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BENTHIC BOUNDARY LAYER NUTRIENT AND OXYGEN BIOGEOCHEMISTRY IN A EUTROPHIED BALTIC SEA ESTUARY

Brüchert, Volker, 1965- (author)
Stockholms universitet,Institutionen för geologiska vetenskaper
Bonaglia, Stefano (author)
Stockholms universitet,Institutionen för geologiska vetenskaper
Deutsch, Barbara (author)
Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)
 (creator_code:org_t)
2013
2013
English.
  • Conference paper (peer-reviewed)
Abstract Subject headings
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  • We present dissolved nutrient and oxygen concentrations determined with a benthic boundary layer profiling system for a set of stations along a eutrophication gradient in a Baltic Sea estuary. The sampling system yields vertically highly resolved CTD, oxygen, and nutrient profiles of the lowermost 80 cm of water overlying the sediment. Continuous oxygen and CTD measurements over 8 – 24 hours at fixed depths above the sediment surface provided information on the temporal variability of nutrients and the physical structure within the benthic boundary layer. These data indicate multiple short-term episodes of vertical mixing and stable stratification within the boundary layer that can lead to short-term fluctuations in bottom water oxygen of more than 100 µM. This high degree of temporal variability needs to be taken into account for benthic flux calculations that assume vertically mixed benthic boundary layers. 

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Keyword

Marine Geoscience
marin geovetenskap

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