To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Seasonal variability of s… - University of Gothenburg, Sweden Till startsida
To content Read more about how we use cookies on

Seasonal variability of stable carbon isotopes (delta C-13(DIC)) in the Skagerrak and the Baltic Sea: Distinguishing between mixing and biological productivity

Journal article
Authors H. L. Filipsson
D. C. McCorkle
A. Mackensen
J. M. Bernhard
L. S. Andersson
L. J. Naustvoll
A. M. Caballero-Alfonso
Kjell Nordberg
D. S. Danielssen
Published in Palaeogeography Palaeoclimatology Palaeoecology
Volume 483
Pages 15-30
ISSN 0031-0182
Publication year 2017
Published at Department of marine sciences
Pages 15-30
Language en
Keywords DIC, Hypoxia, Anoxia, AOU, Estuary, Time-series, swedish west-coast, north-atlantic, gullmar fjord, benthic foraminifera, cyanobacteria blooms, deep-water, ice-age, climate, hypoxia, circulation, Physical Geography, Geology, Paleontology
Subject categories Geology


We documented the annual cycle of the carbon isotopic composition of dissolved inorganic carbon (delta C-13(DIC)) 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 delta C-13(DIC) values (-4.9%.) were found in the low -oxygen, brackish Baltic bottom water whereas the highest values (+1.8%0 were observed in the surface water of the Skagerrak during late summer. Photosynthesis drove the high delta C-13(DIC) values (between 1.0 and 1.8%.) noted in the surface waters of both the Skagerrak and the Baltic. The delta C-13(DIC) 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 delta C-13 CO2. Similarly, in the stagnant fjord basins, little deep water exchange and the degradation of terrestrial and marine organic matter set the delta C-13 composition. Deep-water renewal in the fjord basins resulted in rapid increases of the delta C-13(DIC) on the order of 1 6., whereas remineralization processes caused a decrease in delta C-13(DIC) of 0.1-03%0 per month depending on location. The combined effects of water mixing and remineralization processes (estimated using apparent oxygen utilization (AOU) values) yielded the expression: delta C-13(DIC=) 0.032 * S = 0.01 * AOU = 0.12 for the Baltic Skagerrak region at water depths below the halocline. (C) 2016 Elsevier B.V. All rights reserved.

Page Manager: Webmaster|Last update: 9/11/2012

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?