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| Titel |
Aerosol observations and growth rates downwind of the anvil of a deep tropical thunderstorm |
| VerfasserIn |
D. A. Waddicor, G. Vaughan, T. W. Choularton, K. N. Bower, H. Coe, M. Gallagher, P. I. Williams, M. Flynn, A. Volz-Thomas, H.-W. Pätz, P. Isaac, J. Hacker, F. Arnold, H. Schlager, J. A. Whiteway |
| 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 ; 12, no. 14 ; Nr. 12, no. 14 (2012-07-17), S.6157-6172 |
| Datensatznummer |
250011319
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| Publikation (Nr.) |
 copernicus.org/acp-12-6157-2012.pdf |
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| Zusammenfassung |
| We present a case study of Aitken and accumulation mode aerosol
observed downwind of the anvil of a deep tropical thunderstorm. The
measurements were made by condensation nuclei counters flown on the
Egrett high-altitude aircraft from Darwin during the ACTIVE
campaign, in monsoon conditions producing widespread convection over
land and ocean. Maximum measured concentrations of aerosol with diameter
greater than 10 nm were 25 000 cm−3 (STP). By calculating
back-trajectories from the observations, and projecting onto
infrared satellite images, the time since the air exited cloud was
estimated. In this way a time scale of about 3 hours was derived
for the Aitken aerosol concentration to reach its peak. We
examine the hypothesis that the growth in aerosol concentrations can
be explained by production of sulphuric acid from SO2 followed by
particle nucleation and coagulation. Estimates of the sulphuric acid
production rate show that the observations are only consistent with
this hypothesis if the particles coagulate to sizes >10 nm much
more quickly than is suggested by current theory. Alternatively,
other condensible gases (possibly organic) drive the growth of
aerosol particles in the TTL. |
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