DECADE - Carbon Dioxide Flux at Poás Volcano, Costa Rica Project uri icon

DCO ID 11121/2577-1593-5618-4399-CC


  • Between 23 February and 6 March 2014 we successfully installed one permanent MultiGAS station at Poás volcano. The instrument was assembled and calibrated at the University of Palermo and INGV, Italy. After two days of testing in the labs of the National University of Costa Rica, the equipment was transported to sites at Poás. We chose specific locations for the installation after considering gas concentrations as measured by portable MultiGAS units, prevailing wind direction, telemetry possibilities, and longevity of the equipment. We installed instrument on the southwest rim of the active crater downwind of the fumarole field (up to 700ºC) located next to the acidic crater lake. The installation was highly successful and data are currently being transmitted via radio to servers at UNA and Chalmers University. The MultiGAS instrument records 30 minutes of gas concentration data every six hours (CO2, SO2, H2S, and H2O; one data point every nine seconds). The initial results indicate that about half of the time the plume direction and gas concentrations are high enough for adequate measurements of CO2 and SO2 concentrations and thus we expect daily data for gas ratios at both volcanoes. The current CO2/SO2 ratio at Poás is around 0.5.