2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2018 | 11:15 AM - 11:30 AM | TEMPORAL AND SPATIAL VARIABILITY IN ORGANIC CARBON CONCENTRATION AND COMPOSITION IN LAKE MICHIGAN TRIBUTARIES | 430 B

TEMPORAL AND SPATIAL VARIABILITY IN ORGANIC CARBON CONCENTRATION AND COMPOSITION IN LAKE MICHIGAN TRIBUTARIES

The tributaries of the Great Lakes represent a major source of dissolved organic matter (DOM) loading. DOM contributes to numerous environmental processes including carbon transport, redox cycling, and interactions with environmental contaminants. However, little is known about the temporal and spatial variability in organic carbon composition and concentration in Great Lakes tributaries. We assessed seasonal DOM dynamics in >100 Lake Michigan tributaries over a period of one year, supplemented by monthly sampling of 30 tributaries during the frost-free period. Dissolved organic carbon (DOC) concentrations were used as a surrogate for DOM, while UV-visible spectroscopy was used to assess DOM composition. DOC concentrations are higher in northern tributaries, where wetlands make up a large portion of watershed area. Interestingly, low spatial variability in optical properties correlated with aromaticity and molecular weight indicate that the DOM being transported to Lake Michigan is primarily terrestrial in origin. However, seasonal fluctuations in the molecular weight of DOM suggest that the fraction of microbial contributions increase during winter and spring. Our extensive seasonal sampling reveals the dynamic role of tributary rivers in connecting watershed and lake carbon budgets.

Temporal
Biogeochemistry
Connectivity

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Presenters/Authors

Christina K. Remucal (), University of Wisconsin - Madison, remucal@wisc.edu;