2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | DIFFICULTIES IN ESTIMATING ECOSYSTEM RESPIRATION IN A TRULY LARGE RIVER | Virtual Platform
DIFFICULTIES IN ESTIMATING ECOSYSTEM RESPIRATION IN A TRULY LARGE RIVER
In contrast to the wealth of metabolism data in small streams, metabolism estimates from truly large rivers are almost non-existent. Truly large rivers have low transverse mixing, substantial planktonic contributions, and often have discontinuities, such as large dams. As a result, we expect that such rivers will have metabolism patterns distinct from small streams. They also present new challenges to completing metabolism estimates. We continuously deployed dissolved oxygen (DO) and temperature sensors for 2.5y in the Hanford Reach of the Columbia River, in Washington, USA and estimated gross primary production (GPP) and ecosystem respiration (ER) with Bayesian inverse modeling using streamMetabolizer. GPP ranged from 4.69 to 19.80 g O2 m-2 d-1 with peak production coinciding with maximum temperature, in late summer. ER estimates were unreliable, however, because DO remained above saturation for weeks at a time. After correcting downstream DO for the effects of an upstream dam (85km), we found that GPP would need to be 12 times higher than ER, an improbable ratio, to explain the observed oversaturation. We conclude that accurate estimates of ER in truly large rivers will require novel approaches.
- Ecosystem
- Energy flows
- Biogeochemistry
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Presenters/Authors
Sarah S. Roley
(), Washington State University, sarah.roley@wsu.edu;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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William Perkins
(), Pacific Northwest National Laboratory, William.Perkins@pnnl.gov;
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Vanessa A. Garayburu-Caruso
(), Pacific Northwest National Laboratory, vanessa.garayburu-caruso@pnnl.gov;
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