title: [Hourly measurement on aerosol NH3 and gas NO(x) emission in the rice field].
abstract: Aerosol NH3 and gas NO(x) are the major components in atmospheric particles and precipitation, which are key precursors to form aerosols. The intensive N fertilization in arable land is an important source of aerosol NH3 and gas NO(x), which have not been well characterized yet. During May to October in 2010, the characteristics of aerosol NH3 and gas NO(x) emission from rice field after urea application were investigated. The time resolutions of measurements were set to be one hour. The aerosol NH3 emission and metrological factors within 20 d of continuous sampling after fertilization in four experiments were monitored. The experiment on gas NO(x) emission and metrological factors influencing the emission were carried out from the beginning of the forth test, which lasted for 47 days. Results indicated that the aerosol NH3 emission factors of four tests were 2.6%, 5.5%, 4.0% and 1.6%, respectively. The corresponding aerosol NH3 emission flux of four tests were 3.97, 2.08, 1.52 and 1.22 kg x hm(-2), respectively. Temperature (air temperature and soil temperature) was found to be the main factor influencing aerosol NH3 emission in rice fields after fertilization, while the impacts of air humidity and soil moisture were not clear. After analyzing the monitoring data, it can be concluded that the ratio of the emission amount of NO2 -N and NO-N in rice fields after fertilization was 9/4; the emission factor and the emission flux of gas NO(x) were 0.14% and 0.30 kg x hm(-2), respectively. The relationship between metrological factors and gas NO(x) emission flux was also examined.
authors: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China weiwgong@163.com
authors: Wei-Wei
authors: WW
authors: Gong
authors: Sheng-Ji
authors: SJ
authors: Luan
mesh_terms: D000336:Aerosols / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis*; D064751:Ammonium Compounds / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D005308:Fertilizers; D009589:Nitrogen Oxides / Q000032:analysis*; D012275:Oryza / Q000254:growth & development*; D014508:Urea / Q000737:chemistry
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D064751:Ammonium Compounds; D005308:Fertilizers; D009589:Nitrogen Oxides; D014508:Urea