References

AMT

Atmospheric Measurement Techniques

AMT

Atmos. Meas. Tech.

1867-8548

Copernicus Publications

Göttingen, Germany

10.5194/amt-3-1103-2010

Remotely operable compact instruments for measuring atmospheric CO2 and CH4 column densities at surface monitoring sites

Kobayashi

¹ Inoue

¹ Kawasaki

¹ ² Yoshioka

² Minomura

² Murata

³ Nagahama

⁴ Matsumi

⁴ Tanaka

⁵ Morino

⁵ 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

24 08 2010

3 4 1103 1112

2010

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

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The full text article is available as a PDF file from https://amt.copernicus.org/articles/3/1103/2010/amt-3-1103-2010.pdf

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 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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