2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2021 | 8:30 AM - 10:30 AM | Partitioning inorganic carbon fluxes from paired O2-CO2 gases in a headwater stream, Costa Rica | Virtual Platform

Partitioning inorganic carbon fluxes from paired O2-CO2 gases in a headwater stream, Costa Rica

The role of streams in the carbon cycle remains unconstrained, especially where FCO2 evasion is high. Tropical stream C cycling is understudied compared to temperate systems, and these systems could be the highest FCO2 due to high temperatures, organic matter inputs, and high respiration both in-stream and in surrounding soils. We present in-stream O2 and CO2 measurements from a headwater stream, Costa Rica to explore variability in ecosystem processes and combine with riparian well CO2 to estimate CO2 fluxes in the reach. O2 - CO2 data reveal CO2 supersaturation with groundwater CO2 inputs and larger production of in-stream CO2 than O2. FCO2 was less than hydrologic export of CO2 and HCO3- revealing an component of C cycling in streams that needs further estimates. Discharge was predictive of CO2 fluxes, showing positive correlation with ECO2, EHCO3, and GWCO2, and negatively correlated with NEP and FCO2. We note seasonality in fluxes, with wet season fluxes of ECO2, EHCO3, and GWCO2 greater than during the dry season, and greater gas variability in CO2 than O2. Our results highlight the importance discharge on lateral inputs and FCO2 in tropical headwater streams.?

Stream
Greenhouse gases
Tropical

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Presenters/Authors

Nick Marzolf (), North Carolina State University, nmarzol@ncsu.edu;