References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-7-721-2007

Validation of nitric acid retrieved by the IMK-IAA processor from MIPAS/ENVISAT measurements

Wang

D. Y.

¹ ² Höpfner

¹ Mengistu Tsidu

¹ ³ Stiller

G. P.

¹ von Clarmann

¹ Fischer

¹ Blumenstock

¹ Glatthor

¹ Grabowski

¹ Hase

¹ Kellmann

¹ Linden

¹ Milz

¹ Oelhaf

¹ Schneider

¹ Steck

¹ Wetzel

¹ López-Puertas

⁴ Funke

⁴ Koukouli

M. E.

⁴ ⁵ Nakajima

⁶ Sugita

⁶ Irie

⁷ Urban

⁸ Murtagh

⁸ Santee

M. L.

⁹ Toon

⁹ Gunson

M. R.

⁹ Irion

F. W.

⁹ Boone

C. D.

¹⁰ Walker

¹⁰ Bernath

P. F.

¹⁰

Forschungszentrum Karlsruhe und Univ. Karlsruhe, Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

Physics Department, University of New Brunswick, Fredericton, New Brunswick, Canada

Department of Physics, Addis Ababa University, Addis Ababa, Ethiopia

Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain

Physics Department, Aristotle University of Thessaloniki, Thessaloniki, Greece

National Institute for Environmental Studies, Tsukuba, Japan

Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan

Chalmers Uni. of Technology, Department of Radio and Space Science, Göteborg, Sweden

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada

14 02 2007

7 3 721 738

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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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