Constraining the sulfur dioxide degassing flux from Turrialba volcano, Costa Rica using unmanned aerial system measurements

Xi, Xin
Johnson, Matthew S.
Jeong, Seongeun
Fladeland, Matthew
Pieri, David
Diaz, Jorge Andres
Bland, Geoffrey L.

Open link

Publication date

October 2016

DOI

10.1016/j.jvolgeores.2016.06.023

Publisher

The Authors. Published by Elsevier B.V.

Abstract

AbstractObserved sulfur dioxide (SO2) mixing ratios onboard unmanned aerial systems (UAS) during March 11–13, 2013 are used to constrain the three-day averaged SO2 degassing flux from Turrialba volcano within a Bayesian inverse modeling framework. A mesoscale model coupled with Lagrangian stochastic particle backward trajectories is used to quantify the source-receptor relationships at very high spatial resolutions (i.e., <1km). The model shows better performance in reproducing the near-surface meteorological properties and observed SO2 variations when using a first-order closure non-local planetary boundary layer (PBL) scheme. The optimized SO2 degassing fluxes vary from 0.59±0.37 to 0.83±0.33ktd−1 depending on the PBL scheme used. These f...