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Nitrogen isotope variations of ammonium across rain events: Implications for different scavenging between ammonia and particulate ammonium
Xu-Dong Zheng;  Xue-Yan Liu;  Wei Song;  Xin-Chao Sun;  Cong-Qiang Liu
2018
发表期刊Environmental Pollution
卷号239页码:392-398
摘要

Enhanced ammonia (NH3) emissions and deposition caused negative effects on air quality and ecosystems. Precipitation is an efficient pathway to remove NH3 and particulate ammonium (p-NH4+) from the atmosphere into ecosystems. However, precipitation scavenging of p-NH4+ in chemical transport models has often considered fine p-NH4+, with inadequate constraints on NH3 and coarse p-NH4+. Based on distinct delta N-15 values between NH3 and NH4+ in PM2.5 (particulate matters with aerodynamic diameters <= 2.5 mu m) or TSP (total suspended particulates), this paper interpreted intra-event variations of precipitation NH4+ concentrations and delta N-15 values (delta N-15-NH4+ values) at Guiyang (Xiao et al., 2015). Generally decreased NH4+ concentrations across rain events reflected decreasing scavenging of NH3 and p-NH4+. Using a Bayesian isotope mixing model, we found that differing contributions between N-15-depleted NH3 and N-15-enriched p-NH4+ were responsible for the three-stage variations of intra-event delta N-15-NH4+ values. The decreases of delta N-15-NH4+ values across the first and third stages indicated more decreases in scavenging p-NHZ than NH3, while the increases of delta N-15-NH4+ values across the second stage were resulted primarily from more increases in scavenging p-NH4+ (particularly fine p-NH4+) than NH3. These results stressed influences of differing scavenging between NH3 and p-NI-14- on precipitation delta N-15-NH4+ values, which should be considered in modeling precipitation scavenging of atmospheric p-NH4+.

关键词Stable Isotope ammonium scavenging precipitation pm2.5 tsp
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8791
专题环境地球化学国家重点实验室
作者单位1.Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
推荐引用方式
GB/T 7714
Xu-Dong Zheng;Xue-Yan Liu;Wei Song;Xin-Chao Sun;Cong-Qiang Liu. Nitrogen isotope variations of ammonium across rain events: Implications for different scavenging between ammonia and particulate ammonium[J]. Environmental Pollution,2018,239:392-398.
APA Xu-Dong Zheng;Xue-Yan Liu;Wei Song;Xin-Chao Sun;Cong-Qiang Liu.(2018).Nitrogen isotope variations of ammonium across rain events: Implications for different scavenging between ammonia and particulate ammonium.Environmental Pollution,239,392-398.
MLA Xu-Dong Zheng;Xue-Yan Liu;Wei Song;Xin-Chao Sun;Cong-Qiang Liu."Nitrogen isotope variations of ammonium across rain events: Implications for different scavenging between ammonia and particulate ammonium".Environmental Pollution 239(2018):392-398.
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