Sedimentary geochemical record of humanᅵinduced environmental changes in the Lake Brunnsviken watershed, SwedenShow others and affiliations
2004 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Limnology and Oceanography, Vol. 49, no 5, p. 1560-1569Article in journal (Refereed) Published
Abstract [en]
Environmental changes in Lake Brunnsviken, its watershed, and the greater Stockholm region since the middle of the nineteenth century have left interpretable geochemical imprints in the bottom sediments. These human-induced perturbations within the lakeᅵs watershed included agriculture, urbanization, sewage and industrial disposal, and water column aeration. Smaller d15Ntotal values, high organic carbon mass accumulation rates, low C:N ratios, and larger d13Corg values identify periods of increased nutrient delivery and elevated primary productivity in the lake. C: S ratios that change from high to low trace the transition from an oxic hypolimnion to an anoxic one during the periods of high productivity. Accumulations of redox-sensitive trace elements increase during the anoxic period and are further magnified during a time of industrial waste discharge into the lake. A recent decrease in black carbon concentrations in sediments reflects the conversion from wood and coal to cleaner forms of energy.
Place, publisher, year, edition, pages
John Wiley & Sons, 2004. Vol. 49, no 5, p. 1560-1569
National Category
Environmental Sciences Geosciences, Multidisciplinary Geology Geochemistry
Identifiers
URN: urn:nbn:se:liu:diva-151917DOI: 10.4319/lo.2004.49.5.1560OAI: oai:DiVA.org:liu-151917DiVA, id: diva2:1254707
2018-10-102018-10-102021-12-29Bibliographically approved