Who controls the monthly variations of NH4+ nitrogen isotope composition in precipitation?

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	Who controls the monthly variations of NH4+ nitrogen isotope composition in precipitation?
	Ai-min Long; Yan-Li Wang; Hong-Wei Xiao; Hua-Yun Xiao
刊名	Atmospheric Environment
	2012
卷号	54 期号:1 页码:201-206
关键词	Ammoniumδ15 Nisotopic Fractionation Unidirectional Reaction Exchange Reaction Seasonal Variation
英文摘要	Nitrogen isotopes of ammonium (δ¹⁵N–NH₄⁺) in precipitation have been analyzed, to study their monthly variations, from Oct. 2008 to Sep. 2009 at Guiyang, Southwest China. δ¹⁵N–NH₄⁺values were higher in winter and lower in summer showing a strong sine curve. In summer (rainy season), raindrop may remove more light ammonia by washout process, because raindrop incorporated ¹⁵NH₃ preferentially while left the ¹⁴N in the atmosphere. At the same time, longer sunshine times imply more hv for producing H₂SO₄ of SO₂ to H₂SO₄, which accelerates gaseous to particle conversion of NH₃ to (NH₄)₂SO₄ by unidirectional reactions for isotopic enriched ¹⁴N. The above two aspects can somewhat cause the seasonal variation of nitrogen isotopic composition, but are not the main or direct reasons. The temperature has an opposite trend with seasonal variation of δ¹⁵N values. The temperature not only causes seasonal variation of δ¹⁵N values, but also increases the volatilization rate of NH₃ and microbial activities. And there is a robust linear relationship between temperature and δ¹⁵N, showing that the temperature is the main factor to decide the monthly variation of δ¹⁵N–NH₄⁺
学科主题	环境地球化学
语种	英语
公开日期	2018-01-09
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/7103]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Ai-min Long,Yan-Li Wang,Hong-Wei Xiao,et al. Who controls the monthly variations of NH4+ nitrogen isotope composition in precipitation?[J]. Atmospheric Environment,2012,54(1):201-206.
APA	Ai-min Long,Yan-Li Wang,Hong-Wei Xiao,&Hua-Yun Xiao.(2012).Who controls the monthly variations of NH4+ nitrogen isotope composition in precipitation?.Atmospheric Environment,54(1),201-206.
MLA	Ai-min Long,et al."Who controls the monthly variations of NH4+ nitrogen isotope composition in precipitation?".Atmospheric Environment 54.1(2012):201-206.