Measurement of CO2 rectifier effect during summer and winter using ground-based differential absorption LiDAR
2020
Shi, Tianqi | Ma, Xin | Han, Ge | Xu, Hao | Qiu, Ruonan | He, Bin | Gong, Wei
The rectifier effect refers to the exchange of CO₂ near the boundary layer of the atmosphere. This effect is an important part of the carbon cycle because it affects the vertical distribution of CO₂ and indirectly affects global CO₂ distribution. However, the intensity of this effect is difficult to measure directly. A differential absorption LiDAR (DIAL) system can observe the rectifier effect because this device can accurately measure planetary boundary layer height (PBLH) and CO₂ profile concentration (Quan et al., 2014; Guo et al., 2016). Accordingly, we conducted experiments in Huainan, China using a DIAL system for CO₂ detection developed by our group. We selected two cases, namely, summer and winter, for the analysis. Firstly, we calculated CO₂ profile, average CO₂ concentration and PBLH. Secondly, we analysed the rectifier effect. Results showed a negative correlation between PBLH and the rectifier effect. Simultaneously, we observed a special phenomenon in which CO₂ concentration is lower near the ground than in high altitudes. This phenomenon may be explained by the activities of plants.
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