Publication Date:
2017-04-04
Description:
The volcanic plumes from degassing Etna (Italy) were extensively probed with instruments
onboard the Deutsches Zentrum für Luft- und Raumfahrt research aircraft Falcon during the contrail,
volcano, and cirrus experiment CONCERT on 29/30 September 2011. Up to 10.4 ppmv SO2 and 0.3 ppmv
HCl were detected with the atmospheric chemical ionization mass spectrometer AIMS at 3.1 km altitude
and 20 km distance to the summit. HNO3 is the dominant reactive nitrogen component in the plumes.
Linking aircraft and ground-based observations by Hybrid Single-Particle Lagrangian Integrated Trajectory
dispersion modeling, we identify two crater plumes with different compositions primarily injected by the
Bocca Nuova and North East craters. Uniquely, we follow their chemical evolution up to 5 h plume age. Our
results show that CO2/SO2 and SO2/HCl molar ratios are stable in the ageing plumes. Hence, conversion
of SO2 to H2SO4 and partitioning of HCl in acidic plume particles play a minor role at dry tropospheric
conditions. Thus, these trace gases allow monitoring volcanic activity far from the crater.
Description:
Published
Description:
2196–2203
Description:
4V. Vulcani e ambiente
Description:
JCR Journal
Description:
restricted
Keywords:
aircraft measurements
;
CO2/SO2 and SO2/HCl molar ratios are stable during atmospheric plume evolution
;
These trace gas ratios allow monitoring volcanic activity far from the crater
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
