Articles | Volume 3, issue 4
Atmos. Meas. Tech., 3, 947–958, 2010
https://doi.org/10.5194/amt-3-947-2010
Atmos. Meas. Tech., 3, 947–958, 2010
https://doi.org/10.5194/amt-3-947-2010

  19 Jul 2010

19 Jul 2010

Total column CO2 measurements at Darwin, Australia – site description and calibration against in situ aircraft profiles

N. M. Deutscher1, D. W. T. Griffith1, G. W. Bryant*,1, P. O. Wennberg3,2, G. C. Toon4, R. A. Washenfelder3, G. Keppel-Aleks3, D. Wunch3,2, Y. Yavin2, N. T. Allen5, J.-F. Blavier4, R. Jiménez5,6, B. C. Daube5,6, A. V. Bright5,6, D. M. Matross5,6,***, S. C. Wofsy5,6, and S. Park5,6 N. M. Deutscher et al.
  • 1School of Chemistry, University of Wollongong, Northfields Ave, Wollongong, NSW, 2522, Australia
  • 2Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA, 91125, USA
  • 3Division of Engineering and Applied Science, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA, 91125, USA
  • 4Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
  • 5School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
  • 6Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, 02138, USA
  • *now at: Centre for Organic Electronic, University of Newcastle, NSW, Australia
  • **now at: Chemical Sciences Division, Earth System Research Laboratory, NOAA, 325 Broadway St, Boulder, CO, 80305, USA
  • ***now at: Sustainable Market Strategies Group, KEMA Inc, Oakland, CA, USA

Abstract. An automated Fourier Transform Spectroscopic (FTS) solar observatory was established in Darwin, Australia in August 2005. The laboratory is part of the Total Carbon Column Observing Network, and measures atmospheric column abundances of CO2 and O2 and other gases. Measured CO2 columns were calibrated against integrated aircraft profiles obtained during the TWP-ICE campaign in January–February 2006, and show good agreement with calibrations for a similar instrument in Park Falls, Wisconsin. A clear-sky low airmass relative precision of 0.1% is demonstrated in the CO2 and O2 retrieved column-averaged volume mixing ratios. The 1% negative bias in the FTS XCO2 relative to the World Meteorological Organization (WMO) calibrated in situ scale is within the uncertainties of the NIR spectroscopy and analysis.

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