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| Titel |
CH4, CO, and H2O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements |
| VerfasserIn |
A. Galli, A. Butz, R. A. Scheepmaker, O. Hasekamp, J. Landgraf, P. Tol, D. Wunch, N. M. Deutscher, G. C. Toon, P. O. Wennberg, D. W. T. Griffith, I. Aben |
| 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 ; 5, no. 6 ; Nr. 5, no. 6 (2012-06-19), S.1387-1398 |
| Datensatznummer |
250002972
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| Publikation (Nr.) |
 copernicus.org/amt-5-1387-2012.pdf |
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| Zusammenfassung |
The TROPOspheric Monitoring Instrument (TROPOMI) will be part of ESA's
Sentinel-5 Precursor (S5P) satellite platform scheduled for launch in 2015.
TROPOMI will monitor methane and carbon monoxide concentrations in the
Earth's atmosphere by measuring spectra of back-scattered sunlight in the
short-wave infrared (SWIR).
S5P will be the first satellite mission to rely uniquely on the spectral
window at 4190–4340 cm−1 (2.3 μm) to retrieve CH4 and CO.
In this study, we investigated if the absorption features of the three
relevant molecules CH4, CO, and H2O are adequately known. To this
end, we retrieved total columns of CH4, CO, and H2O from absorption
spectra measured by two ground-based Fourier transform spectrometers that are
part of the Total Carbon Column Observing Network (TCCON). The retrieval
results from the 4190–4340 cm−1 range at the TROPOMI resolution
(0.45 cm−1) were then compared to the CH4 results obtained from
the 6000 cm−1 region, and the CO results obtained from the
4190–4340 cm−1 region at the higher TCCON resolution (0.02 cm−1).
For TROPOMI-like settings, we were able to reproduce the CH4 columns to
an accuracy of 0.3% apart from a constant bias of 1%. The CO retrieval
accuracy was, through interference, systematically influenced by the
shortcomings of the CH4 and H2O spectroscopy. In contrast to
CH4, the CO column error also varied significantly with atmospheric
H2O content. Unaddressed, this would introduce seasonal and latitudinal
biases to the CO columns retrieved from TROPOMI measurements. We therefore
recommend further effort from the spectroscopic community to be directed at
the H2O and CH4 spectroscopy in the 4190–4340 cm−1 region. |
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