Carbon output of meltwater from glaciers is a significant component of the global carbon balance (Wadham et al., 2019). Estimating the CO2 flux from subglacial environments is important for determining how glaciers and ice sheets contribute to atmospheric CO2 (Graly et al., 2017). Accurate measurements of dissolved CO2 (dCO2) from glacial meltwaters underpin this effort. Current research lacks consistent high frequency data required to estimate total CO2 flux, determine its relationship to melt rates and seasonal discharge, and to constrain the source of dCO2. During the early melt season of June 2018, dCO2 was measured using the Eosense eosGP probe in a subglacial river which drains the Greenland Ice Sheet (GrIS). The suitability of the eosGP for determining time-dependent variation of dCO2 in subglacial meltwater was tested during a five-day deployment. This campaign was part of a larger research project aiming to understand subglacial carbon cycling and its release to the atmosphere.

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