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Title: Effect of benthic boundary layer transport on the productivity of Mono Lake, California Authored by: Bruce, L.C., Jellison, R., Imberger, J. and Melack, J. Abstract:
The significance of the transport of nutrient-rich hypolimnetic water via the benthic boundary layer (BBL) on the productivity in Mono Lake was studied using a coupled hydrodynamic and ecological model validated against field data. The coupled model enabled us to differentiate between the role of biotic components and hydrodynamic forcing on the internal recycling of nutrients necessary to sustain high rates of primary productivity. A 4-yr period of monomixis (1991-1994) was simulated in which recycled nutrients from zooplankton excretion and bacterial mineralization exceeded sediment fluxes as the dominant source for primary productivity. Model outputs suggested that BBL transport was responsible for a 53% (± 4%) increase in the flux of hypolimnetic ammonium to the photic zone during stratification with an increase in primary production of 6% (± 4%) and secondary production of 5% (± 2%). Although the estimated impact of BBL transport on the productivity of Mono Lake was not large, significant nutrient fluxes were simulated during periods when BBL transport was most active. Extended analysis indicated that BBL transport may be more important in shallower lakes with lower productivity.
Reference: Bruce, L.C., Jellison, R., Imberger, J. and Melack, J., 2008, Effect of benthic boundary layer transport on the productivity of Mono Lake, California, doi:10.1186/1746-1448-4-11 |
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