Retrieval of column-averaged volume mixing ratio of CO2 with ground-based high spectral resolution solar absorption |
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Authors: | Jian Li Chengcai Li Jietai Mao Dongwei Yang Dong Wang Lin Mei Guangming Shi Yefang Wang Xia Mao |
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Institution: | 1. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China 2. Meteorological Bureau of Shenzhen Municipality, Shenzhen, 518040, China
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Abstract: | The total column-averaged volume mixing ratio of atmospheric carbon dioxide ( $ {\text{X}}_{{{\text{CO}}_{ 2} }} $ ) has been retrieved with high spectral resolution solar absorption data obtained from ground-based Fourier transform spectrometer (FTS) measurements at Xichong, a coastal site in the district of Shenzhen in southern China. Based on differential optical absorption spectroscopy (DOAS) theory, the $ {\text{X}}_{{{\text{CO}}_{ 2} }} $ was retrieved by finding the best match of observed high spectral resolution solar absorption data and monochromatic radiation transfer model calculations. The averaged $ {\text{X}}_{{{\text{CO}}_{ 2} }} $ in the whole observation period was about 394.9 ppm. The uncertainty of the retrieval was estimated to be 2.0 ppm (0.51 %) by comparing retrievals at two bands. The preliminary results show that $ {\text{X}}_{{{\text{CO}}_{ 2} }} $ retrieved by this method can be used to validate satellite remote sensing of $ {\text{X}}_{{{\text{CO}}_{ 2} }} .$ |
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Keywords: | Global warming Column amount of carbon dioxide - DOAS High spectral resolution FTS |
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