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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-218
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-218
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 18 Jun 2019

Research article | 18 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Full-physics carbon dioxide retrievals from the OCO-2 satellite by only using the 2.06 μm band

Lianghai Wu1, Otto Hasekamp1, Haili Hu1, Joost aan de Brugh1, Jochen Landgraf1, Andre Butz2, and Ilse Aben1 Lianghai Wu et al.
  • 1SRON Netherlands Institute for Space Research, Utrecht, the Netherlands
  • 2Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany

Abstract. Passive remote sensing of atmospheric carbon dioxide uses spectroscopic measurements of sunlight back-scattered 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 0.76 μm and the weak and strong CO2 absorption bands at 1.61 and 2.06 μm, respectively, to infer information on light scattering and the carbon dioxide column-averaged dry-air mole fraction XCO2. In this study, we propose a one-band XCO2 retrieval technique which uses only the 2.06 μm band measurements from the OCO-2 satellite. We examine the data quality by comparing the OCO-2 XCO2 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 to TCCON observations with a standard deviation of ~ 1.30 ppm and a station-to-station variability of ~ 0.50 ppm. Moreover, we compare one-band and three-band retrievals over Europe,the Middle East and Africa region and see high correlation between the two retrievals with a SD of 0.93 ppm. Compared to the three-band retrievals, using only the 2.06 μm band similar XCO2 retrieval accuracy and precision can be obtained while retaining a similar data yield.

Lianghai Wu et al.
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Status: open (until 13 Aug 2019)
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