Abstract
Dissolved CO2 dynamics in stormflow and event water versus preevent water contributions to storm hydrographs were assessed in a forested headwater catchment of the Brazilian Amazon using high‐frequency data. We applied the transfer function hydrograph separation model (TRANSEP) using specific conductance as a conservative tracer, finding preevent water to average 0.79 ± 0.03 of storm discharge (mean ± 1 SE for n = 14 storms). In situ, direct measurements of dissolved CO2 were able to capture new hydrobiogeochemical processes in real time, including CO2 pulses observed on the falling limb of storm hydrographs, the magnitudes of which were inversely related to preevent water fractions (r = −0.97, p < 0.0001).
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