Renard, J.-B., Tripathi, S. N., Michael, M., Rawal, A., Berthet, G., Fullekrug, M., Harrison, R. G., Robert, C., Tagger, M. and Gaubicher, B.
18 Nov 2013
In situ detection of electrified aerosols in the upper troposphere and stratosphere.
Atmospheric Chemistry and Physics, 13 (22).
To link to this article DOI: 10.5194/acp-13-11187-2013
Electrified aerosols have been observed in the
lower troposphere and in the mesosphere, but have never
been detected in the stratosphere and upper troposphere. We
present measurements of aerosols obtained during a balloon
flight to an altitude of 24 km. The measurements were per-
formed with an improved version of the Stratospheric and
Tropospheric Aerosol Counter (STAC) aerosol counter dedi-
cated to the search for charged aerosols. It is found that most of the aerosols are charged in the upper troposphere for altitudes below 10 km and in the stratosphere for altitudes above 20 km. Conversely, the aerosols seem to be uncharged between 10 km and 20 km. Model calculations are used to quantify the electrification of the aerosols with a stratospheric aerosol–ion model. The percentages of charged aerosols obtained with model calculations are in excellent agreement with the observations below 10 km and above 20 km. However, the model cannot reproduce the absence of electrification found in the lower stratosphere, as the processes leading to neutralisation in this altitude range are unknown. The presence of sporadic transient layers of electrified aerosol in the upper troposphere and in the stratosphere could have significant implications for sprite formation
|Date Deposited:||24 Feb 2014 12:21|
|Last Modified:||08 Jun 2015 02:46|
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