Comparison of methods for the determination of NO-O 3 -NO 2 fluxes and chemical interactions over a bare soil
Comparison of methods for the determination of NO-O 3 -NO 2 fluxes and chemical interactions over a bare soil
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DOI：
10.5194/amt-5-1241-2012
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发表时间：
2011-08
影响因子：
3.8
通讯作者：
P. Stella;B. Loubet;P. Laville;É. Lamaud;M. Cazaunau;Sebastian Laufs;F. Bernard;B. Grosselin;N. Mascher;R. Kurtenbach;A. Mellouki;J. Kleffmann;P. Cellier
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文献类型：
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作者：
P. Stella;B. Loubet;P. Laville;É. Lamaud;M. Cazaunau;Sebastian Laufs;F. Bernard;B. Grosselin;N. Mascher;R. Kurtenbach;A. Mellouki;J. Kleffmann;P. Cellier
抽象的。对流层臭氧 (O3) 是一种已知的温室气体，会对人类和动物健康以及生态系统功能产生影响。此外，O3 与氮氧化物一起在对流层化学中发挥着重要作用。确定这些微量气体的表面-大气交换通量是建立其大气预算和评估其对生物圈影响的先决条件。在这项研究中，使用空气动力梯度法测量了农田裸露土壤上的 O3、一氧化氮 (NO) 和二氧化氮 (NO2) 通量。臭氧和一氧化氮通量也分别使用涡流协方差和自动室进行测量。气动梯度测量系统由快速响应传感器组成，能够测量高度之间 NO 和 O3 混合比的显着差异。然而，由于局部平流，NO2 混合比高度不稳定，因此 NO2 通量与零没有显着差异。 O3、NO 和 NO2 之间的化学反应导致表面和测量高度之间的臭氧通量发散很小（平均小于通量的 1%），而 NO 通量发散平均约为 10%。使用快速响应传感器可以减少通量的不确定性。空气动力学梯度和涡协方差方法给出了可比较的 O3 通量。室 NO 通量比空气动力学梯度通量低 70%，可能是因为土壤 NO 排放的空间异质性或室本身的扰动。
Abstract. Tropospheric ozone (O3) is a known greenhouse gas responsible for impacts on human and animal health and ecosystem functioning. In addition, O3 plays an important role in tropospheric chemistry, together with nitrogen oxides. The determination of surface-atmosphere exchange fluxes of these trace gases is a prerequisite to establish their atmospheric budget and evaluate their impact onto the biosphere. In this study, O3, nitric oxide (NO) and nitrogen dioxide (NO2) fluxes were measured using the aerodynamic gradient method over a bare soil in an agricultural field. Ozone and NO fluxes were also measured using eddy-covariance and automatic chambers, respectively. The aerodynamic gradient measurement system, composed of fast response sensors, was capable to measure significant differences in NO and O3 mixing ratios between heights. However, due to local advection, NO2 mixing ratios were highly non-stationary and NO2 fluxes were, therefore, not significantly different from zero. The chemical reactions between O3, NO and NO2 led to little ozone flux divergence between the surface and the measurement height (less than 1% of the flux on average), whereas the NO flux divergence was about 10% on average. The use of fast response sensors allowed reducing the flux uncertainty. The aerodynamic gradient and the eddy-covariance methods gave comparable O3 fluxes. The chamber NO fluxes were down to 70% lower than the aerodynamic gradient fluxes, probably because of either the spatial heterogeneity of the soil NO emissions or the perturbation due to the chamber itself.