State of the Environment
State of Lake Inarijärvi
The large and oligotrophic Lake Inarijärvi is situated upstream and upwind from the pollution sources.Water level regulation has a significant effect on the ecological condition of the lake. Regulation-caused detrimental effects on the littoral biota have decreased in the 2000’s due to the use of a new regulation policy which is better for the aquatic environment. The clearest effects can be seen as lowering of the highest water levels and prospects of recreational use becoming more common. There are also positive changes in fish stock. Changes in the hydrological conditions of Lake Inarijärvi are related to global warming. Average temperatures of surface water and water column in the summer were increasing during the monitoring period in 1961-2009. Water quality The water quality of Lake Inarijärvi is mostly excellent. No clear signs of eutrophication have been observed. Sediment material
In the studies on water, sediment means the layered earth that has drifted and fallen out to the bottom of a water body.Sediments are usually formed on the bottoms of seas, lakes and rivers. By analysing sediment layers, information may be obtained on the loading on the waterways and its fluctuations in the long-term. For instance, sediment studies are used to identify changes in the state of waterways, as well as climate trends during different periods.
Images: Pekka Räinä, Lapin ELY