scholarly journals Temporal dynamics of carbon sequestration in coastal North Atlantic fjord system as seen through dissolved organic matter characterisation

2021 ◽  
pp. 146402
Author(s):  
K. Avarachen Mathew ◽  
Murat Van Ardelan ◽  
Susana Villa Gonzalez ◽  
Olav Vadstein ◽  
S. Vezhapparambu Veena ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon Sequestration ◽  
Dissolved Organic Matter ◽  
North Atlantic ◽  
Temporal Dynamics ◽  
Fjord System

Meridional variability in dissolved organic matter stocks and diagenetic state within the euphotic and mesopelagic zone of the North Atlantic subtropical gyre

2010 ◽  
Vol 119 (1-4) ◽  
pp. 9-21 ◽  
Author(s):  
Stuart J. Goldberg ◽  
Craig A. Carlson ◽  
Brandon Bock ◽  
Norm B. Nelson ◽  
David A. Siegel
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
North Atlantic ◽  
Subtropical Gyre ◽  
The North ◽  
Mesopelagic Zone ◽  
The North Atlantic

Dissolved Organic Matter and Heterotrophic Microneuston in the Surface Microlayers of the North Atlantic

Science ◽  
1976 ◽  
Vol 194 (4272) ◽  
pp. 1415-1418 ◽  
Author(s):  
J. MCN. SIEBURTH ◽  
P.-J. WILLIS ◽  
K. M. JOHNSON ◽  
C. M. BURNEY ◽  
D. M. LAVOIE ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
North Atlantic ◽  
The North ◽  
The North Atlantic

scholarly journals Methylphosphonate Oxidation inProchlorococcusStrain MIT9301 Supports Phosphate Acquisition, Formate Excretion, and Carbon Assimilation into Purines

2019 ◽  
Vol 85 (13) ◽  
Author(s):  
Oscar A. Sosa ◽  
John R. Casey ◽  
David M. Karl
Keyword(s):  
Organic Matter ◽  
Atlantic Ocean ◽  
Dissolved Organic Matter ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Carbon Assimilation ◽  
Unicellular Cyanobacterium ◽  
Content Type ◽  
The North ◽  
Oxidative Pathway

ABSTRACTThe marine unicellular cyanobacteriumProchlorococcusis an abundant primary producer and widespread inhabitant of the photic layer in tropical and subtropical marine ecosystems, where the inorganic nutrients required for growth are limiting. In this study, we demonstrate thatProchlorococcushigh-light strain MIT9301, an isolate from the phosphate-depleted subtropical North Atlantic Ocean, can oxidize methylphosphonate (MPn) and hydroxymethylphosphonate (HMPn), two phosphonate compounds present in marine dissolved organic matter, to obtain phosphorus. The oxidation of these phosphonates releases the methyl group as formate, which is both excreted and assimilated into purines in RNA and DNA. Genes encoding the predicted phosphonate oxidative pathway of MIT9301 were predominantly present inProchlorococcusgenomes from parts of the North Atlantic Ocean where phosphate availability is typically low, suggesting that phosphonate oxidation is an ecosystem-specific adaptation of someProchlorococcuspopulations to cope with phosphate scarcity.IMPORTANCEUntil recently, MPn was only known to be degraded in the environment by the bacterial carbon-phosphorus (CP) lyase pathway, a reaction that releases the greenhouse gas methane. The identification of a formate-yielding MPn oxidative pathway in the marine planctomyceteGimesia maris(S. R. Gama, M. Vogt, T. Kalina, K. Hupp, et al., ACS Chem Biol 14:735–741, 2019,https://doi.org/10.1021/acschembio.9b00024) and the presence of this pathway inProchlorococcusindicate that this compound can follow an alternative fate in the environment while providing a valuable source of P to organisms. In the ocean, where MPn is a major component of dissolved organic matter, the oxidation of MPn to formate byProchlorococcusmay direct the flow of this one-carbon compound to carbon dioxide or assimilation into biomass, thus limiting the production of methane.

Temporal dynamics of dissolved combined neutral sugars and the quality of dissolved organic matter in the Northwestern Sargasso Sea

2009 ◽  
Vol 56 (5) ◽  
pp. 672-685 ◽  
Author(s):  
Stuart J. Goldberg ◽  
Craig A. Carlson ◽  
Dennis A. Hansell ◽  
Norm B. Nelson ◽  
David A. Siegel
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Temporal Dynamics ◽  
Sargasso Sea ◽  
Neutral Sugars

scholarly journals Effects of nitrate and phosphate supply on chromophoric and fluorescent dissolved organic matter in the Eastern Tropical North Atlantic: a mesocosm study

2015 ◽  
Vol 12 (10) ◽  
pp. 7209-7255
Author(s):  
A. N. Loginova ◽  
C. Borchard ◽  
J. Meyer ◽  
H. Hauss ◽  
R. Kiko ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Optical Properties ◽  
Amino Acid ◽  
Dissolved Organic Matter ◽  
North Atlantic ◽  
Phytoplankton Biomass ◽  
Open Ocean ◽  
Nutrient Concentrations ◽  
Tropical North Atlantic

Abstract. The Eastern Tropical North Atlantic (ETNA) is an open ocean region with little input of terrestrial dissolved organic matter (DOM), suggesting that pelagic production has to be the main source of DOM. Inorganic nitrogen (DIN) and phosphorus (DIP) concentrations affect pelagic production, leading to DOM modifications. The quantitative and qualitative changes in DOM are often estimated by its optical properties. Colored DOM (CDOM) is often used to estimate dissolved organic carbon (DOC) concentrations by applied techniques, e.g. through remote sensing, whereas DOM properties, such as molecular weight, can be estimated from the slopes of the CDOM absorption spectra (S). Fluorescence properties of CDOM (FDOM) allow discriminating between different structural CDOM properties. The investigation of distribution and cycling of CDOM and FDOM was recognized to be important for understanding of physical and biogeochemical processes, influencing DOM. However, little information is available about effects of nutrient variability on CDOM and FDOM dynamics. Here we present results from two mesocosm experiments conducted with a natural plankton community of the ETNA, where effects of DIP ("Varied P") and DIN ("Varied N") supply on optical properties of DOM were studied. CDOM accumulated proportionally to phytoplankton biomass during the experiments. S decreased over time indicating accumulation of high molecular weight DOM. In Varied N, an additional CDOM portion, as a result of bacterial DOM reworking, was determined. It increased the CDOM fraction in DOC proportionally to the supplied DIN. The humic-like FDOM component (Comp.1) was derived by bacteria proportionally to DIN supply. The bound-to-protein amino acid-like FDOM component (Comp.2) was released irrespectively to phytoplankton biomass, but depending on DIP and DIN concentrations, as a part of an overflow mechanism. Under high DIN supply, Comp.2 was removed by bacterial reworking processes, leading to an accumulation of humic-like Comp.1. No influence of nutrient availability on amino acid-like FDOM component in peptide form (Comp.3) was observed. Comp.3 potentially acted as an intermediate product during formation or degradation Comp.2. Our findings suggest that changes in nutrient concentrations may lead to substantial responses in the quantity and "quality" of optically active DOM and, therefore, might bias results of the applied techniques for an estimation of DOC concentrations in open ocean regions.

scholarly journals Linking allochthonous dissolved organic matter and boreal lake sediment carbon sequestration: The role of light-mediated flocculation

2008 ◽  
Vol 53 (6) ◽  
pp. 2416-2426 ◽  
Author(s):  
Eddie von Wachenfeldt ◽  
Sebastian Sobek ◽  
David Bastviken ◽  
Lars J. Tranvik
Keyword(s):  
Organic Matter ◽  
Carbon Sequestration ◽  
Dissolved Organic Matter ◽  
Lake Sediment ◽  
Boreal Lake ◽  
Sediment Carbon ◽  
Role Of Light

Photobleaching of fluorescent dissolved organic matter in Beaufort Sea and North Atlantic Subtropical Gyre

2015 ◽  
Vol 177 ◽  
pp. 630-637 ◽  
Author(s):  
Paul G. Dainard ◽  
Céline Guéguen ◽  
Natasha McDonald ◽  
William J. Williams
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
North Atlantic ◽  
Beaufort Sea ◽  
Subtropical Gyre ◽  
Fluorescent Dissolved Organic Matter
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