Impacts of environmental changes on groundwater carbon cycling are poorly understood despite their potentially high relevance to terrestrial carbon budgets. This study focuses on streambed groundwater chemistry during a period of drought-induced river drying and consequent disconnection between surface water and groundwater. Shallow groundwater underlying vegetated and bare portions of a braided streambed in the Platte River (Nebraska, USA) was monitored during drought conditions in summer 2012. Water temperature and dissolved inorganic carbon (dominated by HCO 3 À ) in streambed groundwater were correlated over a 3 month period coinciding with a decline in river discharge from 35 to 0 m 3 s À1 . Physical, chemical, and isotopic parameters were monitored to investigate mechanisms affecting the HCO 3 À trend. Equilibrium thermodynamic modeling suggests that an increase of pCO 2 near the water
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