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www.atmos-meas-tech-discuss.net/3/1615/2010/
doi:10.5194/amtd-3-1615-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Remotely operable compact instruments for measuring atmospheric CO2 and CH4 column densities at surface monitoring sites
1Research Institute for Humanity and Nature, Kyoto 603-8047, Japan
2Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan
3Department of Geophysics, Tohoku University, Sendai 980-8578, Japan
4Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
Abstract. 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 I0 and 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.
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Notice on Discussion StatusCitation: Kobayashi, N., Inoue, G., Kawasaki, M., Yoshioka, H., Minomura, M., Murata, I., Nagahama, T., Matsumi, Y., and Ibuki, T.: Remotely operable compact instruments for measuring atmospheric CO2 and CH4 column densities at surface monitoring sites, Atmos. Meas. Tech. Discuss., 3, 1615-1644, doi:10.5194/amtd-3-1615-2010, 2010. Bibtex EndNote Reference Manager XML
