The importance of transport processes and spatial gradients on in situ estimates of lake metabolism

We measured spatial gradients of dissolved oxygen in a eutrophic reservoir from repeated transects over a 5-day period. The equation typically used to compute lake metabolism was extended to the full advection–diffusion–reaction equation, which includes transport terms. These transport terms were co...

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Bibliographic Details
Published in:Hydrobiologia 2013, Vol.700 (1), p.9-21
Main Authors: Antenucci, Jason P., Tan, Kok Meng, Eikaas, Hans S., Imberger, J.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Biomedical and Life Sciences
Dissolved oxygen
Ecology
Eutrophication
Fresh water ecosystems
Freshwater
Freshwater & Marine Ecology
Fundamental and applied biological sciences. Psychology
General aspects
Lakes
Life Sciences
Oxygen
Primary Research Paper
Reservoirs
Sediment transport
Synecology
Transport processes
Zoology
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Summary:We measured spatial gradients of dissolved oxygen in a eutrophic reservoir from repeated transects over a 5-day period. The equation typically used to compute lake metabolism was extended to the full advection–diffusion–reaction equation, which includes transport terms. These transport terms were computed and found to be of similar magnitude to the rate of change of dissolved oxygen. We demonstrate that neglecting transport terms in this reservoir could lead to over-estimates in net ecosystem production calculations in the surface layer of up to 100%. We advocate the calculation of nondimensional Peclet and Damkohler numbers in future studies to assist in determining the importance of transport terms on lake metabolism estimates.
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-012-1212-z