The seasonal variation of column abundance of atmospheric CH4 and precipitable water derived from ground-based IR solar spectra |
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| Institution: | 1. Center for Applied Math, Cornell University, Ithaca, NY 14853, USA;2. Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, USA;3. Department of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA;4. Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA;5. Department of Operations Research and Information Engineering, Cornell University, Ithaca, NY 14853, USA;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China;2. Brain-inspired Integrated Chip and Systems Research Center, University of Electronic Science and Technology of China, Chengdu 610054, PR China;3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. Science Systems and Applications Inc., Hampton, VA 23666, USA;2. NASA Langley Research Center, Hampton, VA 23681, USA;3. Ball Aerospace and Technologies Corp., Boulder, CO 80301, USA;4. NASA Headquarters, Washington, DC 20546, USA;1. Howard University, 2355 6th Street NW, Washington, DC 20059, USA;2. Atmospheric Sciences Research Center, State University of New York at Albany, Albany, NY 12203, USA |
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| Abstract: | Infrared (IR) solar spectra on clear days were measured automatically by an IR solar spectrometer (ISS), capable of 0.4 cm?1 resolution, developed by us. A line-by-line computation method was used to calculate theoretical atmospheric absorption. In the wavelength range of 3.410–3.438 μm, the absorption is mainly due to atmospheric methane and water vapor. Column atmospheric methane was retrieved from the recorded IR solar spectra. The seasonal variation of column atmospheric methane in Hefei was obtained from the measuremental data of nearly 18 months since April 1997, and the seasonal variation was found to be similar to that of background data. The cycles of precipitable water were also obtained simultaneously, and the observed precipitable water coincided with that of a radiosonde. The instruments, principles of measurement and some of the results are introduced, and the results are also discussed briefly in this paper. |
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