Full-physics carbon dioxide retrievals from the Orbiting Carbon Observatory-2 (OCO-2) satellite by only using the 2.06 [mu]m band
<p><strong>Abstract.</strong> Passive remote sensing of atmospheric carbon dioxide uses spectroscopic measurements of sunlight backscattered by the Earth's surface and atmosphere. The current state-of-the-art retrieval methods use three different spectral bands, the oxygen A b...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
21 November 2019
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| In: |
Atmospheric measurement techniques
Year: 2019, Jahrgang: 12, Heft: 11, Pages: 6049-6058 |
| ISSN: | 1867-8548 |
| DOI: | https://doi.org/10.5194/amt-12-6049-2019 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/https://doi.org/10.5194/amt-12-6049-2019 Verlag: https://www.atmos-meas-tech.net/12/6049/2019/ 
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| Verfasserangaben: | Lianghai Wu, Otto Hasekamp, Haili Hu, Joost aan de Brugh, Jochen Landgraf, Andre Butz, and Ilse Aben |
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| 520 | |a <p><strong>Abstract.</strong> Passive remote sensing of atmospheric carbon dioxide uses spectroscopic measurements of sunlight backscattered by the Earth's surface and atmosphere. The current state-of-the-art retrieval methods use three different spectral bands, the oxygen A band at <span class="inline-formula">0.76</span> <span class="inline-formula">µ</span>m and the weak and strong <span class="inline-formula">CO<sub>2</sub></span> absorption bands at <span class="inline-formula">1.61</span> and <span class="inline-formula">2.06</span> <span class="inline-formula">µ</span>m, respectively, to infer information on light scattering and the carbon dioxide column-averaged dry-air mole fraction <span class="inline-formula"><i>X</i>CO<sub>2</sub></span>. In this study, we propose a one-band <span class="inline-formula"><i>X</i>CO<sub>2</sub></span> retrieval technique which uses only the <span class="inline-formula">2.06</span> <span class="inline-formula">µ</span>m band measurements from the Orbiting Carbon Observatory-2 (OCO-2) satellite. We examine the data quality by comparing the OCO-2 <span class="inline-formula"><i>X</i>CO<sub>2</sub></span> with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON). Over land and ocean the OCO-2 one-band retrieval shows differences from TCCON observations with a standard deviation of <span class="inline-formula">∼1.30</span> ppm and a station-to-station variability of <span class="inline-formula">∼0.50</span> ppm. Moreover, we compare one-band and three-band retrievals over Europe, the Middle East, and Africa and see high correlation between the two retrievals with a SD of <span class="inline-formula">0.93</span> ppm. Compared to the three-band retrievals, <span class="inline-formula"><i>X</i>CO<sub>2</sub></span> retrievals using only the <span class="inline-formula">2.06</span> <span class="inline-formula">µ</span>m band have similar retrieval accuracy, precision, and data yield.</p> | ||
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