2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/26/2021 | 8:30 AM - 10:30 AM | UNDERSTANDING HOW REACH TRANSPORT TIMES INFLUENCE CONFIDENCE IN STREAM ECOSYSTEM METABOLIC RATES INFERRED FROM DO AND DIC SIGNALS | Virtual Platform

UNDERSTANDING HOW REACH TRANSPORT TIMES INFLUENCE CONFIDENCE IN STREAM ECOSYSTEM METABOLIC RATES INFERRED FROM DO AND DIC SIGNALS

The travel time of a stream reach interacts with the air-water gas exchange rate to influence confidence in estimates of metabolism from dissolved oxygen (DO) dynamics over that reach. However, shielding of dissolved inorganic carbon (DIC) from the influence of air-water exchange due to chemical partitioning to non-gaseous solutes suggests that the influence of reach travel time on uncertainty may differ for estimates of metabolism from DIC. We performed numerical experiments on simulated reaches that varied only with reach travel time, and we used the distributions of Monte Carlo ensembles of metabolism parameter estimates from DO and DIC to assess the relative changes in inferential confidence with variation in travel time. The relative patterns in uncertainty in metabolism estimates from DO and DIC varied similarly with reach transport times. However, inferential confidence was higher at all travel times for estimates from DIC relative to DO, due to the higher sensitivity of the DIC-pCO2 model output to metabolism parameters. This work contributes to a better understanding of the ideal reach lengths that should be used for inference of stream ecosystem metabolic rates from multiple dissolved metabolites.

Models
Stream
Residence time

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Presenters/Authors

Robert Payn (), Montana State University, Montana Institute on Ecosystems, rpayn@montana.edu;