文献类型：期刊文献

英文题名：Nitrate sources and formation in aerosol and precipitation in a tropical city in South China: Insight from nitrate dual isotopes

作者：Luo, Huijie[1,2,3];Lao, Qibin[1,2,3];Chen, Fajin[1,2,3];Chen, Chunqing[1,2,3];Zhou, Xin[1,2,3];Jin, Guangzhe[1,2,3];Zhu, Qingmei[1,2,3];Lu, Xuan[1,2,3]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Key Lab Climate Resources & Environm Continental, Dept Educ Guangdong Prov, Zhanjiang 524088, Guangdong, Peoples R China

年份：2022

卷号：278

外文期刊名：ATMOSPHERIC ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000792898100003)、、EI(收录号：20221311874001)、Scopus(收录号：2-s2.0-85127162849)、WOS

基金：Acknowledgements This work was supported by National Natural Science Foundation of China (U1901213) , Guangdong Natural Science Foundation of China (2019B1515120066, 2016A030312004) , Guangxi Natural Science Foundation of China (2020GXNSFBA297065) .

语种：英文

外文关键词：Nitrate; Nitrate dual isotopes; Aerosol; Precipitation; Zhanjiang; South China

外文摘要：Nitrate dual isotopes (delta N-15-NO3- and delta O-18-NO3- ) and NO3- concentration were measured in aerosol and precipitation in Zhanjiang, a tropical city in the southmost tip of mainland China, between November 2018 and October 2019. Measurements aimed to identify possible formation processes of NO3-, sources and the difference of nitrate dual isotopes between aerosol and precipitation in such tropical area. The values of delta N-15-NO3- and delta O-18-NO3- varied from-5.4%o to 3.8%o and from 50.2%o to 84.3%o in aerosol, respectively, and varied from-5.3%o to 5.3%o and from 53.7%o to 84.4%o in precipitation, respectively. The values of nitrate dual isotopes had a similar seasonal change in both aerosol and precipitation, showing that higher values in the dry season and lower values in the rainy season. This indicated that nitrate in the city had different sources and chemical formation pathway for different seasons. Similar to the precipitation, the OH radical pathway is the dominant pathway to produce atmospheric NO3- in such tropical city (accounting for 75% in the rainy season and 50% in the dry season). However, the differences of delta N-15-NO3- and delta O-18-NO3- between aerosol and precipitation were also found in Zhanjiang, suggesting that precipitation frequency is the dominant factor for the difference in delta N-15-NO3- whereas peroxy radicals are the dominant factor for the difference in delta O-18-NO3-. The complete nitrate washout that occurred from May to July suggested that delta N-15-NO3- in the aerosol can be applied to identify the nitrate sources during these periods. The atmospheric nitrate sources calculated by a Bayesian model showed that vehicle emission (35%), lightning (27%) and biomass burning (26%) were the main atmospheric nitrate sources in Zhanjiang.