Zhu Zhilin1; Sun Xiaomin1; Dong Yunshe1; Zhao Fenghua1; Meixner Franz X2
Source Publicationsciencechinaearthsciences
AbstractHigh concentration ground-level ozone (O_3) has adverse effects on plant growth and photosynthesis. Compared to the O_3 concentration-based index, the O_3 flux-based (especially stomatal O_3 uptake) index has been considered the better criterion for assessing the impact of ozone on vegetation and ecosystems. This paper reports on a study of O_3 flux using the eddy covariance technique over a corn field in the Northwestern Shandong Plain of China. Diurnal variation of atmospheric O_3 concentration, deposition velocity and flux, and their relationships to environmental factors are analyzed. The results show that: (1) During the observation period (9 August-28 September, 2011), there was a strong diurnal variation of O_3 concentration, with low (16.5 nL L~(-1)) and high (60.1 nL L~(-1)) O_3 mean concentrations observed around 6:30 and 16:00, respectively. Mean O_3 concentrations during daytime (6:00-18:00) and nighttime (18:00-6:00) were 39.8±23.1 and 20.7±14.1 nL L~(-1) (mean±std), respectively. The maximum observed concentration was 97.5 nL L~(-1). The concentration was mainly affected by solar radiation and air temperature. (2) Whether daytime or nighttime, ground-level O_3 flux is always downward. The diurnal course of mean deposition velocity was divided into 4 phases: a low and stable process during nighttime, fast increasing in early morning, relatively large and steady changes around noon, and quickly decreasing in later afternoon. Daytime and nighttime mean deposition velocities were 0.29 and 0.09 cm s~(-1), respectively. The maximum deposition velocity was 0.81 cm s~(-1). The magnitude of deposition velocity was influenced by the corn growth period, and its diurnal variation was significantly correlated with global radiation and relative humidity. (3) O_3 flux was affected by variations of both O_3 concentration and deposition velocity, with mean O_3 fluxes ?317.7 and -70.2 ng m~(-2) s~(-1) during daytime and nighttime, respectively. There was strong correlation between O_3 flux and CO_2 flux or latent heat flux. By comparing the deposition velocities of daytime and nighttime, we infer that stomatal uptake was probably the main sink of ground-level O_3.
Document Type期刊论文
2.Biogeochemistry Department, Max Planck Institute for Chemistry
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Zhu Zhilin,Sun Xiaomin,Dong Yunshe,et al. diurnalvariationofozonefluxovercornfieldinnorthwesternshandongplainofchina[J]. sciencechinaearthsciences,2014,57(3):503.
APA Zhu Zhilin,Sun Xiaomin,Dong Yunshe,Zhao Fenghua,&Meixner Franz X.(2014).diurnalvariationofozonefluxovercornfieldinnorthwesternshandongplainofchina.sciencechinaearthsciences,57(3),503.
MLA Zhu Zhilin,et al."diurnalvariationofozonefluxovercornfieldinnorthwesternshandongplainofchina".sciencechinaearthsciences 57.3(2014):503.
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