首页|An automated dynamic chamber system for exchange flux measurement of reactive nitrogen oxides (HONO and NO_x) in farmland ecosystems of the Huaihe River Basin, China

An automated dynamic chamber system for exchange flux measurement of reactive nitrogen oxides (HONO and NO_x) in farmland ecosystems of the Huaihe River Basin, China

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  • NETL
  • NSTL
  • Elsevier
An automated dynamic chamber system was first developed to simultaneously measure the HONO flux and NOx flux. The new dynamic chamber system was applied to field observation, and the HONO and NO_x exchange flux of farmland in the Huaihe River Basin was obtained for the first time. The performance of the dynamic chamber system was verified in the field. In the field observation, the diurnal variations of the HONO fluxes and NO fluxes before and after a rainfall event exhibited two different trends. Before the rainfall and in the latter stage after the rainfall, the maxima of the HONO fluxes and NO fluxes occurred in the morning, then decreased gradually. However, during the early stage after the rainfall, the HONO fluxes and NO fluxes gradually increased in the morning and reached their maximum values in the afternoon. During the measurement period, the maximum HONO flux was 7.69 ng N m~(-2) s~(-1) and the maximum NO flux was 34.52 ng N m~(-2) s~(-1). There was no significant correlation between HONO flux and temperature before the rainfall and in the latter stage after the rainfall period, although the correlation coefficient (R) between HONO flux and temperature reached 0.78 in the early stage after the rainfall period, and the R between NO flux and HONO flux reached more than 0.6 before and after rainfall periods. The HONO flux of fresh soil samples were the same order of magnitude as that of field observations. The field results indicate that soil emissions are an important source of atmospheric HONO during the crop growth stage. Negative NO_2 fluxes were found in most observation periods, and there were significant negative linear correlations between NO_2 fluxes and atmospheric NO_2 concentrations. The R between ambient NO_2 concentration and NO_2 flux was 0.79, and the compensation point of NO_2 was 5 ppbv.

Automated dynamic chamberAgricultural soilHONO fluxNO_x flux

Ke Tang、Min Qin、Wu Fang、Jun Duan、Fanhao Meng、Kaidi Ye、Helu Zhang、Pinhua Xie、Jianguo Liu、Wenqing Liu、Yan Feng、Yong Huang、Ting Ni

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Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China,University of Science and Technology of China, Hefei 230027, China

Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China,University of Science and Technology of China, Hefei 230027, China,CAS Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China

Anhui Institute of Meteorological Sciences, Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing, Hefei 230031, China,Shouxian National Climatology Observatory, Huaihe River Basin Typical Farm Eco-meteorological Experiment Field of CMA, Shouxian 232200, China

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2020

10.1016/j.scitotenv.2020.140867

Science of the Total Environment

Science of the Total Environment

EIISTP
ISSN：0048-9697
年,卷(期)：2020.745(Nov.25)
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