edu.ucar.opensky::articles:6806 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:40:10.218224 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d70r9pnx Validation of MIPAS ClONO₂ measurements 2007-01-18T00:00:00Z publication https://n2t.org/ark:/85065/d70r9pnx https://doi.org/10.5194/acp-7-257-2007 Hopfner, M. author von Clarmann, T. author Fischer, H. author Funke, B. author Glatthor, N. author Grabowski, U. author Kellmann, S. author Kiefer, M. author Linden, A. author Milz, M. author Steck, T. author Stiller, G. author Bernath, P. author Blom, C. author Blumenstock, T. author Bonne, C. author Chance, K. author Coffey, Michael T. author Friedl-Vallon, F. author Griffith, D. author Hannigan, James W. author Hase, F. author Jones, N. author Jucks, K. author Keim, C. author Kleinert, A. author Kouker, W. author Liu, G. author Mahieu, E. author Mellqvist, J. author Mikuteit, S. author Notholt, J. author Oelhaf, H. author Piesch, C. author Reddmann, T. author Ruhnke, R. author Schneider, M. author Strandberg, A. author Toon, G. author Walker, K. author Warneke, T. author Wetzel, G. author Wood, S. author Zander, R. author UCAR/NCAR - Library publisher Altitude profiles of ClONO2 retrieved with the IMK (Institut für Meteorologie und Klimaforschung) science-oriented data processor from MIPAS/Envisat (Michelson Interferometer for Passive Atmospheric Sounding on Envisat) mid-infrared limb emission measurements between July 2002 and March 2004 have been validated by comparison with balloon-borne (Mark IV, FIRS2, MIPAS-B), airborne (MIPAS-STR), ground-based (Spitsbergen, Thule, Kiruna, Harestua, Jungfraujoch, Izaña, Wollongong, Lauder), and spaceborne (ACE-FTS) observations. With few exceptions we found very good agreement between these instruments and MIPAS with no evidence for any bias in most cases and altitude regions. For balloon-borne measurements typical absolute mean differences are below 0.05 ppbv over the whole altitude range from 10 to 39 km. In case of ACE-FTS observations mean differences are below 0.03 ppbv for observations below 26 km. Above this altitude the comparison with ACE-FTS is affected by the photochemically induced diurnal variation of ClONO&#x2082. Correction for this by use of a chemical transport model led to an overcompensation of the photochemical effect by up to 0.1 ppbv at altitudes of 30–35 km in case of MIPAS-ACE-FTS comparisons while for the balloon-borne observations no such inconsistency has been detected. The comparison of MIPAS derived total column amounts with ground-based observations revealed no significant bias in the MIPAS data. Mean differences between MIPAS and FTIR column abundances are 0.11±0.12×10¹⁴ cm^-2 (1.0±1.1%) and −0.09±0.19×10¹⁴ cm^-2 (−0.8±1.7%), depending on the coincidence criterion applied. x&#x00B2 tests have been performed to assess the combined precision estimates of MIPAS and the related instruments. When no exact coincidences were available as in case of MIPAS--FTIR or MIPAS--ACE-FTS comparisons it has been necessary to take into consideration a coincidence error term to account for x&#x00B2 deviations. From the resulting x&#x00B2 profiles there is no evidence for a systematic over/underestimation of the MIPAS random error analysis. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright Author(s) 2007. This work is distributed under the Creative Commons Attribution 3.0 License. None eng geoscientificInformation