Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 2 2010 10.5194/amtd-3-1615-2010 http://www.atmos-meas-tech-discuss.net/3/1615/2010/ http://www.atmos-meas-tech-discuss.net/3/1615/2010/amtd-3-1615-2010.html http://www.atmos-meas-tech-discuss.net/3/1615/2010/amtd-3-1615-2010.pdf 1615 1644 2010-04-12 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. 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 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 region of 1565–1585 and 1674–1682 nm, respectively; the other is an application of an optical fiber Fabry-Perot interferometer (FFPI) to 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., Yokota, T., and Uchino, O.: CO₂ column-averaged volume mixing ratio derived over Tsukuba from measurements by commercial airlines, Atmos. Chem. Phys. Discuss., 10, 3401–3421, 2010. Devi, V. M., Benner, D. C., Brown, L. R., Miller, C. E., and Toth, R. 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