Atmospheric Measurement Techniques www.atmos-meas-tech.net 1867-1381 1867-8548 3 4 2010 10.5194/amt-3-1103-2010 http://www.atmos-meas-tech.net/3/1103/2010/ http://www.atmos-meas-tech.net/3/1103/2010/amt-3-1103-2010.html http://www.atmos-meas-tech.net/3/1103/2010/amt-3-1103-2010.pdf 1103 1112 2010-08-24 Remotely operable compact instruments for measuring atmospheric CO₂ and CH₄ column densities at surface monitoring sites N. Kobayashi G. Inoue M. Kawasaki kawasaki@moleng.kyoto-u.ac.jp H. Yoshioka M. Minomura I. Murata T. Nagahama Y. Matsumi T. Tanaka I. Morino T. Ibuki Research Institute for Humanity and Nature, Kyoto 603-8047, Japan Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan Department of Geophysics, Tohoku University, Sendai 980-8578, Japan Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan National Institute for Environmental Studies, Tsukuba, 305-8506, Japan Remotely operable compact instruments for measuring atmospheric CO₂ and CH₄ column densities were developed in two independent systems: one utilizing a grating-based desktop optical spectrum analyzer (OSA) with a resolution enough to resolve rotational lines of CO₂ and CH₄ in the regions of 1565–1585 and 1674–1682 nm, respectively; the other is an application of an optical fiber Fabry-Perot interferometer (FFPI) to obtain the CO₂ column density. Direct sunlight was collimated via a small telescope installed on a portable sun tracker and then transmitted through an optical fiber into the OSA or the FFPI for optical analysis. The near infrared spectra of the OSA were retrieved by a least squares spectral fitting algorithm. The CO₂ and CH₄ column densities deduced were in excellent agreement with those measured by a Fourier transform spectrometer with high resolution. The rovibronic lines in the wavelength region of 1570–1575 nm were analyzed by the FFPI. The <i>I</i>₀ and <i>I</i> values in the Beer-Lambert law equation to obtain CO₂ column density were deduced by modulating temperature of the FFPI, which offered column CO₂ with the statistical error less than 0.2% for six hours measurement. Araki, M., Morino, I., Machida, T., Sawa, Y., Matsueda, H., Ohyama, H., Yokota, T., and Uchino, O.: CO₂ column-averaged volume mixing ratio derived over Tsukuba from measurements by commercial airlines, Atmos. Chem. 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