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

Bo Galle (Institutionen för radio- och rymdvetenskap, Optisk fjärranalys) ; Mattias E.B. Johansson (Institutionen för radio- och rymdvetenskap, Optisk fjärranalys) ; Claudia Rivera (Institutionen för radio- och rymdvetenskap, Optisk fjärranalys) ; Yan Zhang (Institutionen för radio- och rymdvetenskap, Optisk fjärranalys) ; M. Kihlman ; C. Kern ; T. Lehmann ; U. Platt ; Santiago Arellano (Institutionen för radio- och rymdvetenskap, Optisk fjärranalys) ; S. Hidalgo
Journal of Geophysical Research - Atmospheres (0148-0227). Vol. 115 (2010), p. Art. no. D05304.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: DIFFERENTIAL OPTICAL-ABSORPTION, SOUFRIERE HILLS VOLCANO, TUNGURAHUA, VOLCANO, DOAS MEASUREMENTS, SO2 EMISSIONS, MAX-DOAS, PLUME, SPECTROSCOPY, SPECTROMETER, STRATOSPHERE



Denna post skapades 2010-03-29. Senast ändrad 2016-08-16.
CPL Pubid: 118752

 

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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Optisk fjärranalys (2005-2010)

Ämnesområden

Optisk fysik
Meteorologi och atmosfärforskning

Chalmers infrastruktur

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NOVAC - Network for Observation of Volcanic and Atmospheric Change


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-