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| Titel |
Remotely operable compact instruments for measuring atmospheric CO2 and CH4 column densities at surface monitoring sites |
| VerfasserIn |
N. Kobayashi, G. Inoue, M. Kawasaki, H. Yoshioka, M. Minomura, I. Murata, T. Nagahama, Y. Matsumi, T. Tanaka, I. Morino, T. Ibuki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 4 ; Nr. 3, no. 4 (2010-08-24), S.1103-1112 |
| Datensatznummer |
250001223
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| Publikation (Nr.) |
 copernicus.org/amt-3-1103-2010.pdf |
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| Zusammenfassung |
| 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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