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

Dugan, Hilary A.; Woolway, R. Iestyn; Santoso, Arianto B.; Corman, Jessica R.; Jaimes, Aline; Nodine, Emily R.; Patil, Vijay P.; Zwart, Jacob A.; Brentrup, Jennifer A.; Hetherington, Amy L.; Oliver, Samantha K.; Read, Jordan S.; Winters, Kirsten M.; Hanson, Paul C.; Read, Emily K.; Winslow, Luke A.; Weathers, Kathleen C.. 2016 Consequences of gas flux model choice on the interpretation of metabolic balance across 15 lakes. Inland Waters, 6 (4). 581-592. https://doi.org/10.5268/IW-6.4.836

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Abstract/Summary

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 k range 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 k influenced 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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.5268/IW-6.4.836
UKCEH and CEH Sections/Science Areas:	Parr
ISSN:	2044-2041
Additional Keywords:	gas exchange, GLEON, lakes, lake models, metabolism, sensor network
NORA Subject Terms:	Ecology and Environment Atmospheric Sciences
Date made live:	22 Dec 2016 10:46 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/515643

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