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| Titel |
Validation of nitric acid retrieved by the IMK-IAA processor from MIPAS/ENVISAT measurements |
| VerfasserIn |
D. Y. Wang, M. Höpfner, G. Mengistu Tsidu, G. P. Stiller, T. Clarmann, H. Fischer, T. Blumenstock, N. Glatthor, U. Grabowski, F. Hase, S. Kellmann, A. Linden, M. Milz, H. Oelhaf, M. Schneider, T. Steck, G. Wetzel, M. López-Puertas, B. Funke, M. E. Koukouli, H. Nakajima, T. Sugita, H. Irie, J. Urban, D. Murtagh, M. L. Santee, G. Toon, M. R. Gunson, F. W. Irion, C. D. Boone, K. Walker, P. F. Bernath |
| 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. 3 ; Nr. 7, no. 3 (2007-02-14), S.721-738 |
| Datensatznummer |
250004561
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| Publikation (Nr.) |
 copernicus.org/acp-7-721-2007.pdf |
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| Zusammenfassung |
| The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard
the ENVISAT satellite provides profiles of temperature and various
trace-gases from limb-viewing mid-infrared emission measurements. The
stratospheric nitric acid (HNO3) from September 2002 to March 2004
was retrieved from the MIPAS observations using the science-oriented data
processor developed at the Institut für Meteorologie und Klimaforschung
(IMK), which is complemented by the component of non-local thermodynamic
equilibrium (non-LTE) treatment from the Instituto de Astrofísica de
Andalucía (IAA). The IMK-IAA research product, different from the ESA
operational product, is validated in this paper by comparison with a number
of reference data sets. Individual HNO3 profiles of the IMK-IAA MIPAS
show good agreement with those of the balloon-borne version of MIPAS
(MIPAS-B) and the infrared spectrometer MkIV, with small differences of less
than 0.5 ppbv throughout the entire altitude range up to about 38 km, and below 0.2 ppbv above 30 km. However, the degree
of consistency is largely affected by their temporal and spatial coincidence,
and differences of 1 to 2 ppbv may be observed between 22 and 26 km at high latitudes near the vortex boundary, due to large horizontal
inhomogeneity of HNO3. Statistical comparisons of MIPAS IMK-IAA
HNO3 VMRs with respect to those of satellite measurements of
Odin/SMR, ILAS-II, ACE-FTS, as well as the MIPAS ESA product show good
consistency. The mean differences are generally ±0.5 ppbv and
standard deviations of the differences are of 0.5 to 1.5 ppbv. The
maximum differences are 2.0 ppbv around 20 to 25 km. This gives
confidence in the general reliability of MIPAS HNO3 VMR data and the
other three satellite data sets. |
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