Consequences of gas flux model choice on the interpretation of metabolic balance across 15 lakes

Inland Waters
By: , and 

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Abstract

Ecosystem metabolism and the contribution of carbon dioxide from lakes to the atmosphere can be estimated from free-water gas measurements through the use of mass balance models, which rely on a gas transfer coefficient (k) to model gas exchange with the atmosphere. Theoretical and empirically based models of krange in complexity from wind-driven power functions to complex surface renewal models; however, model choice is rarely considered in most studies of lake metabolism. This study used high-frequency data from 15 lakes provided by the Global Lake Ecological Observatory Network (GLEON) to study how model choice of kinfluenced estimates of lake metabolism and gas exchange with the atmosphere. We tested 6 models of k on lakes chosen to span broad gradients in surface area and trophic states; a metabolism model was then fit to all 6 outputs of k data. We found that hourly values for k were substantially different between models and, at an annual scale, resulted in significantly different estimates of lake metabolism and gas exchange with the atmosphere.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Consequences of gas flux model choice on the interpretation of metabolic balance across 15 lakes
Series title Inland Waters
DOI 10.1080/IW-6.4.836
Volume 6
Issue 4
Year Published 2016
Language English
Publisher International Society of Limnology
Contributing office(s) Office of Water Information
Description 12 p.
First page 581
Last page 592