References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-4891-2008

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

Keim

¹ ⁵ Liu

G. Y.

¹ ⁶ Blom

C. E.

¹ Fischer

¹ Gulde

¹ Höpfner

¹ Piesch

¹ Ravegnani

² Roiger

³ Schlager

³ Sitnikov

⁴

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

26 08 2008

8 16 4891 4902

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We report on the retrieval of PAN (CH3C(O)OONO2) 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−1 where PAN exhibits its strongest feature but also more than 10 species interfere. Especially trace gases such as CH3CCl3, 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 (<0.1 ppbv) and much lower than the highest reported in the literature (0.65 ppbv). Besides the NOy constituents measured by MIPAS-STR (HNO3, ClONO2, HO2NO2, PAN), the in situ instruments aboard the Geophysica provide simultaneous measurements of NO, NO2, and the sum NOy. Comparing the sum of in-situ and remotely derived NO+NO2+HNO3+ClONO2+HO2NO2+PAN with total NOy 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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