globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2020.117459
论文题名:
Online characterization of a large but overlooked human excreta source of ammonia in China's urban atmosphere
作者: Shao S.-C.; Zhang Y.-L.; Chang Y.-H.; Cao F.; Lin Y.-C.; Mozaffar A.; Hong Y.-H.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 230
语种: 英语
学科: Ammonia ; Emission intensity ; Human excreta ; Isotopic signature ; Seasons
中文摘要: In urban China, human excreta are mostly stored in septic tanks beneath various buildings, and the generated NH3 are emitted to the atmosphere through ceiling ducts on rooftops. Here we performed highly time-resolved measurements of NH3 concentrations and auxiliary parameters in the ceiling duct of a typical building complex during different seasons with varying temperature and population, allowing an in-depth investigation of the driving forces in terms of governing NH3 emissions. Extremely high levels of NH3 concentration (1013 ± 793 μg m−3) were observed throughout the campaign. Seasonally, the NH3 concentration during summer vacation (1377 ± 1072 μg m−3) was significantly higher than during school time in fall (796 ± 432 μg m−3) and winter (661 ± 267 μg m−3). Moreover, the diurnal variation of NH3 during summertime was highly correlated with temperature (R2 = 0.95, p < 0.01), while it was not the case for school time with dense population (R2 = 0.47, p < 0.01, R2 = 0.57, p < 0.01 in fall, winter, respectively). The highest temperature was 35.9 °C, with an emission intensity peak of 4.1 mg s−1 while the lowest temperature was 1.3 °C with an emission intensity of 0.8 mg s−1. The nitrogen stable isotopic composition of NH3(δ15N–NH3) may be a useful tool to trace NH3 sources. Here we report the δ15N–NH3 measured from ceiling duct collected directly, which constrains human excreta source δ15N–NH3 values (meanmin max) ‰ to −35.6‰−39.8‰ −31.9‰. These results support that temperature is the key factor in controlling NH3 emissions from human excreta and demonstrate the importance of using human excreta emitted δ15N–NH3 to quantify excreta NH3 contribution in urban atmospheres. Our findings highlight opportunities to limit NH3 emissions from human excreta that will bring co-benefits to the air quality and human health in urban China. © 2020 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160799
Appears in Collections:气候变化与战略

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作者单位: Jiangsu Key Laboratory of Atmospheric Environment and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Yale-NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science & Technology, Nanjing, 210044, China; Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/ Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing, 210044, China

Recommended Citation:
Shao S.-C.,Zhang Y.-L.,Chang Y.-H.,et al. Online characterization of a large but overlooked human excreta source of ammonia in China's urban atmosphere[J]. Atmospheric Environment,2020-01-01,230
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