Tomographic reconstruction of gas plumes using scanning DOAS
Artikel i vetenskaplig tidskrift, 2009

This paper presents a method to reconstruct the gas distribution inside a vertical cross section of a gas plume by combining data from two or more scanning DOAS instruments using a tomographic algorithm. The method can be applied to gas plumes from any single, elevated point source, such as a volcano or industrial chimney. Such two-dimensional concentration distributions may prove to be useful for example in plume chemistry, dispersion and environmental impact studies. Here we show the case with one scanning DOAS instrument located on each side of the plume, which is the easiest and most economic setup as well as the most useful in routine monitoring of e.g. volcanic gas emissions. The paper investigates the conditions under which tomographic reconstructions can be performed and discusses limitations of this setup. The proposed method has been studied theoretically by numerical simulations and has been experimentally tested during two field campaigns, with measurements of SO2 emissions from a volcano and a power plant. The simulations show that, under good measurement conditions, the algorithm presented performs well, which is further confirmed by the experimental results.

Gas emission

Differential optical absorption spectroscopy

SO2

Tomography

Environmental impact

Författare

Mattias Erik Johansson

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Bo Galle

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Claudia Rivera

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Yan Zhang

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Bulletin of Volcanology

0258-8900 (ISSN) 1432-0819 (eISSN)

Vol. 71 1169-1178

Ämneskategorier

Annan naturresursteknik

Atom- och molekylfysik och optik

DOI

10.1007/s00445-009-0292-8