 |
| Titel |
Recent observations of carbon and sulfur gas emissions from Tavurvur, Bagana and Ulawun (Papua New Guinea) with a combination of ground- and air-borne direct and remote sensing techniques |
| VerfasserIn |
Santiago Arellano, Bo Galle, Kila Mulina, Julia Wallius, Brendan McCormick, Lois Salem, Roberto D'aleo, Ima Itikarai, Lukas Tirpitz, Nicole Bobrowski, Alessandro Aiuppa |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149309
|
| Publikation (Nr.) |
 EGU/EGU2017-13644.pdf |
|
|
|
|
|
| Zusammenfassung |
| Satellite observations reveal that volcanoes from Papua New Guinea
contributed with ca. 15{\%} of the global emission of volcanic sulfur
dioxide (SO$_{2})$ during the period 2005-2014. Relatively little is
known\sout{ }about their carbon dioxide (CO$_{2})$ outputs and more recent
levels and dynamics of degassing activity. During September 2016 we
conducted measurements of the CO$_{2}$/SO$_{2}$ ratio and the SO$_{2}$ flux
from Tavurvur, Bagana and Ulawun volcanoes using a combination of remote
sensing and direct sampling techniques. Tavurvur exhibits low-level passive
degassing from a modestly active vent and few other intra-crater fumaroles,
which made access possible for direct measurements of the CO$_{2}$/SO$_{2}$
ratio with a compact Multi-GAS instrument. A wide-field of view pointing
DOAS monitor was deployed for longer term monitoring of the SO$_{2}$ flux
from a distance of about 2 km. Bagana degasses continuously with occasional
emissions of ash, and its SO$_{2}$ flux, plume velocity and height was
constrained by simultaneous scanning and dual-beam DOAS measurements. Molar
ratios in the plume of Bagana were measured by the compact Multi-GAS aboard
a multi-rotor UAV, up to a height of 1.6 km above ground. Ulawun showed
continuous passive degassing and measurements with the UAV, up to an
altitude of ca. 1.8 km, and mobile-DOAS traverses from a car were used to
constrain its gas emission. Here we present an overview of the challenging
conditions, measurement strategies and results of this campaign that forms
part of the ongoing international effort DECADE aiming to better quantify
the global gas emission of carbon- and sulfur containing species from
volcanoes. |
|
|
|
|
|
|