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Light limitation of primary production in high latitude reservoirs
SMHI, Professional Services. SMHI, Research Department, Oceanography.
SMHI, Research Department, Oceanography.
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
Abstract [en]

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-epsilon 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, alpha, beta, and P(m), 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.

Place, publisher, year, edition, pages
2005. Vol. 9, no 6, 707-720 p.
Keyword [en]
photosynthesis, particle dispersion, mixing model, physical control, reservoir
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:smhi:diva-1287ISI: 000235775000014OAI: oai:DiVA.org:smhi-1287DiVA: diva2:818697
Available from: 2015-06-09 Created: 2015-05-26 Last updated: 2016-03-21Bibliographically approved

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