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Tropospheric profile of NO_2 over the Po Valley measured with scan DOAS spectrometer

机译：用扫描DOAS光谱仪测量的波谷NO_2的对流层剖面

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摘要

A simple method to determine the vertical distribution of a pollutant gas, namely NO_2, by means of the spectral measurements obtained with a scan-DOAS spectrometer, is presented. The developed technique can be summarized as follows: i) a series of quasi simultaneous measurements in the zenith and in others directions allowing for the determination of the Slant Column Density of NO_2 for different elevation angles; ii) an active DOAS measurement for the determination of the NO_2 concentration at the ground; iii) a set of Radiative Transfer Model (RTM) calculation of the scattering distance from the spectrometer, for a set of visibility values; iv) a recursive procedure of profile calculation starting from the first measurement and subtracting the value of NO_2 Slant Column Density (SCD) retrieved from the measurement taken at the previous angle of sight. Measurements are carried out during summer 2007 in S. Pietro Capofiume (Bologna-Italy). The vertical distribution for NO_2 obtained with the above described method has been compared with the profiles calculated with the GAMES (Gas Aerosol Modelling Evaluation System) model. The results of this comparison show some differences between the modelled and the measured profiles, probably due to box approximations in RTM calculation for measured profiles and to the large pixel grid (about 10x10 km2), for model evaluation.
机译：提出了一种简单的方法来确定污染物气体（即NO_2）的垂直分布，该方法通过使用扫描DOAS光谱仪获得的光谱测量值来确定。所开发的技术可以总结如下：i）在天顶和其他方向上进行一系列准同时测量，以便确定不同仰角下NO_2的倾斜柱密度； ii）进行有源DOAS测量以确定地面上的NO_2浓度； iii）对于一组可见度值，对离光谱仪的散射距离进行一组辐射传递模型（RTM）计算； iv）从第一个测量开始，并减去从前一个视角进行的测量中获得的NO_2斜柱密度（SCD）值，进行轮廓计算的递归程序。测量于2007年夏季在意大利博洛尼亚的S. Pietro Capofiume中进行。用上述方法获得的NO_2的垂直分布已与GAMES（气溶胶模型评估系统）模型计算得出的曲线进行了比较。比较结果表明，建模轮廓和实测轮廓之间存在一些差异，这可能是由于RTM计算中的框近似（用于实测轮廓）和大像素网格（约10x10 km2）用于模型评估。

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