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Vertical profile of peroxyacetyl nitrate (PAN) from MIPAS-STR measurements over Brazil in February 2005 and its contribution to tropical UT NOy partitioning

Keim, C. and Liu, G.Y. and Blom, C.E. and Fischer, H. and Gulde, T. and Höpfner, M. and Piesch, C. and Ravegnani, F. and Roiger, A. and Schlager, H. and Sitnikov, N. (2008) Vertical profile of peroxyacetyl nitrate (PAN) from MIPAS-STR measurements over Brazil in February 2005 and its contribution to tropical UT NOy partitioning. Atmospheric Chemistry and Physics, 8, pp. 4891-4902.

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Official URL: http://www.cosis.net/members/journals/df/volumes.php?j_id=2

Abstract

We report on the retrieval of PAN (CH<sub>3</sub>C(O)OONO<sub>2</sub>) in the upper tropical troposphere from limb measurements by the remote-sensor MIPASSTR on board the Russian high altitude research aircraft M55-Geophysica. The measurements were performed close to Arac¸atuba, Brazil, on 17 February 2005. The retrieval was made in the spectral range 775–820 cm−1 where PAN exhibits its strongest feature but also more than 10 species interfere. Especially trace gases such as CH<sub>3</sub>CCl<sub>3</sub>, CFC- 113, CFC-11, and CFC-22, emitting also in spectrally broad not-resolved branches, make the processing of PAN prone to errors. Therefore, the selection of appropriate spectral windows, the separate retrieval of several interfering species and the careful handling of the water vapour profile are part of the study presented. The retrieved profile of PAN has a maximum of about 0.14 ppbv at 10 km altitude, slightly larger than the lowest reported values (.lt. 0.1 ppbv) and much lower than the highest reported in the literature (0.65 ppbv). Besides the NOy constituents measured by MIPAS-STR (HNO<sub>3</sub>, ClONO<sub>2</sub>, O<sub>2</sub>NO<sub>2</sub>, PAN), the in situ instruments aboard the Geophysica provide simultaneous measurements of NO, NO<sub>2</sub>, and the sum NO<sub>y</sub>. Comparing the sum of in-situ and remotely derived NO+NO<sub>2</sub>+HNO<sub>3</sub>+ClONO<sub>2</sub> +HO<sub>2</sub>NO<sub>2</sub>+PAN with total NO<sub>y</sub> a deficit of 30–40% (0.2–0.3 ppbv) in the troposphere remains unexplained whereas the values fit well in the stratosphere.

Document Type:Article
Title:Vertical profile of peroxyacetyl nitrate (PAN) from MIPAS-STR measurements over Brazil in February 2005 and its contribution to tropical UT NOy partitioning
Authors:
AuthorsInstitution or Email of Authors
Keim, C.FZ Karlsruhe, Karlsruhe
Liu, G.Y.FZ Karlsruhe, Karlsruhe
Blom, C.E.FZ Karlsruhe, Karlsruhe
Fischer, H.FZ Karlsruhe, Karlsruhe
Gulde, T.FZ Karlsruhe, Karlsruhe
Höpfner, M.FZ Karlsruhe, Karlsruhe
Piesch, C.FZ Karlsruhe, Karlsruhe
Ravegnani, F.ISAC-CNR, Bologna, I
Roiger, A.UNSPECIFIED
Schlager, H.UNSPECIFIED
Sitnikov, N.Central Aerological Observatory, Dolgoprudny, R
Date:2008
Journal or Publication Title:Atmospheric Chemistry and Physics
Volume:8
Page Range:pp. 4891-4902
Status:Published
Keywords:tropical composition, reactive nitrogen, peroxyacetylnitrate (PAN), MIPAS-STR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Air Traffic and Weather (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:18 Sep 2008
Last Modified:12 Dec 2013 20:32

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