Atmospheric CO_2 retrieval with a look-up-table based method by combining near and thermal infrared spectra

作者：WU Jun; FANG Yong hua; WANG Xian hua; YE Han han; JIANG Xin hua; University of Science and Technology of China; Key Laboratory of Optical Calibration and Characterization Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences

来源：Journal of Beijing Institute of Technology, 2014, (04): 557-565.

• retrieval
• high resolution IR spectra
• look-up-table(LUT)
• atmospheric CO2

In order to precisely retrieve the atmospheric CO2,a retrieval method based on both near infrared(NIR)and thermal infrared(TIR)is established firstly.Then a look-up-table(LUT)based fast lineby-line radiative transfer model(RTM)was integrated into the retrieval procedure to accelerate radiative transfer calculations.The LUT stores gas absorption cross-sections as a function of temperature,pressure and wavenumber.It could greatly reduce calculating time in radiative transfer compared to direct line-byline method.Then retrieval was simulated using NIR,TIR and both bands.The retrieved CO2 profiles suggest joint approach could reconstruct CO2 profile better than those using NIR or TIR alone.Joint retrieval using both bands simultaneously could provide better constrain to CO2 vertical distribution in the whole troposphere.

• 出版日期2014-12-24
• 单位中国科学技术大学