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| Titel |
Light limitation of primary production in high latitude reservoirs |
| VerfasserIn |
J. Sahlberg, L. Rahm |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 9, no. 6 ; Nr. 9, no. 6 (2005-12-31), S.707-720 |
| Datensatznummer |
250007150
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| Publikation (Nr.) |
 copernicus.org/hess-9-707-2005.pdf |
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| Zusammenfassung |
| 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,
a, b, 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. |
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