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| Titel |
Detection of reactive nitrogen containing particles in the tropopause region – evidence for a tropical nitric acid trihydrate (NAT) belt |
| VerfasserIn |
C. Voigt, H. Schlager, A. Roiger, A. Stenke, M. Reus, S. Borrmann, E. Jensen, C. Schiller, P. Konopka, N. Sitnikov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 24 ; Nr. 8, no. 24 (2008-12-15), S.7421-7430 |
| Datensatznummer |
250006508
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| Publikation (Nr.) |
 copernicus.org/acp-8-7421-2008.pdf |
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| Zusammenfassung |
| The detection of nitric acid trihydrate (NAT, HNO3×3H2O)
particles in the tropical transition layer (TTL) harmonizes our
understanding of polar stratospheric cloud formation. Large reactive
nitrogen (NOy) containing particles were observed on 8
August 2006 by instruments onboard the high altitude research
aircraft M55-Geophysica near and below the tropical tropopause. The
particles, most likely NAT, have diameters less than 6 μm and
concentrations below 10-4 cm−3. The NAT particle layer
was repeatedly detected at altitudes between 15.1 and 17.5 km over
extended areas of 9.5 to 17.2° N and 1.5° W to
2.7° E above the African continent. Satellite observations
suggest that the NAT particles could have nucleated on ice fed by
convective activity. Once nucleated, the NAT particles can slowly
grow within the TTL for days, while being transported over long
distances. Their in-situ detection combined with global model
simulations of the NAT supersaturation near the tropical tropopause
indicate the potential for a tropical tropopause NAT particle belt. |
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