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Helena Filipsson, foto Erik Thor

Helena Filipsson

Professor

Helena Filipsson, foto Erik Thor

Seasonal variability of stable carbon isotopes (δ13CDIC) in the Skagerrak and the Baltic Sea : Distinguishing between mixing and biological productivity

Författare

  • Helena L. Filipsson
  • Daniel C. McCorkle
  • Andreas Mackensen
  • Joan M. Bernhard
  • Lars S. Andersson
  • Lars Johan Naustvoll
  • Angela M. Caballero-Alfonso
  • Kjell Nordberg
  • Didrik S. Danielssen

Summary, in English

We documented the annual cycle of the carbon isotopic composition of dissolved inorganic carbon (δ13CDIC) in the water columns of the Skagerrak and Baltic Sea to obtain an increased understanding of the processes involved controlling the carbon isotopic distribution in shelf seas. The lowest δ13CDIC values (-4.9‰) were found in the low-oxygen, brackish Baltic bottom water whereas the highest values (+1.8‰) were observed in the surface water of the Skagerrak during late summer. Photosynthesis drove the high δ13CDIC values (between 1.0 and 1.8‰) noted in the surface waters of both the Skagerrak and the Baltic. The δ13CDIC values below the halocline in the Baltic reflect mixing of brackish water and the more saline water from the Skagerrak, and foremost organic matter remineralization processes that release significant amounts of low-δ13C CO2. Similarly, in the stagnant fjord basins, little deep water exchange and the degradation of terrestrial and marine organic matter set the δ13C composition. Deep-water renewal in the fjord basins resulted in rapid increases of the δ13CDIC on the order of 1‰, whereas remineralization processes caused a decrease in δ13CDIC of 0.1-0.3‰ per month depending on location. The combined effects of water mixing and remineralization processes (estimated using apparent oxygen utilization (AOU) values) yielded the expression: δ13CDIC =0.032*S-0.01*AOU-0.12 for the Baltic - Skagerrak region at water depths below the halocline.

Avdelning/ar

  • Geologiska institutionen
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2017-10

Språk

Engelska

Sidor

15-30

Publikation/Tidskrift/Serie

Palaeogeography, Palaeoclimatology, Palaeoecology

Volym

483

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Oceanography, Hydrology, Water Resources
  • Geosciences, Multidisciplinary

Nyckelord

  • Anoxia
  • AOU
  • DIC
  • Estuary
  • Hypoxia
  • Time-series

Status

Published

Projekt

  • Vi behöver slipa proxy verktygen - stabila isotoper med höägre prestanda för bättre paleoceanografisk modellering
  • Lund University Centre for studies of Carbon Cycle and Climate Interactions

ISBN/ISSN/Övrigt

  • ISSN: 0031-0182