2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2018 | 9:00 AM - 9:15 AM | OF SMALL STREAMS AND GREAT LAKES: INTEGRATING TRIBUTARIES TO UNDERSTAND THE ECOLOGY AND BIOGEOCHEMISTRY OF LAKE SUPERIOR | 430 B

OF SMALL STREAMS AND GREAT LAKES: INTEGRATING TRIBUTARIES TO UNDERSTAND THE ECOLOGY AND BIOGEOCHEMISTRY OF LAKE SUPERIOR

Lake Superior receives inputs from approximately 2800 tributaries that provide limiting nutrients and dissolved organic matter (DOM) to the nearshore zone of this oligotrophic lake. Instream uptake of nitrogen, phosphorus, and dissolved organic carbon (DOC) can be rapid but varies seasonally in magnitude. Peak tributary export occurs during snowmelt-driven spring runoff, with additional pulses during rain-driven storm events. Tributary plumes with elevated DOC concentration, higher turbidity, and distinct DOM character can be detected in the near-shore during times of high runoff, but plumes can be quickly transported and diluted by in-lake currents and mixing. Understanding the variability in size and load of these tributary plumes, how they are transported within the lake, and how long they persist may be best addressed with environmental sensors and remote sensing using autonomous and unmanned vehicles. The biogeochemical connections between Lake Superior and its tributaries are vulnerable to climate change, and understanding and predicting future changes to these valuable freshwater resources will require a nuanced and detailed consideration of tributary inputs and interactions in time and space.

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Subsidy
Biogeochemistry

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Presenters/Authors

Amy Marcarelli (), Michigan Technological University, ammarcar@mtu.edu;