Volcanic CO2 detection with a DFM/OPA-based lidar.

The DFM/OPA-based lidar BILLI was used to investigate the volcanic plume released by the hydrothermal vent of Pisciarelli, in the Campi Flegrei volcano. BILLI remotely measured CO₂ concentrations in cross-sections of the near-vent plume using the differential absorption technique. To our knowledge, this is the first example of lidar-based measurement of volcanic CO₂. The spatial resolution was 1.5 m and the temporal resolution 20 s.