Usability of optical spectrum analyzer in measuring atmospheric CO 2 and CH 4 column densities: inspection with FTS and aircraft profiles in situ

Kawasaki, M.; Yoshioka, H.; Jones, N. B.; Macatangay, R.; Griffith, D. W. T.; Kawakami, S.; Ohyama, H.; Tanaka, T.; Morino, I.; Uchino, O.; Ibuki, T.

The practical usefulness of a desktop optical spectrum analyzer (OSA) for measuring atmospheric CO 2 and CH 4 column densities at surface sites was examined in two separate measurement campaigns. The first comparison involved operating the OSA in parallel with a high resolution Fourier transform spectroscopy (FTS) situated at the University of Wollongong in Australia. Scale factors for the OSA were assigned for the column average volume mixing ratios of xCO 2 and xCH 4 by comparing with the well-studied FTS. The second method is a calibration against aircraft CO 2 profiles in situ over Tsukuba in Japan obtained during a GOSAT validation campaign carried out from 28 January to 7 February 2011. The xCO 2 values in the campaign, deduced by use of a derived OSA scale factor, were in excellent agreement with the integrated aircraft profiles.

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Kawasaki, M. / Yoshioka, H. / Jones, N. B. / et al: Usability of optical spectrum analyzer in measuring atmospheric CO2 and CH4 column densities: inspection with FTS and aircraft profiles in situ. 2012. Copernicus Publications.

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