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| Titel |
The abundance, shape and chemical composition of non-volatile particles in the Arctic winter Stratosphere and their potential activation by Polar Stratospheric Cloud elements. |
| VerfasserIn |
Ralf Weigel, Martin Ebert, Sergej Molleker, Wiebke Frey, Gebhard Günther, C. Michael Volk, Hans Schlager, Francesco Cairo, Guido Di Donfrancesco, Stephan Borrmann |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052007
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| Zusammenfassung |
| Earlier studies showed elevated fractions of non-volatile particles of up to 75Â % in the Arctic
vortex stratosphere between 400Â -Â 500Â K potential temperature (Î) compared to ~Â 25Â %
outside of the vortex (Curtius, J., et al., Atmos. Chem. Phys., 2005), or elsewhere (Borrmann,
S., et al., Atmos. Chem. Phys., 2010). It was assumed that refractory smoke material from
meteoritic burn-up, accumulated in the mesosphere (Strelnikova, I., PhD thesis, University
Rostock, 2009), enters the polar vortex with subsiding air over the winter pole (Curtius, J., et
al., Atmos. Chem. Phys., 2005).
Aerosol measurements with the COPAS Condensation Particle Counters (CPCs) (Weigel,
R., et al., Atmos. Meas. Tech., 2009) were performed on board the research aircraft M-55
“Geophysica” during the RECONCILE mission (funded under the EC Seventh Framework
Program), in- and outside the Arctic vortex, during spring 2010. COPAS measures ambient
particle number concentrations from nucleation mode size up to a few μm in diameter (dp) –
one COPAS channel measures downstream of a heated (250Ë C) aerosol line the number of
non volatile particles. Additionally, particles were sampled with a miniaturized
dual-stage impactor (Kandler, K., et al., Atmos. Environ., 2007) for offline single
particle analysis using Environmental Scanning Electron Microscopy and Energy
Dispersive X-ray analysis methods. One impactor sample per flight (size range
0.15Â |
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