Negligible effect of hypolimnetic oxygenation on the trophic state of Lake Jyväsjärvi, Finland

Hypolimnetic oxygenation by pumping oxygen-rich surface water to the hypolimnion (HLO) is a commonly used tool for the restoration of nutrient-loaded dimictic lakes. However, in recent years its effectiveness has been questioned. In this case study we evaluated monitoring data covering a period of 2...

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Bibliographic Details
Published in:	Limnologica Vol. 58; pp. 1 - 6
Main Authors:	Kuha, Jonna K., Palomäki, Arja H., Keskinen, J. Tapio, Karjalainen, Juha S.
Format:	Journal Article
Language:	English
Published:	Elsevier GmbH 01-05-2016
Subjects:	Automated monitoring Chlorophyll a Dissolved oxygen Nutrients Year-round oxygenation Nutrients Year-round oxygenation Dissolved oxygen Automated monitoring Chlorophyll a
Online Access:	Get full text
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Summary:	Hypolimnetic oxygenation by pumping oxygen-rich surface water to the hypolimnion (HLO) is a commonly used tool for the restoration of nutrient-loaded dimictic lakes. However, in recent years its effectiveness has been questioned. In this case study we evaluated monitoring data covering a period of 23-years to show that, although experimental cessation of HLO drastically changed the lake's temperature and dissolved oxygen regimes, it did not significantly affect its trophic status. Thus, we recommend that the limited financial resources available are better directed towards further lowering the lake's external phosphorus load than continuing HLO.
ISSN:	0075-9511 1873-5851
DOI:	10.1016/j.limno.2016.02.001