Depth-integrated, continuous estimates of metabolism in a clear-water lake

By J. Coloso, J. Cole, Paul C. Hanson, Michael M. Pace. 2008

97 citations recorded by the source corpus.

High-frequency dissolved oxygen (DO) measurements have been used for estimating gross primary production (GPP) and respiration (R) in lake ecosystems. Most researchers have determined GPP and R only in surface waters, a practice that may underestimate R in general and GPP in clear-water lakes in particular. We deployed oxygen sondes at multiple sites and depths in a clear-water lake. Rates of GPP or R were similar horizontally over the surface waters of the lake. Diel DO signals weakened with depth; however, removing noise from the data, by either wavelet transforms or moving averages, enhanced our ability to resolve diel metabolic signals. While GPP declined sharply with depth, R was unrelated to depth. The majority of GPP and R occurred in the upper mixed layer, but deeper water accounted for 14%–28% of GPP and 20%–43% of R, depending on the statistical filtering technique used. GPP and R were nearly in balance in the surface waters, but for the entire lake R exceeded GPP, and net ecosystem production w...

Subfields: Nature and Landscape Conservation, Oceanography, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/5850e4d36ec18ea1cffbae215b3fdb4ecca2855a

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Citations in the corpus

• Derivation of lake mixing and stratification indices from high-resolution lake buoy data (2011, background): “For example, depth of the mixed layer has been calculated as a threshold of turbulence (MacIntyre et al., 2009), a temperature gradient (Coloso et al., 2008), a density gradient (Lamont et al., 2004), or chemical gradient (Cole et al., 2000).”