Article (Scientific journals)
Validation of MIPAS ClONO2 measurements
Hopfner, Michael; von Clarmann, Thomas; Fischer, H. et al.
2007In Atmospheric Chemistry and Physics, 7, p. 257-281
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Keywords :
validation; MIPAS; chlorine reservoir; chlorine nitrate
Abstract :
[en] Altitude profiles of ClONO2 retrieved with the IMK (Institut fur 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, Izana, 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 ClONO2. 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 x 10(14) cm(-2) (1.0 +/- 1.1%) and -0.09 +/- 0.19 x 10(14) cm(-2) (-0.8 +/- 1.7%), depending on the coincidence criterion applied. chi(2) 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 chi(2) deviations. From the resulting chi(2) profiles there is no evidence for a systematic over/underestimation of the MIPAS random error analysis.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Hopfner, Michael
von Clarmann, Thomas
Fischer, H.
Funke, B.
Glatthor, N.
Grabowski, Udo
Kellmann, S.
Kiefer, M.
Linden, Andrea
Milz, M.
Steck, T.
Stiller, G. P.
Bernath, Peter
Blom, C. E.
Blumenstock, Thomas
Boone, Christopher D.
Chance, Kelly
Coffey, M. T.
Friedl-Vallon, F.
Griffith, David
Hannigan, James W.
Hase, Frank
Jones, Nicholas
Jucks, Ken W.
Keim, C.
Kleinert, A.
Kouker, W.
Liu, G. Y.
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Mellqvist, Johan
Mikuteit, Sabine
Notholt, Justus
Oelhaf, H.
Piesch, C.
Reddmann, T.
Ruhnke, Roland
Schneider, Matthias
Strandberg, Anders
Toon, Geoffrey
Walker, Kaley A.
Warneke, Thorsten
Wetzel, G.
Wood, Stephen
Zander, Rodolphe ;  Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
More authors (34 more) Less
Language :
English
Title :
Validation of MIPAS ClONO2 measurements
Publication date :
18 January 2007
Journal title :
Atmospheric Chemistry and Physics
ISSN :
1680-7316
eISSN :
1680-7324
Publisher :
European Geosciences Union, Katlenburg-Lindau, Germany
Volume :
7
Pages :
257-281
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 December 2008

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