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| Titel |
Validation of MIPAS ClONO2 measurements |
| VerfasserIn |
M. Höpfner, T. Clarmann, H. Fischer, B. Funke, N. Glatthor, U. Grabowski, S. Kellmann, M. Kiefer, A. Linden, M. Milz, T. Steck, G. P. Stiller, P. Bernath, C. E. Blom, Th. Blumenstock, C. Boone, K. Chance, M. T. Coffey, F. Friedl-Vallon, D. Griffith, J. W. Hannigan, F. Hase, N. Jones, K. W. Jucks, C. Keim, A. Kleinert, W. Kouker, G. Y. Liu, E. Mahieu, J. Mellqvist, S. Mikuteit, J. Notholt, H. Oelhaf, C. Piesch, T. Reddmann, R. Ruhnke, M. Schneider, A. Strandberg, G. Toon, K. A. Walker, T. Warneke, G. Wetzel, S. Wood, R. Zander |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 1 ; Nr. 7, no. 1 (2007-01-18), S.257-281 |
| Datensatznummer |
250004359
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| Publikation (Nr.) |
 copernicus.org/acp-7-257-2007.pdf |
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| Zusammenfassung |
| 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 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±0.12×1014 cm−2 (1.0±1.1%)
and −0.09±0.19×1014 cm−2 (−0.8±1.7%), depending on
the coincidence criterion applied. χ2 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 χ2 deviations. From the resulting
χ2 profiles there is no evidence for a systematic over/underestimation
of the MIPAS random error analysis. |
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