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6/06/2017 | 12:00 PM - 12:15 PM | Organic carbon quality and quantity during storm events across the Connecticut River watershed | 302B

Organic carbon quality and quantity during storm events across the Connecticut River watershed

Despite recognition that most organic matter enters river networks during storms, studies of stormflow dissolved organic matter (DOM) quality are lacking. To address this knowledge gap, we assessed DOM quality and flux across ten storm events in the Connecticut River watershed, at stream sites in Vermont (n=8) and Connecticut (n=8) ranging in size from first to sixth order. Organic carbon fluxes were determined with in situ sensors and water samples were analyzed for DOM quality using spectroscopy – including PARAFAC analysis. The proportion of terrestrial DOM increased at all sites during storm events, but the quantity and type of terrestrial DOM depended on season and watershed topography. Anthropogenic land use in Connecticut and higher wetland coverage in Vermont drove differences in stormflow DOM quality across regions. The proportion of terrestrial DOM during storms decreased with increasing catchment area, indicating processing of this material within the river network. Most studies of DOM reactivity are conducted under baseflow conditions, but changes to DOM quality during storms means that processing of baseflow DOM is not a good predictor of rates during high flows.

C10 Biogeochemistry
C31 Organic Matter Processing
S29 Macrosystem Ecology of Aquatic Systems

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Presenters/Authors

Jacob Hosen (), Purdue University, jhosen@purdue.edu;