Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-6983-2008
http://www.atmos-chem-phys-discuss.net/8/6983/2008/
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http://www.atmos-chem-phys-discuss.net/8/6983/2008/acpd-8-6983-2008.pdf
6983
7016
2008-04-09
Vertical profile of peroxyacetyl nitrate (PAN) from MIPAS-STR measurements over Brazil in February 2005 and the role of PAN in the UT tropical NO<sub>y</sub> partitioning
C. Keim
G. Y. Liu
C. E. Blom
H. Fischer
T. Gulde
M. Höpfner
michael.hoepfner@imk.fzk.de
C. Piesch
F. Ravegnani
A. Roiger
H. Schlager
N. Sitnikov
Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany
Institute of Atmospheric Sciences and Climate (ISAC-CNR) , Bologna, Italy
Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, Wessling, Germany
Central Aerological Observatory, Dolgoprudny, Moscow region, Russia
now at: Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) CNRS/ Univ. Paris 12 et 7, France
now at: Department of Earth and Atmospheric Science, City College of New York, USA
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 MIPAS-STR on board the Russian high altitude research
aircraft M55-Geophysica. The measurements were performed close to Araçatuba, Brazil, on 17 February 2005.
The retrieval was made in the spectral range 775–820 cm<sup>−1</sup> 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.
<br><br>
The retrieved profile of PAN has a maximum of about 0.14 ppbv at 10 km altitude, slightly larger than the
lowest reported values (<0.1 ppbv) and much lower than the highest (0.65 ppbv).
<br><br>
Besides the NO<sub>y</sub> constituents measured by MIPAS-STR (HNO<sub>3</sub>, ClONO<sub>2</sub>, PAN), the 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>+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.
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