The Dual-Beam mini-DOAS technique - measurements of volcanic gas emission, plume height and plume speed with a single instrument
Artikel i vetenskaplig tidskrift, 2009

The largest error in determining volcanic gas fluxes using ground based optical remote sensing instruments is typically the determination of the plume speed, and in the case of fixed scanning instruments also the plume height. We here present a newly developed technique capable of measuring plume height, plume speed and gas flux using one single instrument by simultaneously collecting scattered sunlight in two directions. The angle between the two measurement directions is fixed, removing the need for time consuming in-field calibrations. The plume height and gas flux is measured by traversing the plume and the plume speed by performing a stationary measurement underneath the plume. The instrument was tested in a field campaign in May 2005 at Mt. Etna, Italy, where the measured results are compared to wind fields derived from a meso-scale meteorological model (MM5). The test and comparison show that the instrument is functioning and capable of estimating wind speed at the plume height.

Författare

Mattias Erik Johansson

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Bo Galle

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Yan Zhang

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Claudia Rivera

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Deliang Chen

Göteborgs universitet

Klaus Wyser

Bulletin of Volcanology

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

Vol. 71 747-751

Ämneskategorier

Meteorologi och atmosfärforskning

Atom- och molekylfysik och optik