Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Volume 3, issue 4
Atmos. Meas. Tech., 3, 1103–1112, 2010
https://doi.org/10.5194/amt-3-1103-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 3, 1103–1112, 2010
https://doi.org/10.5194/amt-3-1103-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  24 Aug 2010

24 Aug 2010

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

N. Kobayashi1, G. Inoue1, M. Kawasaki1,2, H. Yoshioka2, M. Minomura2, I. Murata3, T. Nagahama4, Y. Matsumi4, T. Tanaka5, I. Morino5, and T. Ibuki2 N. Kobayashi et al.
  • 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
  • 5National Institute for Environmental Studies, Tsukuba, 305-8506, 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 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.

Publications Copernicus
Download
Citation