CH4, CO, and H2O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements
<p><strong>Abstract.</strong> 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 me...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
19 June 2012
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| In: |
Atmospheric measurement techniques
Year: 2012, Jahrgang: 5, Heft: 6, Pages: 1387-1398 |
| ISSN: | 1867-8548 |
| DOI: | 10.5194/amt-5-1387-2012 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.5194/amt-5-1387-2012 Verlag, Volltext: https://www.atmos-meas-tech.net/5/1387/2012/ 
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| Verfasserangaben: | 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, and I. Aben |
| Zusammenfassung: | <p><strong>Abstract.</strong> 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). <br><br> S5P will be the first satellite mission to rely uniquely on the spectral window at 4190-4340 cm<sup>−1</sup> (2.3 μm) to retrieve CH<sub>4</sub> and CO. In this study, we investigated if the absorption features of the three relevant molecules CH<sub>4</sub>, CO, and H<sub>2</sub>O are adequately known. To this end, we retrieved total columns of CH<sub>4</sub>, CO, and H<sub>2</sub>O 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<sup>−1</sup> range at the TROPOMI resolution (0.45 cm<sup>−1</sup>) were then compared to the CH<sub>4</sub> results obtained from the 6000 cm<sup>−1</sup> region, and the CO results obtained from the 4190-4340 cm<sup>−1</sup> region at the higher TCCON resolution (0.02 cm<sup>−1</sup>). <br><br> For TROPOMI-like settings, we were able to reproduce the CH<sub>4</sub> 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 CH<sub>4</sub> and H<sub>2</sub>O spectroscopy. In contrast to CH<sub>4</sub>, the CO column error also varied significantly with atmospheric H<sub>2</sub>O 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 H<sub>2</sub>O and CH<sub>4</sub> spectroscopy in the 4190-4340 cm<sup>−1</sup> region.</p> |
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| Beschreibung: | Im Titel sind "4“ und "2" tiefgestellt Gesehen am 15.01.2019 |
| Beschreibung: | Online Resource |
| ISSN: | 1867-8548 |
| DOI: | 10.5194/amt-5-1387-2012 |