scholarly journals Seasonal phototransformation of dissolved organic matter to ammonium, dissolved inorganic carbon, and labile substrates supporting bacterial biomass across the Baltic Sea

2012 ◽  
Vol 117 (G1) ◽  
Author(s):  
Hanna Aarnos ◽  
Pasi Ylöstalo ◽  
Anssi V. Vähätalo
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Bacterial Biomass ◽  
The Baltic Sea ◽  
The Baltic

The influence of dissolved organic matter on the acid–base system of the Baltic Sea

2014 ◽  
Vol 132 ◽  
pp. 106-115 ◽  
Author(s):  
Karol Kuliński ◽  
Bernd Schneider ◽  
Karoline Hammer ◽  
Ulrike Machulik ◽  
Detlef Schulz-Bull
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
Base System ◽  
The Baltic Sea ◽  
Acid Base ◽  
The Baltic

scholarly journals Parameterization of the light absorption properties of chromophoric dissolved organic matter in the Baltic Sea and Pomeranian lakes

Ocean Science ◽  
2016 ◽  
Vol 12 (4) ◽  
pp. 1013-1032 ◽  
Author(s):  
Justyna Meler ◽  
Piotr Kowalczuk ◽  
Mirosława Ostrowska ◽  
Dariusz Ficek ◽  
Monika Zabłocka ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Absorption Coefficient ◽  
Baltic Sea ◽  
Chlorophyll A ◽  
Chromophoric Dissolved Organic Matter ◽  
The Baltic Sea ◽  
Absorption Properties ◽  
Chlorophyll A Concentration ◽  
The Baltic

Abstract. This study presents three alternative models for estimating the absorption properties of chromophoric dissolved organic matter aCDOM(λ). For this analysis we used a database containing 556 absorption spectra measured in 2006–2009 in different regions of the Baltic Sea (open and coastal waters, the Gulf of Gdańsk and the Pomeranian Bay), at river mouths, in the Szczecin Lagoon and also in three lakes in Pomerania (Poland) – Obłęskie, Łebsko and Chotkowskie. The variability range of the chromophoric dissolved organic matter (CDOM) absorption coefficient at 400 nm, aCDOM(400), lay within 0.15–8.85 m−1. The variability in aCDOM(λ) was parameterized with respect to the variability over 3 orders of magnitude in the chlorophyll a concentration Chl a (0.7–119 mg m−3). The chlorophyll a concentration and aCDOM(400) were correlated, and a statistically significant, nonlinear empirical relationship between these parameters was derived (R2 =  0.83). On the basis of the covariance between these parameters, we derived two empirical mathematical models that enabled us to design the CDOM absorption coefficient dynamics in natural waters and reconstruct the complete CDOM absorption spectrum in the UV and visible spectral domains. The input variable in the first model was the chlorophyll a concentration, and in the second one it was aCDOM(400). Both models were fitted to a power function, and a second-order polynomial function was used as the exponent. Regression coefficients for these formulas were determined for wavelengths from 240 to 700 nm at 5 nm intervals. Both approximations reflected the real shape of the absorption spectra with a low level of uncertainty. Comparison of these approximations with other models of light absorption by CDOM demonstrated that our parameterizations were superior (bias from −1.45 to 62 %, RSME from 22 to 220 %) for estimating CDOM absorption in the optically complex waters of the Baltic Sea and Pomeranian lakes.

scholarly journals Composition and Transformation of Dissolved Organic Matter in the Baltic Sea

2017 ◽  
Vol 5 ◽  
Author(s):  
Michael Seidel ◽  
Marcus Manecki ◽  
Daniel P. R. Herlemann ◽  
Barbara Deutsch ◽  
Detlef Schulz-Bull ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals Major differences in dissolved organic matter characteristics and bacterial processing over an extensive brackish water gradient, the Baltic Sea

2018 ◽  
Vol 202 ◽  
pp. 27-36 ◽  
Author(s):  
Owen F. Rowe ◽  
Julie Dinasquet ◽  
Joanna Paczkowska ◽  
Daniela Figueroa ◽  
Lasse Riemann ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
Brackish Water ◽  
The Baltic Sea ◽  
Water Gradient ◽  
The Baltic

Characterization of chromophoric dissolved organic matter (CDOM) in the Baltic Sea by excitation emission matrix fluorescence spectroscopy

2005 ◽  
Vol 96 (3-4) ◽  
pp. 273-292 ◽  
Author(s):  
Piotr Kowalczuk ◽  
Joanna Stoń-Egiert ◽  
William J. Cooper ◽  
Robert F. Whitehead ◽  
Michael J. Durako
Keyword(s):  
Organic Matter ◽  
Fluorescence Spectroscopy ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
Chromophoric Dissolved Organic Matter ◽  
The Baltic Sea ◽  
Excitation Emission Matrix ◽  
The Baltic

scholarly journals Calcification in a marginal sea – influence of seawater [Ca<sup>2+</sup>] and carbonate chemistry on bivalve shell formation

2018 ◽  
Vol 15 (5) ◽  
pp. 1469-1482 ◽  
Author(s):  
Jörn Thomsen ◽  
Kirti Ramesh ◽  
Trystan Sanders ◽  
Markus Bleich ◽  
Frank Melzner
Keyword(s):  
Baltic Sea ◽  
Environmental Conditions ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Salinity Gradient ◽  
Limiting Factors ◽  
Carbonate Chemistry ◽  
The Baltic Sea ◽  
The Baltic ◽  
Estuarine Coastal

Abstract. In estuarine coastal systems such as the Baltic Sea, mussels suffer from low salinity which limits their distribution. Anthropogenic climate change is expected to cause further desalination which will lead to local extinctions of mussels in the low saline areas. It is commonly accepted that mussel distribution is limited by osmotic stress. However, along the salinity gradient, environmental conditions for biomineralization are successively becoming more adverse as a result of reduced [Ca2+] and dissolved inorganic carbon (CT) availability. In larvae, calcification is an essential process starting during early development with formation of the prodissoconch I (PD I) shell, which is completed under optimal conditions within 2 days. Experimental manipulations of seawater [Ca2+] start to impair PD I formation in Mytilus larvae at concentrations below 3 mM, which corresponds to conditions present in the Baltic at salinities below 8 g kg−1. In addition, lowering dissolved inorganic carbon to critical concentrations (< 1 mM) similarly affected PD I size, which was well correlated with calculated ΩAragonite and [Ca2+][HCO3-] ∕ [H+] in all treatments. Comparing results for larvae from the western Baltic with a population from the central Baltic revealed a significantly higher tolerance of PD I formation to lowered [Ca2+] and [Ca2+][HCO3-] ∕ [H+] in the low saline adapted population. This may result from genetic adaptation to the more adverse environmental conditions prevailing in the low saline areas of the Baltic. The combined effects of lowered [Ca2+] and adverse carbonate chemistry represent major limiting factors for bivalve calcification and can thereby contribute to distribution limits of mussels in the Baltic Sea.

scholarly journals Effects of allochthonous dissolved organic matter input on microbial composition and nitrogen-cycling genes at two contrasting estuarine sites

2019 ◽  
Vol 95 (9) ◽  
Author(s):  
Elisabeth M Happel ◽  
Trine Markussen ◽  
Jonna E Teikari ◽  
Vimala Huchaiah ◽  
Johannes Alneberg ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
Community Composition ◽  
N Cycling ◽  
Rrna Gene ◽  
The Baltic Sea ◽  
Microbial Composition ◽  
Catchment Areas ◽  
The Baltic

ABSTRACT Heterotrophic bacteria are important drivers of nitrogen (N) cycling and the processing of dissolved organic matter (DOM). Projected increases in precipitation will potentially cause increased loads of riverine DOM to the Baltic Sea and likely affect the composition and function of bacterioplankton communities. To investigate this, the effects of riverine DOM from two different catchment areas (agricultural and forest) on natural bacterioplankton assemblages from two contrasting sites in the Baltic Sea were examined. Two microcosm experiments were carried out, where the community composition (16S rRNA gene sequencing), the composition of a suite of N-cycling genes (metagenomics) and the abundance and transcription of ammonia monooxygenase (amoA) genes involved in nitrification (quantitative PCR) were investigated. The river water treatments evoked a significant response in bacterial growth, but the effects on overall community composition and the representation of N-cycling genes were limited. Instead, treatment effects were reflected in the prevalence of specific taxonomic families, specific N-related functions and in the transcription of amoA genes. The study suggests that bacterioplankton responses to changes in the DOM pool are constrained to part of the bacterial community, whereas most taxa remain relatively unaffected.

scholarly journals Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea ecosystem

2012 ◽  
Vol 9 (11) ◽  
pp. 4465-4475 ◽  
Author(s):  
B. Deutsch ◽  
V. Alling ◽  
C. Humborg ◽  
F. Korth ◽  
C. M. Mörth
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
High Molecular Weight ◽  
Salinity Gradient ◽  
The Baltic Sea ◽  
Estuarine Mixing ◽  
The Baltic ◽  
Bothnian Bay

Abstract. To test the hypothesis whether high molecular weight dissolved organic matter (HMW-DOM) in a high latitude marginal sea is dominated by terrestrial derived matter, 10 stations were sampled along the salinity gradient of the central and northern Baltic Sea and were analyzed for concentrations of dissolved organic carbon as well as δ13C values of HMW-DOM. Different end-member-mixing models were applied to quantify the influence of terrestrial DOM and to test for conservative versus non-conservative behavior of the terrestrial DOM in the different Baltic Sea basins. The share of terrestrial DOM to the total HMW-DOM was calculated for each station, ranging from 43 to 83%. This shows the high influence of terrestrial DOM inputs for the Baltic Sea ecosystem. The data also suggest that terrestrial DOM reaching the open Baltic Sea is not subject to substantial removal anymore. However compared to riverine DOM concentrations, our results indicate that substantial amounts of HMW-DOM (> 50%) seem to be removed near the coastline during estuarine mixing. A budget approach yielded residence times for terrestrial DOM of 2.8, 3.0, and 4.5 yr for the Bothnian Bay, the Bothnian Sea and the Baltic Proper.

scholarly journals Tracing inputs of terrestrial high molecular weight dissolved organic matter within the Baltic Sea Ecosystem

2012 ◽  
Vol 9 (4) ◽  
pp. 4483-4512 ◽  
Author(s):  
B. Deutsch ◽  
V. Alling ◽  
C. Humborg ◽  
F. Korth ◽  
C. M. Mörth
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Baltic Sea ◽  
High Molecular Weight ◽  
Salinity Gradient ◽  
The Baltic Sea ◽  
Estuarine Mixing ◽  
The Baltic ◽  
Bothnian Bay

Abstract. To test the hypothesis whether dissolved organic matter (DOM) in a high latitude marginal sea is dominated by terrestrial derived matter 10 stations were sampled along the salinity gradient of the central and northern Baltic Sea and were analyzed for concentrations of dissolved organic carbon as well as δ13C values of high molecular weight DOM. Different end-member-mixing models were applied to quantify the influence of terrestrial DOM and to test for conservative versus non-conservative behavior of the terrestrial dissolved organic matter in the different Baltic Sea basins. The share of terrestrial DOM to the total DOM was calculated for each station, ranging from 43 to 83%. This shows the high influence of terrestrial DOM inputs for the Baltic Sea ecosystem. The data also suggest that terrestrial DOM that reaches the open Baltic Sea is not subject to substantial removal anymore. However compared to riverine DOM concentrations our results indicate that substantial amounts of DOM (>50%) seems to be removed near the coastline during estuarine mixing. A budget approach yielded residence times for terrestrial DOM of 2.3, 2.7, and 4.1 yr for the Bothnian Bay, the Bothnian Sea and the Baltic Proper.

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