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Use of isotopic compositions of nitrate in TSP to identify sources and chemistry in South China Sea
Xiao, Hong-Wei; Xie, Lu-Hua; Long, Ai-Min; Ye, Feng; Pan, Yue-Peng; Li, Da-Ning; Long, Zhen-Hua; Chen, Lin; Xiao, Hua-Yun; Liu, Cong-Qiang;;
AbstractNO3- concentration, nitrogen and oxygen isotopic compositions (delta N-15 and delta O-18) of NO3- were measured in total suspended particulates (TSP) at Yongxing Island in the South China Sea (SCS) between Feb. 2013 and Jan. 2014, as well as on two cruises in the northern South China Sea (NSCS). Measurements aimed to identify NO3- sources, and possible chemical formation processes of NO3-. The delta N-15 and delta O-18 of NO3- in TSP at Yongxing Island ranged from -2.5 to +4.9 parts per thousand, and +48.1 to +99.0 parts per thousand, with annual weighted averages of +1.5 parts per thousand and +83.2 parts per thousand, respectively. Both delta N-15 and delta O-18 had higher values in cool months, indicating that NOx sources and oxidants were different between seasons. In cool months, NOx was mainly from anthropogenic sources, particularly from coal combustion in South China, resulting in high nitrogen deposition that was oxidized by 03 to NO3-. In warm months, natural emissions were an important source of NOx. TSP samples in the NSCS had higher NO3- concentrations, higher delta N-15 and lower delta O-18 values than samples from Yongxing Island over the same period. This suggests that atmospheric processes caused a decrease in NO3- concentrations and delta N-15 but increase in delta O-18 from coast to remote marine. Assuming to oxygen atoms were derived from O-3 during transport in cool months, the mean ratio of NO3- formed by NOx to total NO3- was calculated to be 47.9%. This suggests the mean loss ratio of NOx was 89% while the loss ratio of NO3- was 87% during transport between Chinese coastal areas and Yongxing Island in Nov., 2013. (C)) 2015 Elsevier Ltd. All rights reserved.
Department[Xiao, Hong-Wei; Long, Ai-Min] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Xie, Lu-Hua; Ye, Feng] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China; [Pan, Yue-Peng] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China; [Li, Da-Ning; Long, Zhen-Hua; Chen, Lin] Chinese Acad Sci, South China Sea Inst Oceanol, Xisha Deep Sea Marine Environm Observat & Res Stn, Sansha 157009, Peoples R China; [Xiao, Hua-Yun; Liu, Cong-Qiang] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China ; LTO
KeywordNitrogen Isotope Oxygen Isotope South China Sea Nitrate Atmospheric Chemical Process Isotopic Fractionation
Subject AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
Document Type期刊论文
Recommended Citation
GB/T 7714
Xiao, Hong-Wei,Xie, Lu-Hua,Long, Ai-Min,et al. Use of isotopic compositions of nitrate in TSP to identify sources and chemistry in South China Sea[J]. ATMOSPHERIC ENVIRONMENT,2015,109:70-78.
APA Xiao, Hong-Wei.,Xie, Lu-Hua.,Long, Ai-Min.,Ye, Feng.,Pan, Yue-Peng.,...& of isotopic compositions of nitrate in TSP to identify sources and chemistry in South China Sea.ATMOSPHERIC ENVIRONMENT,109,70-78.
MLA Xiao, Hong-Wei,et al."Use of isotopic compositions of nitrate in TSP to identify sources and chemistry in South China Sea".ATMOSPHERIC ENVIRONMENT 109(2015):70-78.
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