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5/22/2018 | 2:30 PM - 2:45 PM | LONG-TERM LAKE RECORDS REVEAL DECOUPLING OF NITROGEN AND PHOSPHORUS CYCLES IN RESPONSE TO AN EXTREME RAINFALL EVENT | 321

LONG-TERM LAKE RECORDS REVEAL DECOUPLING OF NITROGEN AND PHOSPHORUS CYCLES IN RESPONSE TO AN EXTREME RAINFALL EVENT

The ecosystem impacts of precipitation events on lakes are related to both the magnitude of the event and the internal cycling processes within the lake when the event occurs. In this paper, we combine discharge records with long-term lake water quality datasets to investigate the impacts of extreme events on nitrogen and phosphorus cycling in Lake Mendota, a large lake in an urban and agricultural watershed. In June 2008, precipitation totals in the watershed were 400% above normal values, triggering the largest discharge event recorded during 40 years of monitoring. Following the extreme event, the lake-wide mass of nitrogen and phosphorus increased by 35% and 21%, respectively (based on records between 1995 – 2015). Nitrogen concentrations remained elevated longer than phosphorus, suggesting (1) that nitrogen inputs were sustained longer than phosphorus and/or (2) that in-lake biogeochemical processing was more efficient at removing phosphorus compared to nitrogen. Surficial N:P ratios remained elevated after the storm at least seven years. As climate change is expected to increase extreme event frequency, continued ecosystem monitoring is needed to understand how these biogeochemical responses may translate to water quality concerns.

Ecosystem
Climate Change
Nitrogen

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Presenters/Authors

Jessica Corman (), University of Nebraska - Lincoln, jesscorman@gmail.com;