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| Titel |
The observation of nitric acid-containing particles in the tropical lower stratosphere |
| VerfasserIn |
P. J. Popp, T. P. Marcy, E. J. Jensen, B. Kärcher, D. W. Fahey, R. S. Gao, T. L. Thompson, K. H. Rosenlof, E. C. Richard, R. L. Herman, E. M. Weinstock, J. B. Smith, R. D. May, H. Vömel, J. C. Wilson, A. J. Heymsfield, M. J. Mahoney, A. M. Thompson |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2006-02-27), S.601-611 |
| Datensatznummer |
250003513
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| Publikation (Nr.) |
 copernicus.org/acp-6-601-2006.pdf |
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| Zusammenfassung |
| Airborne in situ measurements over the eastern Pacific Ocean in January 2004
have revealed a new category of nitric acid (HNO3)-containing particles
in the tropical lower stratosphere. These particles are most likely composed
of nitric acid trihydrate (NAT). They were intermittently observed in a
narrow layer above the tropopause (18±0.1 km) and over a broad
geographic extent (>1100 km). In contrast to the background liquid sulfate
aerosol, these particles are solid, much larger (1.7-4.7 µm vs. 0.1µm
in diameter), and significantly less abundant (<10-4 cm-3 vs. 10 cm-3). Microphysical trajectory models suggest that
the NAT particles grow over a 6-14 day period in supersaturated air that
remains close to the tropical tropopause and might be a common feature in
the tropics. The small number density of these particles implies a highly
selective or slow nucleation process. Understanding the formation of solid
NAT particles in the tropics could improve our understanding of
stratospheric nucleation processes and, therefore, dehydration and
denitrification. |
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