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Are benthic fluxes important for the availability of Si in the Gulf of Finland?

Artikel i vetenskaplig tidskrift
Författare Petra Tallberg
Anna Stiina Heiskanen
Juha Niemistö
Per Hall
Jouni Lehtoranta
Publicerad i Journal of Marine Systems
Volym 171
Sidor 89-100
ISSN 0924-7963
Publiceringsår 2017
Publicerad vid Institutionen för marina vetenskaper
Sidor 89-100
Språk en
Länkar dx.doi.org/10.1016/j.jmarsys.2017.0...
Ämnesord Baltic Sea, Benthic flux, Sediment, Silicon
Ämneskategorier Kemi

Sammanfattning

© 2017 Elsevier B.V.We estimated the efflux of dissolved silicon (DSi) from sediments in the Gulf of Finland and compared it to sedimentation fluxes, burial of Si and existing data on Si loading and stocks, reassessing the reliability of existing Si budgets. Benthic fluxes of DSi measured in situ and in vitro were several times higher than estimates from diffusion calculations. The spatial variability in the open Gulf of Finland was relatively small, while both very high and low fluxes were measured from coastal areas. Fluxes were highest in late summer and lowest in early spring. In our re-assessed budget we present a new lower estimate for Si burial in the sediments, ca. 6Gmola-1 and show that more than half of the sedimentation flux of Si is released back into the water column. Changes in the efficiency of internal DSi recycling may thus affect the prevalence of siliceous phytoplankton within the ecosystem, and the diatom spring bloom may be regulated by the functioning of this internal recycling pump. We also show that the seasonal variation in benthic DSi fluxes and dissolved phosphate fluxes is similar, and that a tentative connection between hypoxia and high DSi efflux exists.

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