Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-3401-2010 http://www.atmos-chem-phys-discuss.net/10/3401/2010/ http://www.atmos-chem-phys-discuss.net/10/3401/2010/acpd-10-3401-2010.html http://www.atmos-chem-phys-discuss.net/10/3401/2010/acpd-10-3401-2010.pdf 3401 3421 2010-02-09 CO₂ column-averaged volume mixing ratio derived over Tsukuba from measurements by commercial airlines M. Araki araki@rs.kagu.tus.ac.jp I. Morino T. Machida Y. Sawa H. Matsueda T. Yokota O. Uchino National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, baraki 305-8506, Japan Meteorological Research Institute, 1-1 Nagamine, Tsukuba 305-0052, Japan now at: Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan Column-averaged volume mixing ratios of carbon dioxide (<i>X</i>_CO₂) during the period from January 2007 to May 2008 over Tsukuba, Japan, were derived by using CO₂ concentration data observed by Japan Airlines Corporation (JAL) commercial airliners, based on the assumption that CO₂ profiles over Tsukuba and Narita were the same. CO₂ profile data for 493 flights on clear-sky days were analysed in order to calculate <i>X</i>_CO₂ with an ancillary dataset: Tsukuba observational data (by rawinsonde and a meteorological tower) or global meteorological data (NCEP and CIRA-86). The amplitude of seasonal variation of <i>X</i>_CO₂ (Tsukuba observational) from the Tsukuba observational data was determined by least-squares fit using a harmonic function to roughly evaluate the seasonal variation over Tsukuba. The highest and lowest values of the obtained fitted curve in 2007 for <i>X</i>_CO₂ (Tsukuba observational) were 386.4 and 381.7 ppm in May and September, respectively. The dependence of <i>X</i>_CO₂ on the type of ancillary dataset was evaluated. The average difference between <i>X</i>_CO₂ (global) from global climatological data and <i>X</i>_CO₂ (Tsukuba observational), i.e., the bias of <i>X</i>_CO₂ (global) based on <i>X</i>_CO₂ (Tsukuba observational), was found to be -0.621 ppm with a standard deviation of 0.682 ppm. The uncertainty of <i>X</i>_CO₂ (global) based on <i>X</i>_CO₂ (Tsukuba observational) was estimated to be 0.922 ppm. 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