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| Titel |
Characterization of methane retrievals from the IASI space-borne sounder |
| VerfasserIn |
A. Razavi, C. Clerbaux, C. Wespes, L. Clarisse, D. Hurtmans, S. Payan, C. Camy-Peyret, P. F. Coheur |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 20 ; Nr. 9, no. 20 (2009-10-21), S.7889-7899 |
| Datensatznummer |
250007698
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| Publikation (Nr.) |
 copernicus.org/acp-9-7889-2009.pdf |
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| Zusammenfassung |
| Although the global methane (CH4) concentration has more
than doubled since pre-industrial times, local emission sources are
still poorly identified and quantified. Instruments onboard satellites
can improve our knowledge about the methane global distribution owing
to their very good spatial coverage. The IASI (Infrared Atmospheric
Sounding Interferometer) instrument launched on the European MetOp-A
platform is a Fourier transform spectrometer which measures the
thermal infrared radiation emitted by the Earth and its atmosphere. In
this paper, we present the first global distribution of methane total
columns (mostly sensitive to the middle troposphere) from the IASI
spectra using the methane ν4 absorption band. The retrieval
spectral range was set in order to minimize possible spectroscopic
issues. Results are discussed in terms of error budget and vertical
sensitivity. In addition, we study the gain of information on surface
methane concentrations provided by using the ν3 band, which is
partly covered by IASI on the short-wave end of the spectra (extending
to 2760 cm−1), where solar reflection contributes significantly. |
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