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Volume 5, issue 2 | Copyright

Special issue: Validation of water vapor measurements during MOHAVE-2009

Atmos. Meas. Tech., 5, 289-320, 2012
https://doi.org/10.5194/amt-5-289-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 02 Feb 2012

Research article | 02 Feb 2012

Validation of MIPAS IMK/IAA temperature, water vapor, and ozone profiles with MOHAVE-2009 campaign measurements

G. P. Stiller1, M. Kiefer1, E. Eckert1, T. von Clarmann1, S. Kellmann1, M. García-Comas2, B. Funke2, T. Leblanc3, E. Fetzer4, L. Froidevaux4, M. Gomez10, E. Hall5,6, D. Hurst5,6, A. Jordan5,6, N. Kämpfer7, A. Lambert4, I. S. McDermid3, T. McGee8, L. Miloshevich9, G. Nedoluha10, W. Read4, M. Schneider1, M. Schwartz4, C. Straub7, G. Toon4, L. W. Twigg11, K. Walker12, and D. N. Whiteman8 G. P. Stiller et al.
  • 1Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
  • 2Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain
  • 3Caltech/Jet Propulsion Laboratory, Wrightwood, California, USA
  • 4Caltech/Jet Propulsion Laboratory, Pasadena, California, USA
  • 5NOAA Earth System Research Laboratory, Global Monitoring Division, Boulder, Colorado, USA
  • 6CIRES, University of Colorado, Boulder, Colorado, USA
  • 7Institute of Applied Physics, University of Bern, Bern, Switzerland
  • 8Laboratory for Atmospheres, Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 9Milo Scientific LLC, Lafayette, Colorado, USA
  • 10Naval Research Laboratory, Washington, D.C., USA
  • 11Science Systems and Applications, Inc., Lanham, Maryland, USA
  • 12Department of Physics, University of Toronto, Ontario, Canada

Abstract. MIPAS observations of temperature, water vapor, and ozone in October 2009 as derived with the scientific level-2 processor run by Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK) and CSIC, Instituto de Astrofísica de Andalucía (IAA) and retrieved from version 4.67 level-1b data have been compared to co-located field campaign observations obtained during the MOHAVE-2009 campaign at the Table Mountain Facility near Pasadena, California in October 2009. The MIPAS measurements were validated regarding any potential biases of the profiles, and with respect to their precision estimates. The MOHAVE-2009 measurement campaign provided measurements of atmospheric profiles of temperature, water vapor/relative humidity, and ozone from the ground to the mesosphere by a suite of instruments including radiosondes, ozonesondes, frost point hygrometers, lidars, microwave radiometers and Fourier transform infra-red (FTIR) spectrometers. For MIPAS temperatures (version V4O_T_204), no significant bias was detected in the middle stratosphere; between 22 km and the tropopause MIPAS temperatures were found to be biased low by up to 2 K, while below the tropopause, they were found to be too high by the same amount. These findings confirm earlier comparisons of MIPAS temperatures to ECMWF data which revealed similar differences. Above 12 km up to 45 km, MIPAS water vapor (version V4O_H2O_203) is well within 10% of the data of all correlative instruments. The well-known dry bias of MIPAS water vapor above 50 km due to neglect of non-LTE effects in the current retrievals has been confirmed. Some instruments indicate that MIPAS water vapor might be biased high by 20 to 40% around 10 km (or 5 km below the tropopause), but a consistent picture from all comparisons could not be derived. MIPAS ozone (version V4O_O3_202) has a high bias of up to +0.9 ppmv around 37 km which is due to a non-identified continuum like radiance contribution. No further significant biases have been detected. Cross-comparison to co-located observations of other satellite instruments (Aura/MLS, ACE-FTS, AIRS) is provided as well.

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