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

Kuliński, Karol; Schneider, Bernd; Hammer, Karoline; Machulik, Ulrike; Schulz–Bull, Detlef E.

doi:10.1016/j.jmarsys.2014.01.011

Cited by 107 publications

(113 citation statements)

References 34 publications

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“…metals or carbonates) which in turn seem to be a reducing factor in the final A T budget (Ge et al, 2016). Furthermore, it has been shown that in areas with restricted mixing, and/or characterized by appreciable autotrophic DOM production and/or significant inputs of DOM from land, organic bases contribute significantly to A T (Hernández-Ayón et al, 2007;Kulinski et al, 2014). Accumulation of DOM in the near-bottom layer of Elefsis Bay, which is enriched in phosphorus relatively to carbon and nitrogen, has been reported during conditions of stratification (Pavlidou et al, 2013) which could be a further contribution to the system alkalinity.…”

Section: Carbonate System Processes -Evidence Of Alkalinity Generationmentioning

confidence: 99%

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

et al. 2018

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Naturally occurring microbial decomposition of organic matter (OM) in coastal marine environments cause increased acidity in deeper layers similar or even exceeding the future predictions for global ocean acidification (OA). Experimental studies in coastal areas characterized by increased inputs of OM and nutrients, coping with intermittent hypoxic/anoxic conditions, provide better understanding of the mechanisms affecting nutrients and carbon biogeochemistry under the emerging effects of coastal pH decrease. Laboratory CO 2 -manipulated microcosm experiments were conducted using seawater and surface sediment collected from the deepest part of Elefsis Bay (Saronikos Gulf, Eastern Mediterranean) focusing to study the co-evolution of processes affected by the decline of dissolved oxygen and pH induced by (a) OM remineralization and (b) the future anthropogenic increase of atmospheric CO 2 . Under more acidified conditions, a significant increase of total alkalinity was observed partially attributed to the sedimentary carbonate dissolution and the reactive nitrogen species shift towards ammonium. Νitrate and nitrite decline, in parallel with ammonium increase, demonstrated a deceleration of ammonium oxidation processes along with decrease in nitrate production. The decreased DIN:DIP ratio, the prevalence of organic nutrient species against the inorganic ones, the observations of constrained DON degradation and nitrate production decline and the higher DOC concentrations revealed the possible inhibition of OM decomposition under lower pH values. Finally, our results highlight the need for detailed studies of the carbonate system in coastal areas dominated by hypoxic/anoxic conditions, accompanied by other biogeochemical parameters and properly designed experiments to elucidate the processes sequence or alterations due to pH reduction.

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Section: Carbonate System Processes -Evidence Of Alkalinity Generationmentioning

confidence: 99%

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

et al. 2018

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“…The contribution of the organic alkalinity to the TA may be relevant, thus leading to an underestimation of the calculated pCO 2 values using pH and TA (Ko et al, 2016). Such underestimation in the pCO 2 may vary around 30% to 50% (Kuliński et al, 2014). From the low oxygen saturation found in the Barra de Jangadas estuary, <30% throughout the year, and in the Capibaribe estuary during the dry season, as well as the high DBO 5,20 values and total phosphorus it is possible to assume that the alkalinity from dissolved organic matter probably influence the alkalinity regulation in these estuaries as has recently been discussed by Kullinsky et al (2014), Abril et al (2014) and Ko et al, (2016).…”

Section: Discussionmentioning

confidence: 99%

Alkalinity, inorganic carbon and CO2 flux variability during extreme rainfall years (2010-2011) in two polluted tropical estuaries NE Brazil

et al. 2018

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The susceptibility of coastal environments to shifts in the biogeochemical cycles of carbon and nutrients driven by anthropogenic pressure and climate change is a real challenge for the scientific community. This paper evaluated the effects of an extreme rainfall event over the nutrients and carbonate parameters in two polluted tropical estuaries. Surface water samples were taken seasonally along a salinity gradient in the Capibaribe and Barra de Jangadas estuaries in order to investigate the spatial and seasonal variability of dissolved nutrients, chlorophyll-a, dissolved oxygen, total alkalinity, inorganic carbon, partial pressure of CO 2 (pCO 2 ) and CO 2 fluxes. The increased riverine influence caused by the fluvial flooding during the extremely rainy season augmented the nitrogen concentrations in the plumes, which also presented reduced salinity, alkalinity and dissolved oxygen values. In the Capibaribe plume it has also shifted the mean CO 2 flux value of -4.01 mmolC m -2 d -1 during the dry season, to a positive mean flux of + 5.7 mmolC m -2 d -1 during the rainy season. Within the estuaries the BOD5,20 and dissolved phosphorus values were higher during the dry season (p<0.0001), they showed positive correlation with the phytoplanktonic blooms that reached a chl-a value of 85 mg m -3 in the Capibaribe. The high alkalinity found in both estuaries, with mean values between dry and wet seasons respectively from 1808 to 1373 µmol kg-1 in the Capibaribe estuary and 1616 to 1058 µmol kg-1 in Barra de Jangadas estuary, may act as a buffer to the process of coastal acidification due to eutrophication. The increased rivers discharge lead to a greater transport of organic matter and nutrients to the coast, decreasing the oxygen availability and shifting the metabolic status of the estuarine plume to heterotrophic, whereas increased the water quality within the estuaries due the flushing promoted by the extreme rainfall event. no estuário Capibaribe e 1616 a 1058 μmol kg -1 no estuário Barra de Jangadas, pode atuar como um amortecedor para o processo de acidificação costeira devido à eutrofização. O aumento da descarga dos rios levou a um maior transporte de matéria orgânica e nutrientes para o litoral, diminuindo a disponibilidade de oxigênio e deslocando o estado metabólico da pluma estuarina para heterotrófico, enquanto aumentou a qualidade da água dentro dos estuários devido ao aumento de descarga promovido pela precipitação extrema. AbstrAct resumoDescritores: Poluição antrópica, Acidificação marinha, Eutrofização, Evento extremo.

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“…(2), causes no change in A T concentration since an equivalent amount of protons have been released. It affects the internal structure of A T by changing the contributions of different A T components according to their individual dissociation constants (Cai et al, 1998;Hunt et al, 2011;Kuliński et al, 2014). The lower the pK a of an organic acid added to the system, the greater are the shifts in the internal A T distribution.…”

Section: Effect Of Organic Alkalinitymentioning

confidence: 99%

“…In the case of the carbonate alkalinity, this means a reduction in CO 2− 3 and an increase in H 2 CO 3 and thus the pCO 2 . Kuliński et al (2014) estimated the organic alkalinity (A org ) in the Baltic Sea as an excess alkalinity calculated from the difference between measured A T and that calculated from C T and pH or pCO 2 . They found A org of 25-35 µmol kg −1 in the surface Baltic Sea water (from the Arkona Basin to the Bothnian Bay) without any clear spatial distribution pattern.…”

Section: Effect Of Organic Alkalinitymentioning

confidence: 99%

“…In sensitivity studies Kuliński et al (2014) showed for the Baltic Sea that calculations concerning the CO 2 system that use measured A T may lead to significant errors if A org is ignored. Highest deviations between calculated and observed values were found when A T was used together with C T for computations of pCO 2 and pH.…”

Section: Effect Of Organic Alkalinitymentioning

confidence: 99%

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Structure and functioning of the acid–base system in the Baltic Sea

et al. 2017

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Abstract. The marine acid-base system is relatively well understood for oceanic waters. Its structure and functioning is less obvious for the coastal and shelf seas due to a number of regionally specific anomalies. In this review article we collect and integrate existing knowledge of the acid-base system in the Baltic Sea. Hydrographical and biogeochemical characteristics of the Baltic Sea, as manifested in horizontal and vertical salinity gradients, permanent stratification of the water column, eutrophication, high organic-matter concentrations and high anthropogenic pressure, make the acid-base system complex. In this study, we summarize the general knowledge of the marine acid-base system as well as describe the peculiarities identified and reported for the Baltic Sea specifically. In this context we discuss issues such as dissociation constants in brackish water, different chemical alkalinity models including contributions by organic acid-base systems, long-term changes in total alkalinity, anomalies of borate alkalinity, and the acid-base effects of biomass production and mineralization. Finally, we identify research gaps and specify limitations concerning the Baltic Sea acid-base system.

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

Cited by 107 publications

References 34 publications

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry

Alkalinity, inorganic carbon and CO2 flux variability during extreme rainfall years (2010-2011) in two polluted tropical estuaries NE Brazil

Structure and functioning of the acid–base system in the Baltic Sea

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