Recent weathering of silicon in Northern Sweden

Updated 2003-04-24

Lakes and dams play crucial roles in the global cycles for nutrients and organic carbon as links from the terrestrial sources to the marine sinks. The degree of retention is sometimes high in these water bodies. Treguér et al. (1995) report that increasing inputs of dissolved inorganic nitrogen and phosphorus into rivers and lakes support enhanced production of diatoms, resulting in decreasing concentrations of dissolved silicate (DSi) in the river loads. The construction of storage lakes in rivers enhances this effect, even in less eutrophicated rivers. This phenomenon is reported for large-scale systems like the Danube and the Black Sea (Humborg et al., 1997), the Mississippi river (Turner and Rabalais, 1994) as well as for more modest rivers like those entering the Baltic Sea (Humborg et al. 2000). A key factor in the retention process of the river system seems to be the residence time. The question is now which physical mechanisms governs the retention process in reservoir vs. dams. A comparative study between Akkajaure and Torne Träsk is under way to resolve the consequences of river regulation.This project is a part of a larger "programme" to investigate the reason for decreasing DSi levels in the Baltic with implications on the World Ocean.

Time frame

Status
Ongoing
Project time span
2000 - 2003
Data collection
not specified
Data processing
not specified
Data reporting
not specified

Contact information

Contact person
Lars Rahm
Address
Dept. of Water and Environmental Studies Linköping University SE-581 83 Linköping Sweden

Parameters and Media

Not specified

Geography

Regions studied
Abisko Scientific Research Station

Data availability

Samples/specimens archived in specimen banks?
No

Methods & Procedures

Not specified

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
No
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