气候变化领域集成服务门户(CCPortal): Radiatively driven NH3 release from agricultural field during wintertime slack season

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DOI	10.1016/j.atmosenv.2021.118228
	Radiatively driven NH3 release from agricultural field during wintertime slack season
	Zheng J.; Zhang Y.; Ma Y.; Ye N.; Khalizov A.F.; Yan J.
发表日期	2021
ISSN	1352-2310
卷号	247
英文摘要	A chemical ionization mass spectrometer (CIMS) was deployed to measure ambient ammonia (NH3) with a time-resolution of ~5 min. Unexpectedly high levels of NH3, peaking at 15.5 ppbv and averaging at 2.1 ± 1.9 ppbv, were observed near an agricultural field in Nanjing, China, during wintertime, a slack season for farming. Re-partitioning from aerosols can only explain a small portion of this NH3 due to the considerably low air temperature, whereas the major source was emission from soil, as indicated by significant positive correlations of the NH3 concentration with the ground surface temperature, solar radiation intensity, and particularly the surface-air temperature difference. The dissolved/adsorbed NH3 and NH4NO3 in soil likely originated from conversion of nitrogen-containing organic matter by microorganisms through ammonification and nitrification. The upward transfer of NH3 released from the soil was facilitated by convective mixing driven by solar radiation, which produced the required high soil-air temperature gradient. This winter release of NH3 from the soil is not captured by commonly used long-term, passive-sampler based methods, giving rise to an incorrect assumption that during winter, a slack season for farming, soil emits no NH3 and so this source has remained unresolved by typical emission inventory models. Our results indicate that contrary to the common assumption, agricultural background emissions are a non-negligible source of NH3 even in wintertime, which may exert a significant impact on regional air pollution formations. Hence, a refined NH3 emission inventory is critically needed to account for the haze events in wintertime northern China. © 2021 Elsevier Ltd
关键词	Agricultural emissions Ammonia Ammonium nitrate Chemical ionization mass spectrometry Gas-particle partitioning Secondary sulfate formation
语种	英语
scopus关键词	Agricultural robots; Agriculture; Ammonia; Atmospheric temperature; Soils; Solar radiation; Agricultural fields; Background emissions; Emission inventories; Ground surface temperature; Positive correlations; Regional air pollution; Solar radiation intensity; Surface air temperatures; Soil pollution; ammonia; organic matter; volatile organic compound; aerosol; agricultural land; ammonia; atmospheric pollution; emission inventory; haze; pollutant source; seasonal variation; solar radiation; winter; agriculture; air pollution; air temperature; ammonification; circadian rhythm; controlled study; fertilizer application; nitrification; particle size; priority journal; radiation field; retention time; seasonal variation; solar radiation; suburban area; surface property; thermodynamics; Nanjing [Jiangsu]
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248590
作者单位	School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China; NUIST Reading Academy, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, United States; Experimental Teaching Center for Meteorology and Environment, Nanjing University of Information Science & Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Zheng J.,Zhang Y.,Ma Y.,et al. Radiatively driven NH3 release from agricultural field during wintertime slack season[J],2021,247.
APA	Zheng J.,Zhang Y.,Ma Y.,Ye N.,Khalizov A.F.,&Yan J..(2021).Radiatively driven NH3 release from agricultural field during wintertime slack season.ATMOSPHERIC ENVIRONMENT,247.
MLA	Zheng J.,et al."Radiatively driven NH3 release from agricultural field during wintertime slack season".ATMOSPHERIC ENVIRONMENT 247(2021).