An improved retrieving method of vertical CO2 concentrations profile for dial

The vertical profile of atmospheric carbon dioxide is of great significance for carbon cycle and budget study. However, that parameter can be only obtained by flask samples from profiling aircraft till now. Ground-based differential absorption lidar is widely accepted as a promising remote sensing means to obtain the vertical CO₂ concentration profile. Unfortunately, classic DIAL retrieving method cannot provide results of adequate accuracy and precision. Here, we propose an improved retrieving method to solve this problem. Experiments showed that the accuracy and precision of results are superior to 0.2 ppm (parts per million) and 4E-5 ppm respectively by means of the proposed method. That could be an ideal result for further carbon cycle and climate change research.