Aerosol observations and growth rates downwind of the anvil of a deep tropical thunderstorm

D Waddicor, G Vaughan, T Choularton, K Bower, M Gallagher, P Williams, M Flynn, A Volz-Thomas, W Patz, P Isaac, Jorg Hacker, Frank Arnold, H Schlager, J Whiteway

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    Abstract

    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 cmg -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.

    Original languageEnglish
    Pages (from-to)6157-6172
    Number of pages16
    JournalAtmospheric Chemistry and Physics Discussions
    Volume12
    Issue number14
    DOIs
    Publication statusPublished - 2012

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    Waddicor, D., Vaughan, G., Choularton, T., Bower, K., Gallagher, M., Williams, P., Flynn, M., Volz-Thomas, A., Patz, W., Isaac, P., Hacker, J., Arnold, F., Schlager, H., & Whiteway, J. (2012). Aerosol observations and growth rates downwind of the anvil of a deep tropical thunderstorm. Atmospheric Chemistry and Physics Discussions, 12(14), 6157-6172. https://doi.org/10.5194/acp-12-6157-2012