RATES OF VOLCANIC CO2 DEGASSING FROM AIRBORNE DETERMINATIONS OF SO2, EMISSION RATES AND PLUME CO2 SO2 - TEST STUDY AT PUU OO CONE, KILAUEA VOLCANO, HAWAII/

We present an airborne method that eliminates or minimizes several dis advantages of the customary plume cross-section sampling method for de termining volcanic CO2 emission rates. A LI-COR CO2 analyzer system (L ICOR), a Fourier transform infrared spectrometer system (FTIR), and a correlation spectrometer (COSPEC) were used to constrain the plume CO2 /SO2 and the SO2 emission rate. The method yielded a CO2 emission rate of 300 td(-1) (metric tons per day) for Pu'u 'O'o cone, Kilauea volca no, on 19 September 1995. The CO2/SO2 of 0.20 determined from airborne LICOR and FTIR plume measurements agreed with the CO2/SO2 of 204 grou nd-based samples collected from vents over a 14-year period since the Pu'u 'O'o eruption began in January 1983.