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Published July 19, 2010 | Published
Journal Article Open

Total column CO_2 measurements at Darwin, Australia – site description and calibration against in situ aircraft profiles

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 CO_2 and O_2 and other gases. Measured CO_2 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 X_(CO_2) relative to the World Meteorological Organization (WMO) calibrated in situ scale is within the uncertainties of the NIR spectroscopy and analysis.

Additional Information

© Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. Received: 3 March 2010; Published in Atmos. Meas. Tech. Discuss.: 17 March 2010; Revised: 26 May 2010; Accepted: 7 July 201; Published: 19 July 2010. We thank Rex Pearson, John Glowacki, Troy Culgan, Maciej Ryczek and Krzysztof Krzton for the maintenance of the solar FTS. We also gratefully acknowledge comments on the manuscript made by Janina Messerschmidt. Nicholas Deutscher is supported by an Australian Postgraduate Industry Award. The research described in this paper was performed for the Orbiting Carbon Observatory Project at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. TCCON is funded by the NASA terrestrial carbon cycle program, grant NNX08AI86G. This research is also assisted by Australian Research Council Projects DP0879468 and LP0562346 with the Australian Greenhouse Office. Edited by: I. Aben

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