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Sediment DSi and DIP fluxes under changing oxygen availability in bottom waters
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences.
2018 (English)In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 23, p. 159-174Article in journal (Refereed) Published
Abstract [en]

In the present study, we investigated how sediment fluxes of dissolved silica (DSi) and dissolved inorganic phosphorus (DIP) were affected by dissolved oxygen (DO) availability in bottom waters. Sediments from two sites in the Baltic proper were incubated under changing oxygen conditions. Our results show that when DO availability decreased from oxic to hypoxic level, the average DSi fluxes decreased significantly at the two sites from 2.12 +/- 0.04 to 0.87 +/- 0.18 and from 2.37 +/- 0.09 to 1.91 +/- 0.55 mmol Si m(-2) d(-1), respectively. Average DIP fluxes increased significantly at one site from 0.06 +/- 0.01 to 0.14 +/- 0.02 mmol P m(-2) d(-1), but not at the other (from 0.06 +/- 0.01 to 0.07 +/- 0.01 mmol P m(-2) d(-1)). These results indicate that a change from highly oxic to hypoxic conditions in bottom waters may decrease DSi fluxes and increase DIP fluxes. However, sediment characteristics can lead to spatial differences in the response of DSi and DI Pfluxes to oxygen availabilit.

Place, publisher, year, edition, pages
Helsinki, Finland: Suomen Ymparistokeskus (Finnish Environment Institute) , 2018. Vol. 23, p. 159-174
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:liu:diva-154854ISI: 000458689100011OAI: oai:DiVA.org:liu-154854DiVA, id: diva2:1293678
Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-14Bibliographically approved

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Nteziryayo, Love-RaoulDanielsson, Åsa
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