23 September 2002 Atmospheric CO2 measurements over an active volcano site using an IR laser system
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Abstract
The southern area of Italy is characterized by the presence of many active volcanic areas. In Pozzuoli (Napoli, Italy), an urban area characterized by high volcanic risk, a gaseous emitting site is present. CO2 is one of the emitted gases and the measurement of its atmospheric concentration is an important task in many environmental and scientific applications. A mobile IR laser system, able to measure the CO2 concentration along rectilinear atmospheric paths up to 1 km length, has been used in that area. The system computes the average concentration by processing the received IR laser radiation propagated along an open-air rectilinear link connecting the transmitter/receiver laser unit and a passive retroreflector device. The laser system scans a spectral range centered on 1580 nm wavelength. An isolated CO2 absorption line characterizes such range. A one-day measurement campaign has been made and more than 15 different atmospheric propagation links were considered moving the transmitter/receiver unit and some retroreflectors. The links were located over a gaseous emitting area whose extension is less than 100x100 square meters. A meteorological station was present and also temperature and wind measurements have been collected. CO2 measurements and meteorological data are presented and discussed. Moreover, the spatial configuration of the measurement links is such that ad-hoc tomographic data processing procedures are profitably usable. The two-dimensional time-averaged spatial distribution of the CO2 at about 1.5 meters over the monitored area is reported as retrieved by the tomographic procedures. Potential and perspectives of tomographic processing are also evidenced.
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Claudio Belotti, Fabrizio Cuccoli, Luca Facheris, Orlando Vaselli, "Atmospheric CO2 measurements over an active volcano site using an IR laser system", Proc. SPIE 4817, Diode Lasers and Applications in Atmospheric Sensing, (23 September 2002); doi: 10.1117/12.451408; https://doi.org/10.1117/12.451408
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