Combining chemical components with stable isotopes to determine nitrate sources of precipitation in Hangzhou and Huzhou, SE China
Combining chemical components with stable isotopes to determine nitrate sources of precipitation in Hangzhou and Huzhou, SE China
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结合化学成分与稳定同位素确定中国东南部杭州和湖州降水的硝酸盐来源
DOI：
10.1016/j.apr.2018.09.004
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发表时间：
2019-03
影响因子：
4.5
通讯作者：
Li feili
中科院分区：
文献类型：
--
作者：
Jin Zanfang;Wang Yan;Qian Lijing;Hu Yuming;Jin Xingpeng;Hong Chenchen;Li feili
利用化学成分、大气污染物和NO3-稳定同位素等数据，分析了2015 - 2017年杭州和湖州降水中NO3-的来源，并揭示了这两个城市的NO3-转化机制。杭州市NO3-的平均浓度（月加权平均值）为49.52 μmol L− 1，高于湖州市的NO3-浓度（39.35 μmol L−1）。δ 15 N-NO3值（-4.4 ‰-3.7‰）和δ 18 O-NO3值（27.9‰-83.4‰）在研究区变化较大。结果表明，杭州和湖州的主要NO3-来源包括煤炭消费，交通排放和土壤排放。杭州较高的交通排放水平是造成杭州和湖州之间NO3−浓度和δ 15 N-NO3值空间差异的主要原因。不同的NO2氧化途径对NO3-中氧稳定同位素的季节变化特别重要。由于NO2在N2 O 5途径中通过O3氧化生成HNO 3，因此在冬季观测到最高的δ 18 O-NO3值。δ 18 O-NO3值最低的季节是夏季，主要是由于NO通过OH途径氧化生成HNO 3所致。δ 15 N-NO3值的季节变化受研究区降水中主要NO3−来源贡献的变化影响：夏季土壤排放增加，冬季取暖用煤增加了北方杭州和湖州的燃煤排放。
The chemical components, air pollutants and stable isotopes of NO3−were used to determine NO3−sources in precipitation and reveal NOxtransformation mechanisms from 2015 to 2017 in the cities of Hangzhou and Huzhou, which are representative of most cities in Southeastern China (SE China). The mean concentrations (monthly weighted-mean values) of NO3−were 49.52 μmol L−1in Hangzhou, and were higher than NO3−concentrations (39.35 μmol L−1) in Huzhou. Both δ15N-NO3values (−4.4‰–3.7‰) and δ18O-NO3values (27.9‰–83.4‰) varied widely in the study areas. It was demonstrated that the main NO3−sources in Hangzhou and Huzhou included coal consumption, traffic emissions and soil emissions. Higher levels of traffic emissions in Hangzhou were responsible for the spatial variations in NO3−concentrations and δ15N-NO3values between Hangzhou and Huzhou. The different NO2oxidation pathways are particularly important in seasonal variation of oxygen stable isotope in NO3−. Due to the oxidation of NO2via O3forming HNO3in the N2O5pathway, the highest δ18O-NO3values were observed in the winter. The lowest δ18O-NO3values were explained by the NOxoxidation forming HNO3via the OH pathway in the summer. The seasonal variation of δ15N-NO3values was influenced by the changing contributions of the main NO3−sources in precipitation collected from the study areas: soil emissions increased in summer and coal consumption emissions increased because of coal consumption for winter heating from northern China in Hangzhou and Huzhou.
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影响因子：
5
作者：
A. Buda;D. R. Dewalle
通讯作者：
A. Buda;D. R. Dewalle
影响因子：
4.5
作者：
F. Buzek;B. Cejkova;L. Hellebrandová;I. Jačková;V. Lollek;Zdena Lnenickova;R. Matolakova;F. Veselovský
通讯作者：
F. Buzek;B. Cejkova;L. Hellebrandová;I. Jačková;V. Lollek;Zdena Lnenickova;R. Matolakova;F. Veselovský
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影响因子：
8.9
作者：
Xu Wen;Zhao Yuanhong;Liu Xuejun;Dore Anthony J.;Zhang Lin;Liu Lei;Cheng Miaomiao
通讯作者：
Cheng Miaomiao
影响因子：
--
作者：
J. Kahl;Dewayne A. Martinez;H. Kuhns;C. Davidson;J. Jaffrezo;J. Harris
通讯作者：
J. Kahl;Dewayne A. Martinez;H. Kuhns;C. Davidson;J. Jaffrezo;J. Harris
影响因子：
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作者：
M. Hastings;E. Steig;D. Sigman
通讯作者：
M. Hastings;E. Steig;D. Sigman