Remote detection of HCl and SO2in volcanic gas from Unzen Volcano, Japan

1993 ◽  
Vol 20 (13) ◽  
pp. 1355-1358 ◽  
Author(s):  
Toshiya Mori ◽  
Kenji Notsu ◽  
Yasunori Tohjima ◽  
Hiroshi Wakita
Keyword(s):  
Remote Detection ◽  
Volcanic Gas ◽  
Unzen Volcano

Equilibrium temperature and redox state of volcanic gas at Unzen volcano, Japan

1994 ◽  
Vol 60 (3-4) ◽  
pp. 263-272 ◽  
Author(s):  
Takeshi Ohba ◽  
Jun-ichi Hirabayashi ◽  
Minoru Yoshida
Keyword(s):  
Redox State ◽  
Equilibrium Temperature ◽  
Volcanic Gas ◽  
Unzen Volcano

Applying Biological Enzyme to Remove Plugging in Screen Pipe Completed Horizontal Wells in Volcanic Gas Reservoir

2013 ◽  
Author(s):  
Yingan Zhang ◽  
Hongwei Wang ◽  
Guangyu Liu ◽  
Zhaopeng Zhu ◽  
Yongwei Duan ◽  
...  
Keyword(s):  
Horizontal Wells ◽  
Volcanic Gas ◽  
Gas Reservoir

Mathematical modelling of remote detection of molecular air pollutants

1987 ◽  
Vol 52 (6) ◽  
pp. 1397-1406
Author(s):  
František Zrcek ◽  
Milan Horák
Keyword(s):  
Atmospheric Aerosols ◽  
Air Pollutants ◽  
Complex Refractive Index ◽  
Mie Scattering ◽  
Heat Emission ◽  
Remote Detection ◽  
Radiation Absorption ◽  
Variable Concentration ◽  
Lidar Equation ◽  
Optical Pathway

A model of remote detection of molecular air pollutants is devised based on the lidar equation. The various kinds of interaction of radiation with matter, viz. absorption, induced fluorescence, and Raman scattering, are taken into account; detection of either scattered or reflected signal is considered. The reflection is assumed to be either axial, using a retroreflector, or omnidirectional from a field target. Based on this model, an algorithm was set up for simulation of the different variants of the experiment, making allowance for a generally variable concentration of the compound along the optical pathway of the light beam. The basic atmospheric processes, viz. radiation absorption by the backround, heat emission, turbulence, and the effect of atmospheric aerosols, are treated, and the last of them is found to play the major role. Aerosols are looked upon as a source of the Mie scattering and they are described by distribution equations with respect to the particle size and the complex refractive index. The variable concentration of the aerosol along the optical pathway and the simultaneous effect of a higher numberof aerosol types are included.

scholarly journals On the use of plume models to estimate the flux in volcanic gas plumes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Julia Woitischek ◽  
Nicola Mingotti ◽  
Marie Edmonds ◽  
Andrew W. Woods
Keyword(s):  
Electrochemical Sensors ◽  
Measurement Techniques ◽  
Flux Measurement ◽  
Hydrothermal Systems ◽  
Mount Etna ◽  
Volcanic Gas ◽  
Gas Flux ◽  
Convective Structures ◽  
Video Images ◽  
Villarrica Volcano

AbstractMany of the standard volcanic gas flux measurement approaches involve absorption spectroscopy in combination with wind speed measurements. Here, we present a new method using video images of volcanic plumes to measure the speed of convective structures combined with classical plume theory to estimate volcanic fluxes. We apply the method to a nearly vertical gas plume at Villarrica Volcano, Chile, and a wind-blown gas plume at Mount Etna, Italy. Our estimates of the gas fluxes are consistent in magnitude with previous reported fluxes obtained by spectroscopy and electrochemical sensors for these volcanoes. Compared to conventional gas flux measurement techniques focusing on SO2, our new model also has the potential to be used for sulfur-poor plumes in hydrothermal systems because it estimates the H2O flux.

Sign in / Sign up

Export Citation Format

Share Document