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Multiple approaches to estimating air-water gas exchange in small lakes
Cary Institute of Ecosystem Studies, Millbrook, NY.
Kent State University, Kent, OH.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
University of Virginia, Charlottesville, VA.
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2010 (English)In: Limnology and Oceanography: Methods, ISSN 1541-5856, E-ISSN 1541-5856, Vol. 8, 285-293 p.Article in journal (Refereed) Published
Abstract [en]

The rate of gas exchange between air and water is an essential quantity in a number of contexts, from mass balances to the calculation of whole-system metabolism. The exchange of a gas between water and the atmosphere is controlled by differential partial pressures of gases in air and in water (both straightforward to measure) and by the amount of turbulent energy exchange between the air-water interface, the measurement of which is neither simple nor direct. This physical exchange is often expressed as a piston velocity (k). We compared four methods for estimating k in a series of small (0.3 to 45 ha), low-wind (mean wind < 3 m s–1) lakes: 1) floating chambers using ambient CH4; 2) whole-lake SF6 additions; 3) three wind-based models from the literature; and 4) C mass balances constrained by whole-lake 13C additions. All of the methods, with the exception of one windbased model, converged on values for k600 of between 0.35 and 0.74 m d–1 with no biases among methods. The floating chambers, if designed properly, are a cost-effective way of obtaining site-specific values of k for low wind lakes over fairly short time frames (hours).

Place, publisher, year, edition, pages
American Society of Limnology and Oceanography , 2010. Vol. 8, 285-293 p.
National Category
Oceanography, Hydrology, Water Resources
URN: urn:nbn:se:liu:diva-57554DOI: 10.4319/lom.2010.8.285ISI: 000284105000003OAI: diva2:326499
Available from: 2010-06-23 Created: 2010-06-23 Last updated: 2010-12-03

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Bastviken, David
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Department of Water and Environmental StudiesFaculty of Arts and Sciences
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Limnology and Oceanography: Methods
Oceanography, Hydrology, Water Resources

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