ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-24233-2011 On the quality of MIPAS kinetic temperature in the middle atmosphere García-Comas M. 1 Funke B. 1 López-Puertas M. 1 Bermejo-Pantaleón D. 1 Glatthor N. 2 von Clarmann T. 2 Stiller G. 2 Grabowski U. 2 Boone C. D. 3 French W. J. R. 4 Leblanc T. 5 López-González M. J. 1 Schwartz M. J. 6 Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain Karlsruhe Institut für Technologie, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany Univ. of Waterloo, Waterloo, Ontario, Canada Australian Antarctic Division, Kingston, Tasmania, Australia California Institute of Technology, Jet Propulsion Laboratory, Wrightwood, CA, USA Jet Propulsion Laboratory, Pasadena, CA, USA 30 08 2011 11 8 24233 24312 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/11/24233/2011/acpd-11-24233-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/24233/2011/acpd-11-24233-2011.pdf

The kinetic temperature and line of sight elevation information are retrieved from the MIPAS Middle Atmosphere (MA), Upper Atmosphere (UA) and NoctiLucent-Cloud (NLC) modes of high spectral resolution limb observations of the CO<sub>2</sub> 15 μm emission using the dedicated IMK/IAA retrieval algorithm, which considers non-local thermodynamic equilibrium conditions. These variables are accurately derived from about 20 km (MA) and 40 km (UA and NLC) to 105 km globally and both at daytime and nighttime. Typical temperature random errors are smaller than 0.5 K below 50 km, 0.5–2 K at 50–70 km, and 2–8 K above. The systematic error is typically 1 K below 70 km, 1–3 K from 70 to 85 km and 3–11 K from 85 to 100 km. The average vertical resolution is typically 4 km below 35 km, 3 km at 35–50 km, 4–6 km at 50–90 km, and 6–10 km above. We compared our MIPAS temperature retrievals from 2005 to 2009 with co-located ground-based measurements from the lidars located at the Table Mountain Facility and Mauna Loa Observatory, the SATI spectrograph in Granada (Spain) and the Davis station spectrometer, and satellite observations from ACE-FTS, Aura-MLS and TIMED-SABER from 20 km to 100 km. We also compared MIPAS temperatures with the high latitudes climatology from falling sphere measurements. The comparisons show very good agreement, with differences smaller than 3 K below 85–90 km in mid-latitudes. Differences over the poles in this altitude range are larger but can be generally explained in terms of known biases of the other instruments. The comparisons above 90 km worsen and MIPAS retrieved temperatures are always larger than other instrument measurements.

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