Abstract
Development of cavity ring-down spectroscopy
(CRDS) has enabled real-time monitoring of carbon stable
isotope ratios of carbon dioxide and methane in air. Here we
demonstrate that CRDS can be adapted to assess aquatic
carbon cycling processes from microbial to ecosystem scales.
We first measured in situ isotopologue concentrations of
dissolved CO2 (12CO2 and 13CO2) and CH4
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