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Measurement of HONO flux using the aerodynamic gradient method over an agricultural field in the Huaihe River Basin,China

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Journal of Environmental Sciences 2022年第4期34卷 297-307页

作者： Fanhao Meng Min Qin Wu Fang Jun Duan Ke Tang Helu Zhang Dou Shao Zhitang Liao Yan Feng Yong Huang Ting Ni Pinhua Xie Jianguo Liu Wenqing Liu Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Anhui Institute of Meteorological Sciences Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote SensingHefei 230031China Shouxian National Climatology Observatory Huaihe River Basin Typical Farm Eco-meteorological Experiment Field of China Meteorological AdministrationShouxian 232200China

To investigate nitrous acid(HONO)levels and potential HONO sources above crop rotation *** HONO fluxes were measured by the aerodynamic gradient(AG)method from 14 December 2019 to 2 January 2020 over an agricultural field in the Huaihe River *** ambient HONO levels were measured at two different heights(0.15 and 1.5 m),showing a typical diurnal cycle with low daytime levels and high nighttime *** upward HONO fluxes were mostly observed during the day,whereas deposition dominated at *** diurnal variation of HONO flux followed solar radiation,with a noontime maximum of 0.2 nmol/(m^(2)·sec).The average upward HONO flux of 0.06±0.17 nmol/(m^(2)·sec)indicated that the agricultural field was a net source for atmospheric *** higher HONO/NO_(2)ratio and NO_(2)-to-HONO conversion rate close to the surface suggested that nocturnal HONO was formed and released near the *** unknown HONO source was derived from the daytime HONO budget analysis,with an average strength of 0.31 ppbV/hr at *** surface HONO flux,which was highly correlated with the photolysis frequency J(NO_(2))(R^(2)=0.925)and the product of J(NO_(2))×NO_(2)(R^(2)=0.840),accounted for∼23%of unknown daytime HONO *** significant correlation between HONO fluxes and J(NO_(2))suggests a light-driven HONO formation mechanism responsible for the surface HONO flux during daytime.

关键词： aerodynamic gradient method HONO flux Huaihe River Basin Agricultural field

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