Methane (CH4) flux was measured at 18 locations across three sites near the Gulkana Glacier terminus, Alaska Range, in mid-July 2019. These measurements aimed to investigate the CH4 flux from proglacial land surfaces of temperate mountain glaciers. Flux was measured using a closed chamber technique. At five locations, values of CH4 flux ranged from 1.8 to 11.0 μg C m-2 h-1, whereas no CH4 flux was detected at the remaining 13 locations. Air and water temperatures, pH, and electric conductivity of puddle and river water were also measured at each location. Stable isotope analysis was conducted on CH4 and water from puddles and rivers at the observation sites.
A Mon, study studied this question.