A new automated method for high-throughput carbon and hydrogen isotope analysis of gaseous and dissolved methane at atmospheric concentrations

Atmospheric methane (CH) is the second most abundant and potent greenhouse gas after carbon dioxide (CO). Methane concentrations in the atmosphere have more than doubled (to 1858 ppb in 2018) since pre-industrial times,2-5 with a current growth rate in the atmosphere of 10 ppm/year. Therefore, understanding CH4