Network for Observation of Volcanic and Atmospheric Change (NOVAC)-A global network for volcanic gas monitoring: Network layout and instrument description
Artikel i vetenskaplig tidskrift, 2010

This paper presents the global project Network for Observation of Volcanic and Atmospheric Change (NOVAC), the aim of which is automatic gas emission monitoring at active volcanoes worldwide. Data from the network will be used primarily for volcanic risk assessment but also for geophysical research, studies of atmospheric change, and ground validation of satellite instruments. A novel type of instrument, the scanning miniaturized differential optical absorption spectroscopy (Mini-DOAS) instrument, is applied in the network to measure volcanic gas emissions by UV absorption spectroscopy. The instrument is set up 5-10 km downwind of the volcano under study, and typically two to four instruments are deployed at each volcano in order to cover different wind directions and to facilitate measurements of plume height and plume direction. Two different versions of the instrument have been developed. Version I was designed to be a robust and simple instrument for measurement of volcanic SO2 emissions at high time resolution with minimal power consumption. Version II was designed to allow the best possible spectroscopy and enhanced flexibility in regard to measurement geometry at the cost of larger complexity, power consumption, and price. In this paper the project is described, as well as the developed software, the hardware of the two instrument versions, measurement strategies, data communication, and archiving routines. As of April 2009 a total of 46 instruments have been installed at 18 volcanoes worldwide. As a typical example, the installation at Tungurahua volcano in Ecuador is described, together with some results from the first 21 months of operation at this volcano.

DIFFERENTIAL OPTICAL-ABSORPTION

DOAS MEASUREMENTS

SO2 EMISSIONS

TUNGURAHUA

MAX-DOAS

STRATOSPHERE

SPECTROSCOPY

VOLCANO

SPECTROMETER

SOUFRIERE HILLS VOLCANO

PLUME

Författare

Bo Galle

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Mattias Erik Johansson

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

M. Kihlman

C. Kern

Universitat Heidelberg

T. Lehmann

Universitat Heidelberg

U. Platt

Universitat Heidelberg

Santiago Arellano

Chalmers, Institutionen för radio- och rymdvetenskap, Optisk fjärranalys

Silvana Hidalgo

Escuela Politécnica Nacional

Journal of Geophysical Research

0148-0227 (ISSN)

Vol. 115 Art. no. D05304- D05304

Ämneskategorier

Meteorologi och atmosfärforskning

Atom- och molekylfysik och optik

DOI

10.1029/2009JD011823