36year trends in dissolved organic carbon export from Finnish rivers to the Baltic Sea

2012 ◽  
Vol 435-436 ◽  
pp. 188-201 ◽  
Author(s):  
Antti Räike ◽  
Pirkko Kortelainen ◽  
Tuija Mattsson ◽  
David N. Thomas
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Baltic Sea ◽  
The Baltic Sea ◽  
Carbon Export ◽  
The Baltic

Remineralization of terrestrial dissolved organic carbon in the Baltic Sea

2016 ◽  
Vol 181 ◽  
pp. 10-17 ◽  
Author(s):  
Karol Kuliński ◽  
Karoline Hammer ◽  
Bernd Schneider ◽  
Detlef Schulz-Bull
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Baltic Sea ◽  
The Baltic Sea ◽  
The Baltic

Future export of particulate and dissolved organic carbon from land to coastal zones of the Baltic Sea

2018 ◽  
Vol 177 ◽  
pp. 8-20 ◽  
Author(s):  
Kim Dahlgren Strååt ◽  
Carl-Magnus Mörth ◽  
Emma Undeman
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Baltic Sea ◽  
Coastal Zones ◽  
The Baltic Sea ◽  
The Baltic

Bioavailability and remineralization of sediment-derived dissolved organic carbon from the Baltic Sea depositional area

2021 ◽  
Author(s):  
Monika Lengier
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Baltic Sea ◽  
Water Column ◽  
Pore Water ◽  
Half Life ◽  
Bottom Water ◽  
The Baltic Sea ◽  
Doc Concentration ◽  
The Baltic

<p>Sediment pore waters in the depositional areas of the Baltic Sea are enriched with the dissolved organic carbon (DOC), which results in a diffusive flux of DOC to the water column. It was found that up to 30% of OM deposited in the sediments returns to the water column and may alter processes occurring there e.g. increase the oxygen demand in the bottom waters. Still little is known about the bioavailability of sediment-derived DOC and its remineralization dynamics. Thus, the aim of this study was to assess the bioavailability, degradation rate constant and half-life time of sediment-derived DOC.</p><p>Bottom water and pore water, collected during r/v Oceania cruise in March 2018 in the Gdańsk Deep, have been mixed in a volume ratio of 4:1. To ensure oxic conditions in the experiment, the mixture was bubbled with the ambient air to reach 100% O<sub>2</sub> saturation. Incubation of such prepared samples was conducted in 23±0.1°C for 126 days. At the beginning (t=0) and after 1, 2, 6, 18, 35, 73 and 126 days of the incubation the individual samples were analyzed for total dissolved organic carbon DOC. In parallel, untreated bottom water was incubated as a control, while the obtained results have been used to decouple the remineralization dynamics in the mixture.</p><p>The DOC decay had an exponential character. The highest dynamics of DOC remineralization was at the beginning of the experiment and it gradually decreased over time. During the incubation period pore water DOC concentration decreased from 1408 to 850 µmol l-<sup>1</sup><sub>,</sub> which corresponds to almost 40% loss. In the control samples (bottom water) DOC concentration decreased from 304 to 260 µmol l<sup>-1</sup> i.e. by ~14%.</p><p>In the experiment three different DOC fractions have been identified: labile DOC (DOC<sub>L</sub>), semi-labile DOC (DOC<sub>SL</sub>) and refractory DOC (DOC<sub>R</sub>). To quantify the DOC remineralization rate constants (k) and half-life times (t<sub>1/2</sub>) the first order kinetics was used. The total bioavailable fraction of pore water DOC (DOC<sub>L</sub>+DOC<sub>SL</sub>) amounted to 54%, while k and t<sub>1/2</sub> were 0.0958 d<sup>-1</sup> and 7.24 d for DOC<sub>L</sub> and 0.0082 d<sup>-1</sup> and 84.53 d for DOC<sub>SL</sub>, respectively.</p><p>This study shows that about half of sediment-derived DOC is bioavailable, which gives a new insight on the Baltic Sea carbon cycle and O­<sub>2</sub> consumption in deeper water layers.</p>

Dissolved Organic Carbon Quality and Sorption of Organic Pollutants in the Baltic Sea in Light of Future Climate Change

2015 ◽  
Vol 49 (3) ◽  
pp. 1445-1452 ◽  
Author(s):  
Matyas Ripszam ◽  
Joanna Paczkowska ◽  
João Figueira ◽  
Cathrin Veenaas ◽  
Peter Haglund
Keyword(s):  
Climate Change ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Baltic Sea ◽  
Organic Pollutants ◽  
Future Climate ◽  
Future Climate Change ◽  
The Baltic Sea ◽  
Carbon Quality ◽  
The Baltic

scholarly journals The carbon budget of the Baltic Sea

2011 ◽  
Vol 8 (11) ◽  
pp. 3219-3230 ◽  
Author(s):  
K. Kuliński ◽  
J. Pempkowiak
Keyword(s):  
Organic Carbon ◽  
Baltic Sea ◽  
Carbon Budget ◽  
The Other ◽  
Minor Importance ◽  
The Baltic Sea ◽  
Sources And Sinks ◽  
The North ◽  
The North Sea ◽  
The Baltic

Abstract. This paper presents the results of a comprehensive study of the Baltic Sea carbon budget. The Baltic Sea is very much influenced by terrestrial carbon input. Rivers are the largest carbon source, and their input amounts to 10.90 Tg C yr−1 (Tg = 1012 g) with a 37.5% contribution of organic carbon. On the other hand, carbon is effectively exported from the Baltic to the North Sea (7.67 Tg C yr−1) and is also buried in bottom sediments (2.73 Tg C yr−1). The other sources and sinks of carbon are of minor importance. The net CO2 emission (1.05 Tg C yr−1) from the Baltic to the atmosphere was calculated as the closing term of the carbon budget presented here. There is a net loss of organic carbon, which indicates that the Baltic Sea is heterotrophic.

Environmental factors affecting recent benthic foraminiferal distribution in the south-eastern Baltic Sea

Baltica ◽  
2020 ◽  
Vol 33 (1) ◽  
pp. 58-70
Author(s):  
Ekaterina Ponomarenko ◽  
Viktor Krechik ◽  
Evgenia Dorokhova
Keyword(s):  
Organic Carbon ◽  
Baltic Sea ◽  
Benthic Foraminifera ◽  
Bottom Water ◽  
Environmental Parameters ◽  
Organic Carbon Content ◽  
The South ◽  
The Baltic Sea ◽  
South Eastern ◽  
The Baltic

The Baltic Sea is characterized by a restricted exchange of deep waters due to permanent stratification of the water column. The aim of the present study is to investigate the distribution of benthic foraminifera in the south-eastern part of the Baltic Sea in relation to environmental parameters. The distribution of benthic foraminifera was analyzed in 26 surface sediment samples collected in the south-eastern part of the Baltic Sea and in the Bornholm Basin during springtime and wintertime 2016. Foraminiferal diversity in the studied region was extremely low. Agglutinated specimens dominated the assemblages and were represented by small-sized individuals which belong to Psammosphaera, Pseudothurammina, Saccammina, and Reophax genera. Calcareous foraminifera were dominated by Cribroelphidium genus. Micropaleontological data were compared to the environmental parameters characterizing bottom water (temperature, salinity, and dissolved oxygen content) and substrate conditions (grain size composition and total organic carbon content). Higher foraminiferal concentrations and diversity were found in deeper parts of the study region where fine-grained sediments with a higher total organic carbon content were accumulated under stable hydrographical conditions. Calcareous tests were found only at the stations with elevated salinity, indicating that bottom water salinity is the main factor limiting the distribution of calcareous foraminifera. On the other hand, substrate parameters and hydrodynamic conditions appear to play a major role in the distribution of agglutinated foraminifera.

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