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Discussion papers
https://doi.org/10.5194/essd-2018-161
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2018-161
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 09 Jan 2019

Research article | 09 Jan 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

Satellite and Ground-based Measurements of XCO2 in a Remote Semi-Arid Region of Australia

Voltaire A. Velazco1, Nicholas M. Deutscher1, Isamu Morino2, Osamu Uchino2, Beata Bukosa1, Masataka Ajiro2, Akihide Kamei2, Nicholas B. Jones1, Clare Paton-Walsh1, and David W. T. Griffith1 Voltaire A. Velazco et al.
  • 1Centre for Atmospheric Chemistry, School of Chemistry, University of Wollongong, Northfields Ave. Wollongong NSW 2522 Australia
  • 2Satellite Observation Center, National Institute for Environmental Studies (NIES), Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan

Abstract. In this study, we present ground-based measurements of column-averaged dry-air mole fractions (DMFs) of CO2 (or XCO2) from an EM27/SUN portable spectrometer, equipped with an automated clam shell cover, taken in a semi-arid region of Australia. We compared these measurements to space-based XCO2 retrievals from the Greenhouse Gases Observing Satellite (GOSAT). Side-by-side measurements of EM27/SUN with the Total Carbon Column Observing Network (TCCON) instrument at the University of Wollongong were conducted in 2015–2016 to derive an XCO2 calibration factor of 0.9954 relative to TCCON. Although we found a slight drift of .0125% per month in the calibration curve of the EM27/SUN vs TCCON XCO2, the alignment of the EM27/SUN proved stable enough for a campaign, keeping the retrieved Xair values, a measure of stability, to within 0.5% and the modulation efficiency to within 2%. From the measurements in Alice Springs, we confirm a small bias of around 2ppm in the GOSAT M-gain to H-gain XCO2 retrievals, as reported by the NIES GOSAT validation team. Based on the reported random errors from GOSAT, we estimate the required duration of a future campaign in order to improve the estimated bias between the EM27/SUN and GOSAT. The dataset from the Alice Springs measurements is accessible at http://dx.doi.org/10.4225/48/5b21f16ce69bc (Velazco et al., 2018).

Voltaire A. Velazco et al.
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Voltaire A. Velazco et al.
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Column averaged dry mole fractions of carbon dioxide in Alice Springs, Australia V. A. Velazco, N. M. Deutscher, and D. W. T. Griffith https://doi.org/10.4225/48/5b21f16ce69bc

Voltaire A. Velazco et al.
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Short summary
We present ground-based measurements of atmospheric carbon dioxide columns from a portable spectrometer taken in a semi-arid region of Australia. We compared these measurements to space-based retrievals from the Greenhouse Gases Observing Satellite (GOSAT) and calibrated them against a Total Carbon Column Observing Network (TCCON) instrument to ascertain a retrieval bias. We also present the unique opportunities that Central Australia could offer in the context of satellite product validation.
We present ground-based measurements of atmospheric carbon dioxide columns from a portable...
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