Analysis of the information content and vertical resolution of the ground-based spectroscopic IR method for the CO2 vertical structure retrieval
Yu.M. Timofeev, N.N. Filippov, A.V. Poberovsky
Saint-Petersburg State University, St. Petersburg, Russia
Keywords: infrared Fourier transform spectrometry, carbon dioxide remote sensing, information content, vertical resolution
Abstract
The retrieval of the vertical structure of carbon dioxide content is important for studying the exchange of greenhouse gases between the troposphere, where the anthropogenic factor determines the growth of their content, and the stratosphere. In this study, we analyzed the potential information content and vertical resolution of the ground-based IR spectroscopic method for determining CO2 profiles using solar radiation measurements with the Bruker 125 HR Fourier spectrometer at the St. Petersburg site. Based on methodological studies of various spectral windows and areas, we have shown that it is possible to determine 3-4 independent parameters of the CO2 vertical structure. Measurements in the strong and medium absorption lines provide maximum information on the CO2 content in the lower and middle troposphere with a vertical resolution of 3-5 km. The weak absorption lines provide information on the CO2 content in the stratosphere with a vertical resolution of 10-25 km.
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