Articles | Volume 15, issue 4
https://doi.org/10.5194/bg-15-1243-2018
https://doi.org/10.5194/bg-15-1243-2018
Research article
 | 
02 Mar 2018
Research article |  | 02 Mar 2018

Impacts of flocculation on the distribution and diagenesis of iron in boreal estuarine sediments

Tom Jilbert, Eero Asmala, Christian Schröder, Rosa Tiihonen, Jukka-Pekka Myllykangas, Joonas J. Virtasalo, Aarno Kotilainen, Pasi Peltola, Päivi Ekholm, and Susanna Hietanen

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Cited articles

APHA: Standard methods for the examination of water and wastewater, 20th Edn., American Public Health Association–American Water Works Association, Baltimore, USA, 1998.
Arndt, S., Jorgensen, B. B., LaRowe, D. E., Middelburg, J. J., Pancost, R. D., and Regnier, P.: Quantifying the degradation of organic matter in marine sediments: A review and synthesis, Earth-Sci. Rev., 123, 53–86, https://doi.org/10.1016/j.earscirev.2013.02.008, 2013.
Asmala, E., Autio, R., Kaartokallio, H., Pitkanen, L., Stedmon, C. A., and Thomas, D. N.: Bioavailability of riverine dissolved organic matter in three Baltic Sea estuaries and the effect of catchment land use, Biogeosciences, 10, 6969–6986, https://doi.org/10.5194/bg-10-6969-2013, 2013.
Asmala, E., Bowers, D. G., Autio, R., Kaartokallio, H., and Thomas, D. N.: Qualitative changes of riverine dissolved organic matter at low salinities due to flocculation, J. Geophys. Res.-Biogeosci., 119, 1919–1933, https://doi.org/10.1002/2014JG002722, 2014.
Asmala, E., Kaartokallio, H., Carstensen, J., and Thomas, D. N.: Variation in riverine inputs affect dissolved organic matter characteristics throughout the estuarine gradient, Front. Mar. Sci., 2, 125, https://doi.org/10.3389/fmars.2015.00125, 2016.
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Short summary
Iron is a common dissolved element in river water, recognizable by its orange-brown colour. Here we show that when rivers reach the ocean much of this iron settles to the sediments by a process known as flocculation. The iron is then used by microbes in coastal sediments, which are important hotspots in the global carbon cycle.
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