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  Nitric acid trihydrate nucleation and denitrification in the Arctic stratosphere

Grooß, J.-U., Engel, I., Borrmann, S., Frey, W., Günther, G., Hoyle, C. R., et al. (2014). Nitric acid trihydrate nucleation and denitrification in the Arctic stratosphere. Atmospheric Chemistry and Physics, 14(2), 1055-1073. doi:10.5194/acp-14-1055-2014.

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Grooß, J.-U.1, Autor
Engel, I.1, Autor
Borrmann, S.2, Autor           
Frey, W.2, Autor           
Günther, G.1, Autor
Hoyle, C. R.1, Autor
Kivi, R.1, Autor
Luo, B. P.1, Autor
Molleker, S.1, Autor
Peter, T.1, Autor
Pitts, M. C.1, Autor
Schlager, H.1, Autor
Stiller, G.1, Autor
Vömel, H.1, Autor
Walker, K. A.1, Autor
Müller, R.1, Autor
Affiliations:
1external, ou_persistent22              
2Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              

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 Zusammenfassung: Nitric acid trihydrate (NAT) particles in the polar stratosphere have been shown to be responsible for vertical redistribution of reactive nitrogen (NOy). Recent observations by Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the CALIPSO satellite have been explained in terms of heterogeneous nucleation of NAT on foreign nuclei, revealing this to be an important formation pathway for the NAT particles. In state of the art global-or regional-scale models, heterogeneous NAT nucleation is currently simulated in a very coarse manner using a constant, saturation-independent nucleation rate. Here we present first simulations for the Arctic winter 2009/2010 applying a new saturation-dependent parametrisation of heterogeneous NAT nucleation rates within the Chemical Lagrangian Model of the Stratosphere (CLaMS). The simulation shows good agreement of chemical trace species with in situ and remote sensing observations. The simulated polar stratospheric cloud (PSC) optical properties agree much better with CALIOP observations than those simulated with a constant nucleation rate model. A comparison of the simulated particle size distributions with observations made using the Forward Scattering Spectrometer Probe (FSSP) aboard the high altitude research aircraft Geophysica, shows that the model reproduces the observed size distribution, except for the very largest particles above 15 mu m diameter. The vertical NOy redistribution caused by the sedimentation of the NAT particles, in particular the denitrification and nitrification signals observed by the ACE-FTS satellite instrument and the in situ SIOUX instrument aboard the Geophysica, are reproduced by the improved model, and a small improvement with respect to the constant nucleation rate model is found.

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 Datum: 2014
 Publikationsstatus: Erschienen
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 Identifikatoren: ISI: 000330853800033
DOI: 10.5194/acp-14-1055-2014
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Titel: Atmospheric Chemistry and Physics
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Katlenburg-Lindau, Germany : European Geosciences Union
Seiten: - Band / Heft: 14 (2) Artikelnummer: - Start- / Endseite: 1055 - 1073 Identifikator: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016