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Studies of Volcanic Plumes with Remote Spectroscopic Sensing Techniques -DOAS and FTIR measurements on volcanoes of the Network for Observation of Volcanic and Atmospheric Change-

Santiago Arellano (Institutionen för rymd- och geovetenskap, Optisk fjärranalys)
Göteborg : Chalmers University of Technology, 2014. ISBN: 978-91-7597-070-7.- 85 s.
[Doktorsavhandling]

Volcanism is a rich geodynamical process, closely linked to the origin and ongoing evolution of the lithosphere, atmosphere, hydrosphere and biosphere. Humans have benefited from the resources provided by volcanoes but also been threatened by the dangers of volcanic eruptions, which accurate prediction remains elusive. This is partly due to the inherent complexity of volcanic systems and partly because of the difficulty of conducting key observations to characterize them. In particular, since the segregation and escape of magmatic volatiles are essential mechanisms behind volcanic eruptions, monitoring the intensity and composition of the resulting emissions in the atmosphere is essential to characterize the state of volcanic activity; however, their direct measurement is not always feasible. Remote spectroscopic sensing, whereby gas species can be quantified by their spectral signatures in electromagnetic radiation gathered at a prudent distance from the plume, offers the possibility to conduct reliable and sustainable monitoring of volcanic emissions. To expand the remote sensing capabilities of volcanological observatories the Network for Observation of Volcanic and Atmospheric Change (NOVAC) was established in 2005. The central theme of this thesis is the acquisition, analysis and interpretation of measurements of volcanic gas emissions on volcanoes of NOVAC. Measurements of the mass flow rate of SO2 and the molar ratios of SO2 against BrO and HCl were obtained by scanning-Differential Optical Absorption Spectroscopy (DOAS) of scattered solar ultraviolet radiation and by Fourier-Transform Spectroscopy (FTIR) of direct solar infrared radiation. The uncertainty of the measurements is characterized and methods for combining observations from different sensors implemented. Statistical and physical models of degassing are proposed for selected volcanoes of the network. The resulting time-series of emission on 16 volcanoes is one of the more detailed compilations of volcanic degassing in the last decade, particularly from passive emissions which are difficult to detect from satellite platforms. This work aims at advancing our knowledge of volcanic eruptions for a better mitigation of their risks.

Nyckelord: Volcanic gas emissions, Remote Sensing, DOAS, FTIR, NOVAC


Doktorsavhandlingar vid Chalmers tekniska högskola Ny series nr 3751 Also including these manuscripts: "Analysis of uncertainty of the time-averaged estimation of volcanic gas emission rate from scanning-DOAS measurements of tropospheric plumes” Manuscript S. Arellano, B. Galle, M. Johansson, C. Kern, M. Van Roozendael, U. Platt “Inventory of SO2 gas emission rate measurements from the global Network for Observation of Volcanic and Atmospheric Change (NOVAC)” Manuscript S. Arellano, B. Galle, M. Johansson, P. Norman, the NOVAC collaboration



Denna post skapades 2014-09-05. Senast ändrad 2014-09-16.
CPL Pubid: 202362

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Optisk fjärranalys (2010-2017)

Ämnesområden

Molekylfysik
Spektroskopi
Miljövetenskap
Multidisciplinär geovetenskap
Geofysik
Geokemi
Fjärranalysteknik

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


Network for Observation of Volcanic and Atmospheric Change (NOVAC)-A global network for volcanic gas monitoring: Network layout and instrument description


Degassing patterns of Tungurahua volcano (Ecuador) during the 1999–2006 eruptive period, inferred from remote spectroscopic measurements of SO2 emissions


Examination

Datum: 2014-10-03
Tid: 10:00
Lokal: ED-salen, Hörsalsvägen 11, Chalmers tekniska högskola, Göteborg
Opponent: Dr. rer. nat. Konradin Weber, University of Applied Sciences i Düsseldorf, Tyskland

Ingår i serie

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie 3751