2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 9:45 AM - 10:00 AM | Annual patterns in aquatic metabolism and CO2 emissions from New Hampshire streams | 306A

Annual patterns in aquatic metabolism and CO2 emissions from New Hampshire streams

Recent evidence has highlighted the ubiquity of carbon dioxide (CO₂) supersaturation in streams, yet our understanding of how the source of CO₂ (aquatic production versus catchment sources) varies in time and across different aquatic systems remains limited. Here we report two years of daily stream gross primary production (GPP), ecosystem respiration (ER), and CO₂ emissions estimates across five New Hampshire streams that vary in size, nutrient loading, and landscape context. All streams were net heterotrophic, with predictable seasonal peaks in GPP and ER. The estimated contribution of aquatic net ecosystem production (NEP) to stream CO₂ emissions varied from approximately 0 – 75%, although these estimates were sensitive to small changes in NEP for some sites. The proportion of CO₂ emissions supported by aquatic NEP was lower at higher discharge, perhaps due to increased CO₂ transport from soils to streams during wetter periods, or to biomass removal by scouring flows. Catchment sources represent substantial contributions to CO₂ emissions from temperate streams, but the proportion of CO₂ emissions from in situ carbon transformation is variable throughout the growing season.

S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
C10 Biogeochemistry
C31 Organic Matter Processing

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Presenters/Authors

Lauren Koenig (), University of New Hampshire, lauren.koenig@unh.edu;