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SUMMARY:Vertical mixing and associated biogeochemical fluxes via radium is
 otopes - Tristan McKenzie\, Uni of Gothenberg
DTSTART:20250515T103000Z
DTEND:20250515T113000Z
UID:TALK231223@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The coastal ocean is a highly dynamic and vital biogeochemical
  mediator between land and sea. Coastal waters frequently experience poor 
 water quality derived from land-based anthropogenic pressure\, which is of
 ten attributed to surface water sources\, such as rivers. Subsurface sourc
 es (e.g.\, submarine groundwater discharge\, benthic fluxes)\, however\, o
 ften rival or exceed river contributions to coastal water and chemical bud
 gets. Yet subsurface sources are understudied because they are challenging
  to quantify.\n\nIn this talk\, I will first give a broad overview on quan
 tifying subsurface flows using U-Th series geochemical tracers (radium\, r
 adon). Then I will present an ecosystem-scale study across the Baltic Sea\
 , where we used 224Ra to quantify vertical mixing across a largely hypoxic
  deep water column. We collected radium and solute (e.g.\, dissolved silic
 ate) bottom water profiles from 50 stations along a ~5000 km cruise track 
 in the Baltic Sea. 224Ra-derived vertical mixing rates were on the order o
 f 10-4 m2/s\, well-within range of previous local-scale estimates based on
  modeling and sediment core incubations. Diffusive solute fluxes were also
  similar in magnitude to previous studies. Overall\, this talk will highli
 ght an innovative method for quantifying diffusive fluxes and contextualiz
 e findings in terms of broader biogeochemical significance.
LOCATION:Open Plan Area\, Institute for Energy and Environmental Flows\, M
 adingley Rise CB3 0EZ
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