Remotely operable compact instruments for measuring atmospheric CO 2 and CH4 column densities at surface monitoring sites

N. Kobayashi, G. Inoue, M. Kawasaki, H. Yoshioka, M. Minomura, I. Murata, T. Nagahama, Y. Matsumi, T. Tanaka, I. Morino, T. Ibuki

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Remotely operable compact instruments for measuring atmospheric CO 2 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 CO 2 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.

Original languageEnglish
Pages (from-to)1103-1112
Number of pages10
JournalAtmospheric Measurement Techniques
Volume3
Issue number4
DOIs
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Atmospheric Science

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