Publication Date:
2019-12-02
Description:
Volcanic gases and aerosols emissions from passive degassing or low eruptive events are now
included in most climate models despite large uncertainties still exist about their injection height and their
temporal and spatial variability. The aim of this study is to quantify the evolution of the gas and aerosols
inside volcanic plumes with high kilometric-resolution simulations. With online chemistry and aerosols,
these simulations are carried out together with in situ measurements of aerosol and gas-phase properties to
assess the impact of Etna and Stromboli volcanic plumes produced by passive degassing and regular
Strombolian activity, respectively. Comparison between simulation and observations show that the
simulation reproduces the main characteristics of the volcanic plume evolution and confirms that volcanic
plumes produced by passive degassing or low eruptive events have a strong impact on cloud condensation
nuclei (CCN) formation increasing the number of CCN by a factor of 5. It was also shown that depending
on the plume location, the aerosols will act as CCN at different distance from the vent. In the marine
atmospheric boundary layer, the aerosols will act as CCN at proximity to the vent (less than 50 km)
because of strong condensation sink inhibiting nucleation. In comparison, in the free troposphere, aerosols
will act as CCN far from the vent, at more than 200 km. To the best of our knowledge, this study using in
situ measurements as well as subkilometric simulations is unique
Description:
Published
Description:
11389-11405
Description:
4V. Processi pre-eruttivi
Description:
JCR Journal
Keywords:
volcanology
;
volcanic degassing
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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