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

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http://hdl.handle.net/10138/309474

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Tallberg , P , Heiskanen , A-S , Niemistö , J , Hall , P O J & Lehtoranta , J 2017 , ' Are benthic fluxes important for the availability of Si in the Gulf of Finland? ' , Journal of Marine Systems , vol. 171 , pp. 89-100 . https://doi.org/10.1016/j.jmarsys.2017.01.010

Title: Are benthic fluxes important for the availability of Si in the Gulf of Finland?
Author: Tallberg, Petra; Heiskanen, Anna-Stiina; Niemistö, Juha; Hall, Per O. J.; Lehtoranta, Jouni
Other contributor: University of Helsinki, Environmental Sciences
University of Helsinki, Environmental Sciences




Date: 2017-07
Language: eng
Number of pages: 12
Belongs to series: Journal of Marine Systems
ISSN: 0924-7963
DOI: https://doi.org/10.1016/j.jmarsys.2017.01.010
URI: http://hdl.handle.net/10138/309474
Abstract: 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. 6 Gmol a(-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 hypoLxia and high DSi efflux exists. (C) 2017 Elsevier B.V. All rights reserved.
Subject: Silicon
Sediment
Baltic Sea
Benthic flux
SEDIMENT-WATER INTERFACE
COASTAL BALTIC SEA
LONG-TERM TRENDS
BIOGENIC SILICA
HYDROLOGICAL ALTERATIONS
SPRING PHYTOPLANKTON
DISSOLVED SUBSTANCES
MARINE-ENVIRONMENT
EARLY DIAGENESIS
ORGANIC-CARBON
1171 Geosciences
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