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Pollution trace gas distributions and their transport in the Asian monsoon upper troposphere and lowermost stratosphere during the StratoClim campaign 2017

Johansson, Sören; Höpfner, Michael; Kirner, Oliver; Wohltmann, Ingo; Bucci, Silvia; Legras, Bernard; Friedl-Vallon, Felix; Glatthor, Norbert; Kretschmer, Erik; Ungermann, Jörn; Wetzel, Gerald

Abstract:
We present the first high-resolution measurements of pollutant trace gases in the Asian summer monsoon upper troposphere and lowermost stratosphere (UTLS) from the Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) during the StratoClim (Stratospheric and upper tropospheric processes for better climate predictions) campaign based in Kathmandu, Nepal, 2017. Measurements of peroxyacetyl nitrate (PAN), acetylene (C$_2$H$_2$), and formic acid (HCOOH) show strong local enhancements up to altitudes of 16\,km. More than 500\,pptv of PAN, more than 200\,pptv of C$_2$H$_2$, and more than 200\,pptv of HCOOH are observed. Air masses with increased volume mixing ratios of PAN and C$_2$H$_2$ at altitudes up to 18\,km, reaching to the lowermost stratosphere, were present at these altitudes for more than 10\,d, as indicated by trajectory analysis. A local minimum of HCOOH is correlated with a previously reported maximum of ammonia (NH$_3$), which suggests different washout efficiencies of these species in the same air masses. A backward trajectory analysis based on the models Alfred Wegener InsTitute LAgrangian Chemistry/Transport System (ATLAS) and TRACZILLA, using advanced techniques for detection of convective events, and starting at geolocations of GLORIA measurements with enhanced pollution trace gas concentrations, has been performed. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000127090
Veröffentlicht am 07.12.2020
Originalveröffentlichung
DOI: 10.5194/acp-20-14695-2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Steinbuch Centre for Computing (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 02.12.2020
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000127090
HGF-Programm 12.04.03 (POF III, LK 01) Stratospheric Ozone and Climate Change
Weitere HGF-Programme 46.11.01 (POF III, LK 01) Computational Science and Mathematical Methods
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 20
Heft 23
Seiten 14695–14715
Projektinformation StratoClim (EU, FP7, 603557)
Vorab online veröffentlicht am 19.06.2020
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