2020.105614
	Isotopic evidence that recent agriculture overprints climate variability in nitrogen deposition to the Tibetan Plateau
	Li, Zhengjie; Hastings, Meredith G.; Walters, Wendell W.; Tian, Lide; Clemens, Steven C.; Song, Linlin; Shao, Lili; Fang, Yunting
通讯作者	Fang, YT (通讯作者)
发表日期	2020
ISSN	0160-4120
EISSN	1873-6750
卷号	138
英文摘要	The stable isotopes of nitrogen in nitrate archived in polar ice have been interpreted as reflecting a shift in reactive nitrogen sources or changes in atmospheric chemical reactivity. Here, we present a novel concentration and isotopic record of nitrate (delta N-15-NO3-) from a central Tibetan Plateau ice core over the last similar to 200 years. We find that nitrate concentration increased from 6.0 +/- 2.3 mu eq/L (mean +/- 1 sigma) in the preindustrial period (prior to 1900s) to 7.3 +/- 2.7 mu eq/L in post-1950. Over the same time period, the delta N-15-NO3- decreased from 8.7 +/- 3.7 parts per thousand to 4.2 +/- 3.1 parts per thousand, with much larger interannual variation in delta N-15-NO3- during the preindustrial period. We present a useful framework for quantifying the sensitivity of the isotopic composition of atmospheric nitrate to changes in both sources and chemistry (gas and aerosol phase). After 1950, nitrogen deposition is primarily driven by fertilizer use, leading to significant increases in concentration and decreases in delta N-15-NO3-. The large interannual variability of ice core delta N-15-NO3- in the preindustrial reflects natural processes, namely the El Nino Southern Oscillation (ENSO) and dust events. Our results highlight a new connection between the nitrogen cycle and ENSO, and the overprinting of natural climate signals by recent anthropogenic increases in reactive nitrogen release.
关键词	ICE-CORE ATMOSPHERIC NITRATE EL-NINO SNOW SOIL EMISSIONS NOX CHEMISTRY MONSOON MODEL
英文关键词	Ice core; Nitrogen stable isotope; Agriculture NOx emissions; Climate variability
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000522749900043
来源期刊	ENVIRONMENT INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260005
推荐引用方式 GB/T 7714	Li, Zhengjie,Hastings, Meredith G.,Walters, Wendell W.,et al. Isotopic evidence that recent agriculture overprints climate variability in nitrogen deposition to the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,138.
APA	Li, Zhengjie.,Hastings, Meredith G..,Walters, Wendell W..,Tian, Lide.,Clemens, Steven C..,...&Fang, Yunting.(2020).Isotopic evidence that recent agriculture overprints climate variability in nitrogen deposition to the Tibetan Plateau.ENVIRONMENT INTERNATIONAL,138.
MLA	Li, Zhengjie,et al."Isotopic evidence that recent agriculture overprints climate variability in nitrogen deposition to the Tibetan Plateau".ENVIRONMENT INTERNATIONAL 138(2020).