Publication Date:
2017-04-04
Description:
Active long-path differential optical absorption spectroscopy (LP-DOAS) has been an effective tool
for measuring atmospheric trace gases for several decades. However, instruments were large, heavy and powerinefficient,
making their application to remote environments extremely challenging. Recent developments in
fibre-coupling telescope technology and the availability of ultraviolet light emitting diodes (UV-LEDS) have
now allowed us to design and construct a lightweight, portable, low-power LP-DOAS instrument for use at remote
locations and specifically for measuring degassing from active volcanic systems. The LP-DOAS was used
to measure sulfur dioxide (SO2) emissions from La Fossa crater, Vulcano, Italy, where column densities of up
to 1.2 1018 molec cm2 ( 500 ppmm) were detected along open paths of up to 400m in total length. The
instrument’s SO2 detection limit was determined to be 2 1016 molec cm2 ( 8 ppmm), thereby making quantitative
detection of even trace amounts of SO2 possible. The instrument is capable of measuring other volcanic
volatile species as well. Though the spectral evaluation of the recorded data showed that chlorine monoxide
(ClO) and carbon disulfide (CS2/ were both below the instrument’s detection limits during the experiment, the
upper limits for the X/ SO2 ratio (XDClO, CS2/ could be derived, and yielded 2 103 and 0.1, respectively.
The robust design and versatility of the instrument make it a promising tool for monitoring of volcanic degassing
and understanding processes in a range of volcanic systems.
Description:
Published
Description:
355-367
Description:
2V. Dinamiche di unrest e scenari pre-eruttivi
Description:
3V. Dinamiche e scenari eruttivi
Description:
4V. Vulcani e ambiente
Description:
5V. Sorveglianza vulcanica ed emergenze
Description:
6A. Monitoraggio ambientale, sicurezza e territorio
Description:
N/A or not JCR
Description:
open
Keywords:
LP-DOAS
;
volcanic gas measurements
;
Vulcano Island
;
sulfur dioxide
;
01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects
;
01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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