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| Titel |
Spectroscopic Line Parameters of Methane Around 6000 cm-1 |
| VerfasserIn |
Victor Gorshelev, Anna Serdyuchenko, Michael Buchwitz, John Burrows, Neil Humpage, John Remedios |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080130
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| Zusammenfassung |
| Methane (CH4) is one of the most important greenhouse gases, also being modified by
anthropogenic activity. Nowadays, it can be monitored globally from space on the long-term
scale using combinations of different remote sensing instruments. The critical point for the
retrieval algorithms is the knowledge of the spectroscopic parameters. Although a
significant amount of spectroscopic data on CH4 is available, the information on the
line parameters in mid infrared (MIR) spectral region is inadequate for accurate
remote sensing applications and there is a need for improved spectroscopic line
parameters.
We report on the improved spectroscopic line parameters for CH4 in the spectral regions used
by SCIAMACHY and TANSO instruments around 6000 cm-1.
New data were obtained using high resolution absorption spectra of CH4, perturbed by
oxygen, nitrogen and air. Spectra were measured using Fourier transform spectrometer in a
broad range of total pressures from 2 to 1000 mbar and temperatures down to 196 K.
Calculations of broadening parameters were performed using Reference Forward Model
assuming Voigt line profile within international collaboration between the Molecular
Spectroscopy Laboratory in IUP Bremen, and Earth Observation Science Group, University
of Leicester, UK. Accuracy of the new data matches the level of the demands of modern
datasets and remote sensing. The new data were compared with the data included in the latest
HITRAN edition and other published works. Before release for the general scientific
community, the new data was tested on the TANSO and SCIAMACHY retrievals. |
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