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https://doi.org/10.5194/acpd-8-4499-2008
https://doi.org/10.5194/acpd-8-4499-2008

  04 Mar 2008

04 Mar 2008

Review status: this preprint was under review for the journal ACP. A revision for further review has not been submitted.

Validation of water vapour profiles from the Atmospheric Chemistry Experiment (ACE)

M. R. Carleer1, C. D. Boone2, K. A. Walker2,3, P. F. Bernath2,4, K. Strong3, R. J. Sica5, C. E. Randall6, H. Vömel7, J. Kar3, M. Höpfner8, M. Milz8,*, T. von Clarmann8, R. Kivi9, J. Valverde-Canossa10, C. E. Sioris11, M. R. M. Izawa12, E. Dupuy2, C. T. McElroy3,11, J. R. Drummond3,13, C. R. Nowlan3, J. Zou3, F. Nichitiu3, S. Lossow14, J. Urban15, D. Murtagh15, and D. G. Dufour16 M. R. Carleer et al.
  • 1Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium
  • 2Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
  • 3Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 4Department of Chemistry, University of York, UK
  • 5Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada
  • 6Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA
  • 7Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
  • 8Forschungszentrum Karlsruhe and Universität Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany
  • 9Finnish Meteorological Institute, Arctic Research Center, Sodankylä, Finland
  • 10Universidad Nacional, Heredia, Costa Rica
  • 11Environment Canada, Downsview, Ontario, Canada
  • 12Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada
  • 13Department of Physics & Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
  • 14Department of Meteorology, Stockholm University, Stockholm, Sweden
  • 15Department of Radio and Space Science, Chalmers University of Technology, Göteborg, Sweden
  • 16Picomole Instruments Inc., Edmonton, Alberta, Canada
  • *now at: Institutionen för Rymdvetenskap, Luleå Tekniska Universitet, Kiruna, Sweden

Abstract. The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Water vapour (H2O), one of the most important molecules for climate and atmospheric chemistry, is one of the key species provided by the two principal instruments, the infrared Fourier Transform Spectrometer (ACE-FTS) and the MAESTRO UV-Visible spectrometer (ACE-MAESTRO). The first instrument performs measurements on several lines in the 1362–2137 cm−1 range, from which vertically resolved H2O concentration profiles are retrieved, from 7 to 90 km altitude. ACE-MAESTRO measures profiles using the water absorption band in the near infrared part of the spectrum at 926.0–969.7 nm. This paper presents a comprehensive validation of the ACE-FTS profiles. We have compared the H2O volume mixing ratio profiles with space-borne (SAGE II, HALOE, POAM III, MIPAS, SMR) observations and measurements from balloon-borne frostpoint hygrometers and a ground based lidar. We show that the ACE-FTS measurements provide H2O profiles with small retrieval uncertainties in the stratosphere (better than 5% from 15 to 70 km, gradually increasing above). The situation is unclear in the upper troposphere, due mainly to the high variability of the water vapour volume mixing ratio in this region. A new water vapour data product from the ACE-MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) is also presented and initial comparisons with ACE-FTS are discussed.

M. R. Carleer et al.

 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

M. R. Carleer et al.

M. R. Carleer et al.

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