Sediment Records Shed Light on Drivers of Decadal Iron Concentration Increase in a Boreal Lake

Björnerås, Caroline; Weyhenmeyer, Gesa A.; Hammarlund, Dan; Persson, Per; Kritzberg, Emma S.

doi:10.1029/2021jg006670

Title: Sediment Records Shed Light on Drivers of Decadal Iron Concentration Increase in a Boreal Lake

Journal Article · Tue Mar 01 00:00:00 EST 2022 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2021jg006670· OSTI ID:1982081

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Lund Univ. (Sweden)
Uppsala Univ. (Sweden)

Increasing iron (Fe) concentrations are found in lakes on a wide geographical scale but exact causes are still debated. The observed trends might result from increased Fe loading from the terrestrial catchment, but also from changes in how Fe distributes between the water column and the sediments. To get a better understanding of the causes we investigated whether there has been any change in the sediment formation of Fe sulfides (FeS) as an Fe sink in response to declining atmospheric sulfur (S) deposition during recent decades. For our study, we chose Lake Bolmen in southern Sweden, a lake for which we confirmed that Fe concentrations in the water column have strongly increased along with water color during 1966–2018. Our investigations showed that Fe accumulation and speciation varied independently of S accumulation patterns in the Lake Bolmen sediment record. Thus, we were not able to relate the positive trend in Fe concentrations to reduced FeS binding in the sediments. Furthermore, we found that Fe accumulation rates increased along with lake water Fe concentrations, indicating that increased catchment loading rather than a change in the distribution between the sediments and the water column has driven the increase in Fe concentrations. The increased loading may be due to land-use change in the form of an extensive expansion of coniferous forest during the past century. Altered forest management practices and increased precipitation may have led to enhanced weathering and erosion of organic soil layers under aging coniferous forest.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)

Grant/Contract Number:: AC02-76SF00515; P41GM103393

OSTI ID:: 1982081

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 127, Issue 3; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Sediment Records Shed Light on Drivers of Decadal Iron Concentration Increase in a Boreal Lake

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