Light limitation of primary production in high latitude reservoirs
2005 (English)In: Hydrology and Earth System Sciences, ISSN 1027-5606, E-ISSN 1607-7938, Vol. 9, no 6, 707-720 p.Article in journal (Refereed) Published
To explore the effects of vertical mixing on the primary production in a northern reservoir, a Lagrangian particle dispersion model was coupled to a 1-D reservoir model where the vertical mixing was calculated using a k - ε model together with an empirically-based deep-water eddy viscosity. The primary production of each phytoplankton cell is assumed to be a function of the ambient light and not to be nutrient limited. The photoadaption follows first-order kinetics where the photoadaptive variables, α, β, and Pm, describe the coefficients of the photosynthesis-irradiance curve. The model is applied to the northern reservoir Akkajaure, which is strongly regulated with a mean and maximum depth of 30 m and 100 m respectively. Based on the release of 1000 particles (plankton), the model calculated the mean primary production of each plankton, during four different growing seasons. Vertical mixing has a substantial effect on the vertical distribution of phytoplankton and, thus, on the primary production in a reservoir. It was found that primary production was greater in a cold summer with weak stratification than in a warm summer when the reservoir was more stratified. © EGU.
Place, publisher, year, edition, pages
2005. Vol. 9, no 6, 707-720 p.
photosynthesis, particle dispersion, mixing model, physical control, reservoir
Social Sciences Interdisciplinary
IdentifiersURN: urn:nbn:se:liu:diva-30558DOI: 10.5194/hess-9-707-2005Local ID: 16146OAI: oai:DiVA.org:liu-30558DiVA: diva2:251381