Over 50 whole‐air gas samples were collected in Mt. St. Helens volcanic plumes beginning with the original steam and ash plumes in March 1980 and continuing through June 1980. Four research aircraft were used to collect the samples, which were analyzed by five different analytical techniques for 14 separate trace gases. COS, CS 2 , CH 3 Cl, CO 2 , CO, N 2 O, C 2 H 6 and C 2 H 2 were found in elevated amounts in the volcanic plume gases. Order‐of‐magnitude estimates of COS, CS 2 , CH 3 Cl, CO 2 and CO fluxes have been made for several types of eruptive phases. COS was a substantial fraction of the sulfur‐carrying gases during the May 18 eruptions, although SO 2 and H 2 S still predominated.
No takes yet. Share an insight, caveat, or question.
Cronn et al. (1982) studied this question.